总结

1、设置UILabel行间距

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NSMutableAttributedString* attrString = [[NSMutableAttributedString  alloc] initWithString:label.text];     NSMutableParagraphStyle *style = [[NSMutableParagraphStyle alloc] init];     [style setLineSpacing:20];     [attrString addAttribute:NSParagraphStyleAttributeName value:style range:NSMakeRange(0, label.text.length)];     label.attributedText = attrString;

// 或者使用xib，看下gif图

Untitled.gif

2、当使用-performSelector:withObject:withObject:afterDelay:方法时，需要传入多参数问题

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// 方法一、 // 把参数放进一个数组／字典，直接把数组／字典当成一个参数传过去，具体方法实现的地方再解析这个数组／字典 NSArray * array =      [NSArray arrayWithObjects: @"first", @"second", nil]; [self performSelector:@selector(fooFirstInput:) withObject: array afterDelay:15.0];   // 方法二、 // 使用NSInvocation SEL aSelector = NSSelectorFromString(@"doSoming:argument2:");     NSInteger argument1 = 10;     NSString *argument2 = @"argument2";     if([self respondsToSelector:aSelector]) {         NSInvocation *inv = [NSInvocation invocationWithMethodSignature:[self methodSignatureForSelector:aSelector]];         [inv setSelector:aSelector];         [inv setTarget:self];         [inv setArgument:&(argument1) atIndex:2];         [inv setArgument:&(argument2) atIndex:3];         [inv performSelector:@selector(invoke) withObject:nil afterDelay:15.0];     }

3、UILabel显示不同颜色字体

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NSMutableAttributedString * string = [[NSMutableAttributedString alloc] initWithString:label.text]; [string addAttribute:NSForegroundColorAttributeName value:[UIColor redColor] range:NSMakeRange(0,5)]; [string addAttribute:NSForegroundColorAttributeName value:[UIColor greenColor] range:NSMakeRange(5,6)]; [string addAttribute:NSForegroundColorAttributeName value:[UIColor blueColor] range:NSMakeRange(11,5)]; label.attributedText = string;

4、比较两个CGRect/CGSize/CGPoint是否相等

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if (CGRectEqualToRect(rect1, rect2)) { // 两个区域相等         // do some     }     if (CGPointEqualToPoint(point1, point2)) { // 两个点相等         // do some     }     if (CGSizeEqualToSize(size1, size2)) { // 两个size相等         // do some     }

5、比较两个NSDate相差多少小时

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NSDate* date1 = someDate;  NSDate* date2 = someOtherDate;  NSTimeInterval distanceBetweenDates = [date1 timeIntervalSinceDate:date2];  double secondsInAnHour = 3600; // 除以3600是把秒化成小时，除以60得到结果为相差的分钟数  NSInteger hoursBetweenDates = distanceBetweenDates / secondsInAnHour;

6、每个cell之间增加间距

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// 方法一，每个分区只显示一行cell，分区头当作你想要的间距(注意，从数据源数组中取值的时候需要用indexPath.section而不是indexPath.row) - (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView {     return yourArry.count; } - (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {     return 1; } -(CGFloat)tableView:(UITableView *)tableView heightForHeaderInSection:(NSInteger)section {     return cellSpacingHeight; }   // 方法二，在cell的contentView上加个稍微低一点的view，cell上原本的内容放在你的view上，而不是contentView上，这样能伪造出一个间距来。   // 方法三，自定义cell，重写setFrame：方法 - (void)setFrame:(CGRect)frame {     frame.size.height -= 20;     [super setFrame:frame]; }

7、播放一张张连续的图片

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// 加入现在有三张图片分别为animate_1、animate_2、animate_3 // 方法一     imageView.animationImages = @[[UIImage imageNamed:@"animate_1"], [UIImage imageNamed:@"animate_2"], [UIImage imageNamed:@"animate_3"]]; imageView.animationDuration = 1.0; // 方法二     imageView.image = [UIImage animatedImageNamed:@"animate_" duration:1.0]; // 方法二解释下，这个方法会加载animate_为前缀的，后边0-1024，也就是animate_0、animate_1一直到animate_1024

8、加载gif图片

推荐使用这个框架 FLAnimatedImage

9、防止离屏渲染为image添加圆角

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// image分类 - (UIImage *)circleImage { // NO代表透明 UIGraphicsBeginImageContextWithOptions(self.size, NO, 1); // 获得上下文 CGContextRef ctx = UIGraphicsGetCurrentContext(); // 添加一个圆 CGRect rect = CGRectMake(0, 0, self.size.width, self.size.height); // 方形变圆形 CGContextAddEllipseInRect(ctx, rect); // 裁剪 CGContextClip(ctx); // 将图片画上去 [self drawInRect:rect]; UIImage *image = UIGraphicsGetImageFromCurrentImageContext(); UIGraphicsEndImageContext(); return image; }

10、查看系统所有字体

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// 打印字体 for (id familyName in [UIFont familyNames]) {     NSLog(@"%@", familyName);     for (id fontName in [UIFont fontNamesForFamilyName:familyName]) NSLog(@"  %@", fontName); } // 也可以进入这个网址查看 http://iosfonts.com/

11、获取随机数

1	NSInteger i = arc4random();

12、获取随机数小数(0-1之间)

1 2	#define ARC4RANDOM_MAX      0x100000000 double val = ((double)arc4random() / ARC4RANDOM_MAX);

13、AVPlayer视频播放完成的通知监听

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[[NSNotificationCenter defaultCenter]        addObserver:self       selector:@selector(videoPlayEnd)       name:AVPlayerItemDidPlayToEndTimeNotification        object:nil];

14、判断两个rect是否有交叉

1 2	if (CGRectIntersectsRect(rect1, rect2)) { }

15、判断一个字符串是否为数字

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NSCharacterSet *notDigits = [[NSCharacterSet decimalDigitCharacterSet] invertedSet];     if ([str rangeOfCharacterFromSet:notDigits].location == NSNotFound)     {       // 是数字     } else     {       // 不是数字     }

16、将一个view保存为pdf格式

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- (void)createPDFfromUIView:(UIView*)aView saveToDocumentsWithFileName:(NSString*)aFilename {     NSMutableData *pdfData = [NSMutableData data];     UIGraphicsBeginPDFContextToData(pdfData, aView.bounds, nil);     UIGraphicsBeginPDFPage();     CGContextRef pdfContext = UIGraphicsGetCurrentContext();     [aView.layer renderInContext:pdfContext];     UIGraphicsEndPDFContext();       NSArray* documentDirectories = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask,YES);     NSString* documentDirectory = [documentDirectories objectAtIndex:0];     NSString* documentDirectoryFilename = [documentDirectory stringByAppendingPathComponent:aFilename];     [pdfData writeToFile:documentDirectoryFilename atomically:YES];     NSLog(@"documentDirectoryFileName: %@",documentDirectoryFilename); }

17、让一个view在父视图中心

1	child.center = [parent convertPoint:parent.center fromView:parent.superview];

18、获取当前导航控制器下前一个控制器

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- (UIViewController *)backViewController {     NSInteger myIndex = [self.navigationController.viewControllers indexOfObject:self];       if ( myIndex != 0 && myIndex != NSNotFound ) {         return [self.navigationController.viewControllers objectAtIndex:myIndex-1];     } else {         return nil;     } }

19、保存UIImage到本地

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NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES); NSString *filePath = [[paths objectAtIndex:0] stringByAppendingPathComponent:@"Image.png"];   [UIImagePNGRepresentation(image) writeToFile:filePath atomically:YES];

20、键盘上方增加工具栏

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UIToolbar *keyboardDoneButtonView = [[UIToolbar alloc] init]; [keyboardDoneButtonView sizeToFit]; UIBarButtonItem *doneButton = [[UIBarButtonItem alloc] initWithTitle:@"Done"                                                                style:UIBarButtonItemStyleBordered target:self                                                               action:@selector(doneClicked:)]; [keyboardDoneButtonView setItems:[NSArray arrayWithObjects:doneButton, nil]]; txtField.inputAccessoryView = keyboardDoneButtonView;

21、copy一个view

因为UIView没有实现copy协议，因此找不到copyWithZone方法，使用copy的时候导致崩溃

但是我们可以通过归档再解档实现copy，这相当于对视图进行了一次深拷贝，代码如下

1 2	id copyOfView =  [NSKeyedUnarchiver unarchiveObjectWithData:[NSKeyedArchiver archivedDataWithRootObject:originalView]];

22、在image上绘制文字并生成新的image

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UIFont *font = [UIFont boldSystemFontOfSize:12];     UIGraphicsBeginImageContext(image.size);     [image drawInRect:CGRectMake(0,0,image.size.width,image.size.height)];     CGRect rect = CGRectMake(point.x, point.y, image.size.width, image.size.height);     [[UIColor whiteColor] set];     [text drawInRect:CGRectIntegral(rect) withFont:font];      UIImage *newImage = UIGraphicsGetImageFromCurrentImageContext();     UIGraphicsEndImageContext();

23、判断一个view是否为另一个view的子视图

1 2	// 如果myView是self.view本身，也会返回yes BOOL isSubView = [myView isDescendantOfView:self.view];

24、判断一个字符串是否包含另一个字符串

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// 方法一、这种方法只适用于iOS8之后，如果是配iOS8之前用方法二 if ([str containsString:otherStr]) NSLog(@"包含");   // 方法二 NSRange range = [str rangeOfString:otherStr]; if (range.location != NSNotFound) NSLog(@"包含");

25、UICollectionView自动滚动到某行

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// 重写viewDidLayoutSubviews方法 -(void)viewDidLayoutSubviews {    [super viewDidLayoutSubviews];    [self.collectionView scrollToItemAtIndexPath:indexPath atScrollPosition:UICollectionViewScrollPositionCenteredVertically animated:NO]; }

26、修改系统UIAlertController

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// 但是据说这种方法会被App Store拒绝(慎用！) UIAlertController *alertVC = [UIAlertController alertControllerWithTitle:@"" message:@"" preferredStyle:UIAlertControllerStyleActionSheet];     NSMutableAttributedString *hogan = [[NSMutableAttributedString alloc] initWithString:@"我是一个大文本"];     [hogan addAttribute:NSFontAttributeName                   value:[UIFont systemFontOfSize:30]                   range:NSMakeRange(4, 1)];     [hogan addAttribute:NSForegroundColorAttributeName                   value:[UIColor redColor]                   range:NSMakeRange(4, 1)];     [alertVC setValue:hogan forKey:@"attributedTitle"];       UIAlertAction *button = [UIAlertAction actionWithTitle:@"Label text" style:UIAlertActionStyleDefault handler:^(UIAlertAction *action){ }];     UIImage *accessoryImage = [UIImage imageNamed:@"1"];     [button setValue:accessoryImage forKey:@"image"];     [alertVC addAction:button];     [self presentViewController:alertVC animated:YES completion:nil];

27、判断某一行的cell是否已经显示

1 2	CGRect cellRect = [tableView rectForRowAtIndexPath:indexPath]; BOOL completelyVisible = CGRectContainsRect(tableView.bounds, cellRect);

28、让导航控制器pop回指定的控制器

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NSMutableArray *allViewControllers = [NSMutableArray arrayWithArray:[self.navigationController viewControllers]]; for (UIViewController *aViewController in allViewControllers) {     if ([aViewController isKindOfClass:[RequiredViewController class]]) {         [self.navigationController popToViewController:aViewController animated:NO];     } }

29、动画修改label上的文字

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// 方法一 CATransition *animation = [CATransition animation];     animation.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut];     animation.type = kCATransitionFade;     animation.duration = 0.75;     [self.label.layer addAnimation:animation forKey:@"kCATransitionFade"];     self.label.text = @"New";   // 方法二 [UIView transitionWithView:self.label                       duration:0.25f                        options:UIViewAnimationOptionTransitionCrossDissolve                     animations:^{                         self.label.text = @"Well done!";                     } completion:nil];   // 方法三 [UIView animateWithDuration:1.0                      animations:^{                          self.label.alpha = 0.0f;                          self.label.text = @"newText";                          self.label.alpha = 1.0f;                      }];

30、判断字典中是否包含某个key值

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if ([dic objectForKey:@"yourKey"]) {     NSLog(@"有这个值"); } else {     NSLog(@"没有这个值"); }

31、获取屏幕方向

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UIInterfaceOrientation orientation = [UIApplication sharedApplication].statusBarOrientation;   if(orientation == 0) //Default orientation      //默认 else if(orientation == UIInterfaceOrientationPortrait)     //竖屏 else if(orientation == UIInterfaceOrientationLandscapeLeft)     // 左横屏 else if(orientation == UIInterfaceOrientationLandscapeRight)     //右横屏

32、设置UIImage的透明度

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// 方法一、添加UIImage分类 - (UIImage *)imageByApplyingAlpha:(CGFloat) alpha {     UIGraphicsBeginImageContextWithOptions(self.size, NO, 0.0f);       CGContextRef ctx = UIGraphicsGetCurrentContext();     CGRect area = CGRectMake(0, 0, self.size.width, self.size.height);       CGContextScaleCTM(ctx, 1, -1);     CGContextTranslateCTM(ctx, 0, -area.size.height);       CGContextSetBlendMode(ctx, kCGBlendModeMultiply);       CGContextSetAlpha(ctx, alpha);       CGContextDrawImage(ctx, area, self.CGImage);       UIImage *newImage = UIGraphicsGetImageFromCurrentImageContext();       UIGraphicsEndImageContext();       return newImage; }   // 方法二、如果没有奇葩需求，干脆用UIImageView设置透明度 UIImageView *imageView = [[UIImageView alloc] initWithImage:[UIImage imageWithName:@"yourImage"]]; imageView.alpha = 0.5;

33、Attempt to mutate immutable object with insertString:atIndex:

这个错是因为你拿字符串调用insertString:atIndex:方法的时候，调用对象不是NSMutableString，应该先转成这个类型再调用

34、UIWebView添加单击手势不响应

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UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(webViewClick)];         tap.delegate = self;         [_webView addGestureRecognizer:tap];   // 因为webView本身有一个单击手势，所以再添加会造成手势冲突，从而不响应。需要绑定手势代理，并实现下边的代理方法 - (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer{     return YES; }

35、获取手机RAM容量

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// 需要导入#import mach_port_t host_port;     mach_msg_type_number_t host_size;     vm_size_t pagesize;       host_port = mach_host_self();     host_size = sizeof(vm_statistics_data_t) / sizeof(integer_t);     host_page_size(host_port, &pagesize);       vm_statistics_data_t vm_stat;       if (host_statistics(host_port, HOST_VM_INFO, (host_info_t)&vm_stat, &host_size) != KERN_SUCCESS) {         NSLog(@"Failed to fetch vm statistics");     }       /* Stats in bytes */     natural_t mem_used = (vm_stat.active_count +                           vm_stat.inactive_count +                           vm_stat.wire_count) * pagesize;     natural_t mem_free = vm_stat.free_count * pagesize;     natural_t mem_total = mem_used + mem_free;     NSLog(@"已用: %u 可用: %u 总共: %u", mem_used, mem_free, mem_total);

36、地图上两个点之间的实际距离

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// 需要导入#import CLLocation *locA = [[CLLocation alloc] initWithLatitude:34 longitude:113];     CLLocation *locB = [[CLLocation alloc] initWithLatitude:31.05 longitude:121.76]; // CLLocationDistance求出的单位为米     CLLocationDistance distance = [locA distanceFromLocation:locB];

37、在应用中打开设置的某个界面

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// 打开设置->通用 [[UIApplication sharedApplication] openURL:[NSURL URLWithString:@"prefs:root=General"]];   // 以下是设置其他界面 prefs:root=General&path=About prefs:root=General&path=ACCESSIBILITY prefs:root=AIRPLANE_MODE prefs:root=General&path=AUTOLOCK prefs:root=General&path=USAGE/CELLULAR_USAGE prefs:root=Brightness prefs:root=Bluetooth prefs:root=General&path=DATE_AND_TIME prefs:root=FACETIME prefs:root=General prefs:root=General&path=Keyboard prefs:root=CASTLE prefs:root=CASTLE&path=STORAGE_AND_BACKUP prefs:root=General&path=INTERNATIONAL prefs:root=LOCATION_SERVICES prefs:root=ACCOUNT_SETTINGS prefs:root=MUSIC prefs:root=MUSIC&path=EQ prefs:root=MUSIC&path=VolumeLimit prefs:root=General&path=Network prefs:root=NIKE_PLUS_IPOD prefs:root=NOTES prefs:root=NOTIFICATIONS_ID prefs:root=Phone prefs:root=Photos prefs:root=General&path=ManagedConfigurationList prefs:root=General&path=Reset prefs:root=Sounds&path=Ringtone prefs:root=Safari prefs:root=General&path=Assistant prefs:root=Sounds prefs:root=General&path=SOFTWARE_UPDATE_LINK prefs:root=STORE prefs:root=TWITTER prefs:root=FACEBOOK prefs:root=General&path=USAGE prefs:root=VIDEO prefs:root=General&path=Network/VPN prefs:root=Wallpaper prefs:root=WIFI prefs:root=INTERNET_TETHERING prefs:root=Phone&path=Blocked prefs:root=DO_NOT_DISTURB

38、在UITextView中显示html文本

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UITextView *textView = [[UITextView alloc] initWithFrame:CGRectMake(20, 30, 100, 199)];     textView.backgroundColor = [UIColor redColor];     [self.view addSubview:textView];     NSString *htmlString = @" ";     NSAttributedString *attributedString = [[NSAttributedString alloc] initWithData: [htmlString dataUsingEncoding:NSUnicodeStringEncoding] options: @{ NSDocumentTypeDocumentAttribute: NSHTMLTextDocumentType } documentAttributes: nil error: nil];     textView.attributedText = attributedString;

39、监听scrollView是否滚动到了顶部／底部

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-(void)scrollViewDidScroll: (UIScrollView*)scrollView {     float scrollViewHeight = scrollView.frame.size.height;     float scrollContentSizeHeight = scrollView.contentSize.height;     float scrollOffset = scrollView.contentOffset.y;       if (scrollOffset == 0)     {         // 滚动到了顶部     }     else if (scrollOffset + scrollViewHeight == scrollContentSizeHeight)     {         // 滚动到了底部     } }

40、UISlider增量／减量为固定值(假如为5)

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- (void)setupSlider {     UISlider *slider = [[UISlider alloc] init];     [self.view addSubview:slider];     [slider addTarget:self action:@selector(sliderAction:) forControlEvents:UIControlEventValueChanged];     slider.maximumValue = 100;     slider.minimumValue = 0;     slider.frame = CGRectMake(200, 20, 100, 30); }   - (void)sliderAction:(UISlider *)slider {     [slider setValue:((int)((slider.value + 2.5) / 5) * 5) animated:NO]; }

41、选中textField或者textView所有文本(我这里以textView为例)

1	[self.textView setSelectedTextRange:[self.textView textRangeFromPosition:self.textView.beginningOfDocument toPosition:self.textView.endOfDocument]]

42、从导航控制器中删除某个控制器

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// 方法一、知道这个控制器所处的导航控制器下标 NSMutableArray *navigationArray = [[NSMutableArray alloc] initWithArray: self.navigationController.viewControllers]; [navigationArray removeObjectAtIndex: 2];  self.navigationController.viewControllers = navigationArray;   // 方法二、知道具体是哪个控制器 NSArray* tempVCA = [self.navigationController viewControllers];   for(UIViewController *tempVC in tempVCA) {     if([tempVC isKindOfClass:[urViewControllerClass class]])     {         [tempVC removeFromParentViewController];     } }

43、隐藏UITextView/UITextField光标

1	textField.tintColor = [UIColor clearColor];

44、当UITextView/UITextField中没有文字时，禁用回车键

1	textField.enablesReturnKeyAutomatically = YES;

45、字符串encode编码(编码url字符串不成功的问题)

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// 我们一般用这个方法处理stringByAddingPercentEscapesUsingEncoding但是这个方法好想不会处理／和&这种特殊符号，这种情况就需要用下边这个方法处理 @implementation NSString (NSString_Extended) - (NSString *)urlencode {     NSMutableString *output = [NSMutableString string];     const unsigned char *source = (const unsigned char *)[self UTF8String];     int sourceLen = strlen((const char *)source);     for (int i = 0; i < sourceLen; ++i) {         const unsigned char thisChar = source[i];         if (thisChar == ' '){             [output appendString:@"+"];         } else if (thisChar == '.' || thisChar == '-' || thisChar == '_' || thisChar == '~' ||                     (thisChar >= 'a' && thisChar = 'A' && thisChar = '0' && thisChar <= '9')) {             [output appendFormat:@"%c", thisChar];         } else {             [output appendFormat:@"%%X", thisChar];         }     }     return output; }

46、计算UILabel上某段文字的frame

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@implementation UILabel (TextRect)   - (CGRect)boundingRectForCharacterRange:(NSRange)range {     NSTextStorage *textStorage = [[NSTextStorage alloc] initWithAttributedString:[self attributedText]];     NSLayoutManager *layoutManager = [[NSLayoutManager alloc] init];     [textStorage addLayoutManager:layoutManager];     NSTextContainer *textContainer = [[NSTextContainer alloc] initWithSize:[self bounds].size];     textContainer.lineFragmentPadding = 0;     [layoutManager addTextContainer:textContainer];     NSRange glyphRange;     [layoutManager characterRangeForGlyphRange:range actualGlyphRange:&glyphRange];     return [layoutManager boundingRectForGlyphRange:glyphRange inTextContainer:textContainer]; }

47、获取随机UUID

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NSString *result;     if([[[UIDevice currentDevice] systemVersion] floatValue] > 6.0)     {        result = [[NSUUID UUID] UUIDString];     }     else     {         CFUUIDRef uuidRef = CFUUIDCreate(NULL);         CFStringRef uuid = CFUUIDCreateString(NULL, uuidRef);         CFRelease(uuidRef);         result = (__bridge_transfer NSString *)uuid;     }

48、仿苹果抖动动画

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#define RADIANS(degrees) (((degrees) * M_PI) / 180.0)   - (void)startAnimate {     view.transform = CGAffineTransformRotate(CGAffineTransformIdentity, RADIANS(-5));     [UIView animateWithDuration:0.25 delay:0.0 options:(UIViewAnimationOptionAllowUserInteraction | UIViewAnimationOptionRepeat | UIViewAnimationOptionAutoreverse) animations:^ {                          view.transform = CGAffineTransformRotate(CGAffineTransformIdentity, RADIANS(5));                      } completion:nil]; }   - (void)stopAnimate {     [UIView animateWithDuration:0.25 delay:0.0 options:(UIViewAnimationOptionAllowUserInteraction | UIViewAnimationOptionBeginFromCurrentState | UIViewAnimationOptionCurveLinear) animations:^ {                          view.transform = CGAffineTransformIdentity;                      } completion:nil]; }

49、修改UISearBar内部背景颜色

1 2	UITextField *textField = [_searchBar valueForKey:@"_searchField"]; textField.backgroundColor = [UIColor redColor];

50、UITextView滚动到顶部

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// 方法一     [self.textView scrollRangeToVisible:NSMakeRange(0, 0)];     // 方法二     [self.textView setContentOffset:CGPointZero animated:YES];

51、通知监听APP生命周期

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UIApplicationDidEnterBackgroundNotification 应用程序进入后台 UIApplicationWillEnterForegroundNotification 应用程序将要进入前台 UIApplicationDidFinishLaunchingNotification 应用程序完成启动 UIApplicationDidFinishLaunchingNotification 应用程序由挂起变的活跃 UIApplicationWillResignActiveNotification 应用程序挂起(有电话进来或者锁屏) UIApplicationDidReceiveMemoryWarningNotification 应用程序收到内存警告 UIApplicationDidReceiveMemoryWarningNotification 应用程序终止(后台杀死、手机关机等) UIApplicationSignificantTimeChangeNotification 当有重大时间改变(凌晨0点，设备时间被修改，时区改变等) UIApplicationWillChangeStatusBarOrientationNotification 设备方向将要改变 UIApplicationDidChangeStatusBarOrientationNotification 设备方向改变 UIApplicationWillChangeStatusBarFrameNotification 设备状态栏frame将要改变 UIApplicationDidChangeStatusBarFrameNotification 设备状态栏frame改变 UIApplicationBackgroundRefreshStatusDidChangeNotification 应用程序在后台下载内容的状态发生变化 UIApplicationProtectedDataWillBecomeUnavailable 本地受保护的文件被锁定,无法访问 UIApplicationProtectedDataWillBecomeUnavailable 本地受保护的文件可用了

52、触摸事件类型

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UIControlEventTouchCancel 取消控件当前触发的事件 UIControlEventTouchDown 点按下去的事件 UIControlEventTouchDownRepeat 重复的触动事件 UIControlEventTouchDragEnter 手指被拖动到控件的边界的事件 UIControlEventTouchDragExit 一个手指从控件内拖到外界的事件 UIControlEventTouchDragInside 手指在控件的边界内拖动的事件 UIControlEventTouchDragOutside 手指在控件边界之外被拖动的事件 UIControlEventTouchUpInside 手指处于控制范围内的触摸事件 UIControlEventTouchUpOutside 手指超出控制范围的控制中的触摸事件

53、UITextField文字周围增加边距

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// 子类化UITextField，增加insert属性 @interface WZBTextField : UITextField @property (nonatomic, assign) UIEdgeInsets insets; @end   // 在.m文件重写下列方法 - (CGRect)textRectForBounds:(CGRect)bounds {     CGRect paddedRect = UIEdgeInsetsInsetRect(bounds, self.insets);     if (self.rightViewMode == UITextFieldViewModeAlways || self.rightViewMode == UITextFieldViewModeUnlessEditing) {         return [self adjustRectWithWidthRightView:paddedRect];     }     return paddedRect; }   - (CGRect)placeholderRectForBounds:(CGRect)bounds {     CGRect paddedRect = UIEdgeInsetsInsetRect(bounds, self.insets);       if (self.rightViewMode == UITextFieldViewModeAlways || self.rightViewMode == UITextFieldViewModeUnlessEditing) {         return [self adjustRectWithWidthRightView:paddedRect];     }     return paddedRect; }   - (CGRect)editingRectForBounds:(CGRect)bounds {     CGRect paddedRect = UIEdgeInsetsInsetRect(bounds, self.insets);     if (self.rightViewMode == UITextFieldViewModeAlways || self.rightViewMode == UITextFieldViewModeWhileEditing) {         return [self adjustRectWithWidthRightView:paddedRect];     }     return paddedRect; }   - (CGRect)adjustRectWithWidthRightView:(CGRect)bounds {     CGRect paddedRect = bounds;     paddedRect.size.width -= CGRectGetWidth(self.rightView.frame);       return paddedRect; }

54、监听UISlider拖动状态

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// 添加事件 [slider addTarget:self action:@selector(sliderValurChanged:forEvent:) forControlEvents:UIControlEventValueChanged];   // 实现方法 - (void)sliderValurChanged:(UISlider*)slider forEvent:(UIEvent*)event {     UITouch *touchEvent = [[event allTouches] anyObject];     switch (touchEvent.phase) {         case UITouchPhaseBegan:             NSLog(@"开始拖动");             break;         case UITouchPhaseMoved:             NSLog(@"正在拖动");             break;         case UITouchPhaseEnded:             NSLog(@"结束拖动");             break;         default:             break;     } }

55、设置UITextField光标位置

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// textField需要设置的textField，index要设置的光标位置 - (void)cursorLocation:(UITextField *)textField index:(NSInteger)index {     NSRange range = NSMakeRange(index, 0);     UITextPosition *start = [textField positionFromPosition:[textField beginningOfDocument] offset:range.location];     UITextPosition *end = [textField positionFromPosition:start offset:range.length];     [textField setSelectedTextRange:[textField textRangeFromPosition:start toPosition:end]]; }

56、去除webView底部黑色

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[webView setBackgroundColor:[UIColor clearColor]];     [webView setOpaque:NO];       for (UIView *v1 in [webView subviews])     {         if ([v1 isKindOfClass:[UIScrollView class]])         {             for (UIView *v2 in v1.subviews)             {                 if ([v2 isKindOfClass:[UIImageView class]])                 {                     v2.hidden = YES;                 }             }         }     }

57、获取collectionViewCell在屏幕中的frame

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UICollectionViewLayoutAttributes *attributes = [collectionView layoutAttributesForItemAtIndexPath:indexPath]; CGRect cellRect = attributes.frame; CGRect cellFrameInSuperview = [collectionView convertRect:cellRect toView:[cv superview]];

58、比较两个UIImage是否相等

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- (BOOL)image:(UIImage *)image1 isEqualTo:(UIImage *)image2 {     NSData *data1 = UIImagePNGRepresentation(image1);     NSData *data2 = UIImagePNGRepresentation(image2);       return [data1 isEqual:data2]; }

59、解决当UIScrollView上有UIButton的时候，触摸到button滑动不了的问题

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// 子类化UIScrollView，并重写以下方法 - (instancetype)initWithFrame:(CGRect)frame {     if (self = [super initWithFrame:frame]) {         self.delaysContentTouches = NO;     }       return self; }   - (BOOL)touchesShouldCancelInContentView:(UIView *)view {     if ([view isKindOfClass:UIButton.class]) {         return YES;     }       return [super touchesShouldCancelInContentView:view]; }

60、UITextView中的文字添加阴影效果

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- (void)setTextLayer:(UITextView *)textView color:(UIColor *)color {     CALayer *textLayer = ((CALayer *)[textView.layer.sublayers objectAtIndex:0]);     textLayer.shadowColor = color.CGColor;     textLayer.shadowOffset = CGSizeMake(0.0f, 1.0f);     textLayer.shadowOpacity = 1.0f;     textLayer.shadowRadius = 1.0f; }

61、MD5加密

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+ (NSString *)md5:(NSString *)str {     const char *concat_str = [str UTF8String];     unsigned char result[CC_MD5_DIGEST_LENGTH];     CC_MD5(concat_str, (unsigned int)strlen(concat_str), result);     NSMutableString *hash = [NSMutableString string];     for (int i =0; i<16; i++){         [hash appendFormat:@"X", result[i]];     }     return [hash uppercaseString]; }

62、base64加密

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@interface NSData (Base64) /**  *  @brief  字符串base64后转data  */ + (NSData *)dataWithBase64EncodedString:(NSString *)string {     if (![string length]) return nil;     NSData *decoded = nil; #if __MAC_OS_X_VERSION_MIN_REQUIRED < __MAC_10_9 || __IPHONE_OS_VERSION_MIN_REQUIRED < __IPHONE_7_0     if (![NSData instancesRespondToSelector:@selector(initWithBase64EncodedString:options:)])     { #pragma clang diagnostic push #pragma clang diagnostic ignored "-Wdeprecated-declarations"         decoded = [[self alloc] initWithBase64Encoding:[string stringByReplacingOccurrencesOfString:@"[^A-Za-z0-9+/=]" withString:@"" options:NSRegularExpressionSearch range:NSMakeRange(0, [string length])]]; #pragma clang diagnostic pop     }     else #endif     {         decoded = [[self alloc] initWithBase64EncodedString:string options:NSDataBase64DecodingIgnoreUnknownCharacters];     }     return [decoded length]? decoded: nil; } /**  *  @brief  NSData转string  *  @param wrapWidth 换行长度  76  64  */ - (NSString *)base64EncodedStringWithWrapWidth:(NSUInteger)wrapWidth {     if (![self length]) return nil;     NSString *encoded = nil; #if __MAC_OS_X_VERSION_MIN_REQUIRED < __MAC_10_9 || __IPHONE_OS_VERSION_MIN_REQUIRED < __IPHONE_7_0     if (![NSData instancesRespondToSelector:@selector(base64EncodedStringWithOptions:)])     { #pragma clang diagnostic push #pragma clang diagnostic ignored "-Wdeprecated-declarations"         encoded = [self base64Encoding]; #pragma clang diagnostic pop       }     else #endif     {         switch (wrapWidth)         {             case 64:             {                 return [self base64EncodedStringWithOptions:NSDataBase64Encoding64CharacterLineLength];             }             case 76:             {                 return [self base64EncodedStringWithOptions:NSDataBase64Encoding76CharacterLineLength];             }             default:             {                 encoded = [self base64EncodedStringWithOptions:(NSDataBase64EncodingOptions)0];             }         }     }     if (!wrapWidth || wrapWidth >= [encoded length])     {         return encoded;     }     wrapWidth = (wrapWidth / 4) * 4;     NSMutableString *result = [NSMutableString string];     for (NSUInteger i = 0; i < [encoded length]; i+= wrapWidth)     {         if (i + wrapWidth >= [encoded length])         {             [result appendString:[encoded substringFromIndex:i]];             break;         }         [result appendString:[encoded substringWithRange:NSMakeRange(i, wrapWidth)]];         [result appendString:@" "];     }     return result; } /**  *  @brief  NSData转string 换行长度默认64  */ - (NSString *)base64EncodedString {     return [self base64EncodedStringWithWrapWidth:0]; }

63、AES加密

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#import @interface NSData (AES) /**  *  利用AES加密数据  */ - (NSData*)encryptedWithAESUsingKey:(NSString*)key andIV:(NSData*)iv {       NSData *keyData = [key dataUsingEncoding:NSUTF8StringEncoding];       size_t dataMoved;     NSMutableData *encryptedData = [NSMutableData dataWithLength:self.length + kCCBlockSizeAES128];       CCCryptorStatus status = CCCrypt(kCCEncrypt,kCCAlgorithmAES128,kCCOptionPKCS7Padding,keyData.bytes,keyData.length,iv.bytes,self.bytes,self.length,encryptedData.mutableBytes, encryptedData.length,&dataMoved);       if (status == kCCSuccess) {         encryptedData.length = dataMoved;         return encryptedData;     }       return nil; }   /**  *  @brief  利用AES解密据  */ - (NSData*)decryptedWithAESUsingKey:(NSString*)key andIV:(NSData*)iv {       NSData *keyData = [key dataUsingEncoding:NSUTF8StringEncoding];       size_t dataMoved;     NSMutableData *decryptedData = [NSMutableData dataWithLength:self.length + kCCBlockSizeAES128];       CCCryptorStatus result = CCCrypt(kCCDecrypt,kCCAlgorithmAES128,kCCOptionPKCS7Padding,keyData.bytes,keyData.length,iv.bytes,self.bytes,self.length,decryptedData.mutableBytes, decryptedData.length,&dataMoved);       if (result == kCCSuccess) {         decryptedData.length = dataMoved;         return decryptedData;     }       return nil;   }

64、3DES加密

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#import @interface NSData (3DES) /**  *  利用3DES加密数据  */ - (NSData*)encryptedWith3DESUsingKey:(NSString*)key andIV:(NSData*)iv {       NSData *keyData = [key dataUsingEncoding:NSUTF8StringEncoding];       size_t dataMoved;     NSMutableData *encryptedData = [NSMutableData dataWithLength:self.length + kCCBlockSize3DES];       CCCryptorStatus result = CCCrypt(kCCEncrypt,kCCAlgorithm3DES,kCCOptionPKCS7Padding,keyData.bytes,keyData.length,iv.bytes,self.bytes,self.length,encryptedData.mutableBytes,encryptedData.length,&dataMoved);       if (result == kCCSuccess) {         encryptedData.length = dataMoved;         return encryptedData;     }       return nil;   } /**  *  @brief   利用3DES解密数据  */ - (NSData*)decryptedWith3DESUsingKey:(NSString*)key andIV:(NSData*)iv {       NSData *keyData = [key dataUsingEncoding:NSUTF8StringEncoding];       size_t dataMoved;     NSMutableData *decryptedData = [NSMutableData dataWithLength:self.length + kCCBlockSize3DES];       CCCryptorStatus result = CCCrypt(kCCDecrypt,kCCAlgorithm3DES,kCCOptionPKCS7Padding,keyData.bytes,keyData.length,iv.bytes,self.bytes,self.length,decryptedData.mutableBytes,decryptedData.length,&dataMoved);       if (result == kCCSuccess) {         decryptedData.length = dataMoved;         return decryptedData;     }       return nil;   }

65、单个页面多个网络请求的情况，需要监听所有网络请求结束后刷新UI

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dispatch_group_t group = dispatch_group_create();     dispatch_queue_t serialQueue = dispatch_queue_create("com.wzb.test.www", DISPATCH_QUEUE_SERIAL);     dispatch_group_enter(group);     dispatch_group_async(group, serialQueue, ^{         // 网络请求一         [WebClick getDataSuccess:^(ResponseModel *model) {             dispatch_group_leave(group);         } failure:^(NSString *err) {             dispatch_group_leave(group);         }];     });     dispatch_group_enter(group);     dispatch_group_async(group, serialQueue, ^{         // 网络请求二         [WebClick getDataSuccess:getBigTypeRM onSuccess:^(ResponseModel *model) {             dispatch_group_leave(group);         }                                  failure:^(NSString *errorString) {             dispatch_group_leave(group);         }];     });     dispatch_group_enter(group);     dispatch_group_async(group, serialQueue, ^{         // 网络请求三         [WebClick getDataSuccess:^{             dispatch_group_leave(group);         } failure:^(NSString *errorString) {             dispatch_group_leave(group);         }];     });       // 所有网络请求结束后会来到这个方法     dispatch_group_notify(group, serialQueue, ^{         dispatch_async(dispatch_get_global_queue(0, 0), ^{             dispatch_async(dispatch_get_main_queue(), ^{                 // 刷新UI             });         });     });

66、解决openUrl延时问题

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// 方法一 dispatch_async(dispatch_get_main_queue(), ^{       UIApplication *application = [UIApplication sharedApplication];     if ([application respondsToSelector:@selector(openURL:options:completionHandler:)]) {         [application openURL:URL options:@{}            completionHandler:nil];     } else {         [application openURL:URL];     }     }); // 方法二 [self performSelector:@selector(redirectToURL:) withObject:url afterDelay:0.1];   - (void) redirectToURL { UIApplication *application = [UIApplication sharedApplication];     if ([application respondsToSelector:@selector(openURL:options:completionHandler:)]) {         [application openURL:URL options:@{}            completionHandler:nil];     } else {         [application openURL:URL];     } }

67、页面跳转实现翻转动画

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// modal方式     TestViewController *vc = [[TestViewController alloc] init];     vc.view.backgroundColor = [UIColor redColor];     vc.modalTransitionStyle = UIModalTransitionStyleCoverVertical;     [self presentViewController:vc animated:YES completion:nil];   // push方式     TestViewController *vc = [[TestViewController alloc] init];     vc.view.backgroundColor = [UIColor redColor];     [UIView beginAnimations:@"View Flip" context:nil];     [UIView setAnimationDuration:0.80];     [UIView setAnimationCurve:UIViewAnimationCurveEaseInOut];     [UIView setAnimationTransition:UIViewAnimationTransitionFlipFromRight forView:self.navigationController.view cache:NO];     [self.navigationController pushViewController:vc animated:YES];     [UIView commitAnimations];

68、tableView实现无限滚动

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- (void)scrollViewDidScroll:(UIScrollView *)scrollView {     CGFloat actualPosition = scrollView.contentOffset.y;     CGFloat contentHeight = scrollView.contentSize.height - scrollView.frame.size.height;     if (actualPosition >= contentHeight) {         [self.dataArr addObjectsFromArray:self.dataArr];         [self.tableView reloadData];     } }

69、代码方式调整屏幕亮度

1 2	// brightness属性值在0-1之间，0代表最小亮度，1代表最大亮度 [[UIScreen mainScreen] setBrightness:0.5];

70、获取当前应用CUP用量

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float cpu_usage() {     kern_return_t kr;     task_info_data_t tinfo;     mach_msg_type_number_t task_info_count;       task_info_count = TASK_INFO_MAX;     kr = task_info(mach_task_self(), TASK_BASIC_INFO, (task_info_t)tinfo, &task_info_count);     if (kr != KERN_SUCCESS) {         return -1;     }       task_basic_info_t      basic_info;     thread_array_t         thread_list;     mach_msg_type_number_t thread_count;       thread_info_data_t     thinfo;     mach_msg_type_number_t thread_info_count;       thread_basic_info_t basic_info_th;     uint32_t stat_thread = 0; // Mach threads       basic_info = (task_basic_info_t)tinfo;       // get threads in the task     kr = task_threads(mach_task_self(), &thread_list, &thread_count);     if (kr != KERN_SUCCESS) {         return -1;     }     if (thread_count > 0)         stat_thread += thread_count;       long tot_sec = 0;     long tot_usec = 0;     float tot_cpu = 0;     int j;       for (j = 0; j < (int)thread_count; j++)     {         thread_info_count = THREAD_INFO_MAX;         kr = thread_info(thread_list[j], THREAD_BASIC_INFO,                          (thread_info_t)thinfo, &thread_info_count);         if (kr != KERN_SUCCESS) {             return -1;         }           basic_info_th = (thread_basic_info_t)thinfo;           if (!(basic_info_th->flags & TH_FLAGS_IDLE)) {             tot_sec = tot_sec + basic_info_th->user_time.seconds + basic_info_th->system_time.seconds;             tot_usec = tot_usec + basic_info_th->user_time.microseconds + basic_info_th->system_time.microseconds;             tot_cpu = tot_cpu + basic_info_th->cpu_usage / (float)TH_USAGE_SCALE * 100.0;         }       } // for each thread       kr = vm_deallocate(mach_task_self(), (vm_offset_t)thread_list, thread_count * sizeof(thread_t));     assert(kr == KERN_SUCCESS);       return tot_cpu; }

71、float数据取整四舍五入

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CGFloat f = 4.65;     NSLog(@"%d", (int)f);    // 打印结果4       CGFloat f = 4.65;     NSLog(@"%d", (int)round(f));    // 打印结果5

72、删除UISearchBar系统默认边框

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// 方法一     searchBar.searchBarStyle = UISearchBarStyleMinimal;       // 方法二     [searchBar setBackgroundImage:[[UIImage alloc]init]];       // 方法三     searchBar.barTintColor = [UIColor whiteColor];

73、为UICollectionViewCell设置圆角和阴影

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cell.contentView.layer.cornerRadius = 2.0f; cell.contentView.layer.borderWidth = 1.0f; cell.contentView.layer.borderColor = [UIColor clearColor].CGColor; cell.contentView.layer.masksToBounds = YES;   cell.layer.shadowColor = [UIColor lightGrayColor].CGColor; cell.layer.shadowOffset = CGSizeMake(0, 2.0f); cell.layer.shadowRadius = 2.0f; cell.layer.shadowOpacity = 1.0f; cell.layer.masksToBounds = NO; cell.layer.shadowPath = [UIBezierPath bezierPathWithRoundedRect:cell.bounds cornerRadius:cell.contentView.layer.cornerRadius].CGPath;

74、让正在滑动的scrollView停止滚动(不是禁止，而是暂时停止滚动)

1	[scrollView setContentOffset:scrollView.contentOffset animated:NO];

75、使用xib设置UIView的边框、圆角

圆角和边框看下图即可设置

xib设置圆角边框.png

但是增加layer.borderColor的keyPath设置边框颜色并不能起作用，后来查了资料，这里应该用layer.borderUIColor，但是这里设置的颜色不起作用，无论设置什么颜色显示出来的都是黑色的。后来又去查了下，有种解决方案是给CALayer添加一个分类，提供一个 - (void)setBorderUIColor:(UIColor *)color;方法就可以解决了，实现如下：

xib设置边框颜色.png

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#import "CALayer+BorderColor.h"   @implementation CALayer (BorderColor)   - (void)setBorderUIColor:(UIColor *)color {     self.borderColor = color.CGColor; }

76、根据经纬度获取城市等信息

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// 创建经纬度     CLLocation *location = [[CLLocation alloc] initWithLatitude:latitude longitude:longitude];     //创建一个译码器     CLGeocoder *cLGeocoder = [[CLGeocoder alloc] init];     [cLGeocoder reverseGeocodeLocation:userLocation completionHandler:^(NSArray *placemarks, NSError *error) {         CLPlacemark *place = [placemarks objectAtIndex:0];         // 位置名     　　NSLog(@"name,%@",place.name);     　　// 街道     　　NSLog(@"thoroughfare,%@",place.thoroughfare);     　　// 子街道     　　NSLog(@"subThoroughfare,%@",place.subThoroughfare);     　　// 市     　　NSLog(@"locality,%@",place.locality);     　　// 区     　　NSLog(@"subLocality,%@",place.subLocality);      　　// 国家     　　NSLog(@"country,%@",place.country);         }     }];   /*  CLPlacemark中属性含义 name                    地名   thoroughfare            街道   subThoroughfare        街道相关信息，例如门牌等 locality                城市   subLocality            城市相关信息，例如标志性建筑   administrativeArea      直辖市   subAdministrativeArea  其他行政区域信息（自治区等）   postalCode              邮编   ISOcountryCode          国家编码   country                国家   inlandWater            水源，湖泊   ocean                  海洋   areasOfInterest        关联的或利益相关的地标 */

77、如何防止添加多个NSNotification观察者？

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// 解决方案就是添加观察者之前先移除下这个观察者 [[NSNotificationCenter defaultCenter] removeObserver:observer name:name object:object];         [[NSNotificationCenter defaultCenter] addObserver:observer selector:selector name:name object:object];

78、将一个xib添加到另外一个xib上

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// 假设你的自定义view名字为CustomView，你需要在CustomView.m中重写 `- (instancetype)initWithCoder:(NSCoder *)aDecoder` 方法，代码如下： - (instancetype)initWithCoder:(NSCoder *)aDecoder {     if ((self = [super initWithCoder:aDecoder])) {         [self addSubview:[[[NSBundle mainBundle] loadNibNamed:@"CustomView" owner:self options:nil] objectAtIndex:0]];     }     return self; }

将一个xib添加到另外一个xib上.png

79、处理字符串，使其首字母大写

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NSString *str = @"abcdefghijklmn";     NSString *resultStr;     if (str && str.length > 0) {         resultStr = [str stringByReplacingCharactersInRange:NSMakeRange(0,1) withString:[[str substringToIndex:1] capitalizedString]];     }     NSLog(@"%@", resultStr);

80、判断一个UIAlertView/UIAlertController是否显示

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// UIAlertView自带属性 if (alert.visible) {       NSLog(@"显示了"); } else {       NSLog(@"未显示"); }   // UIAlertController没有visible属性，需要自己判断，添加一个全局变量 BOOL visible UIAlertController *alertController = [UIAlertController alertControllerWithTitle:@"Title" message:@"message" preferredStyle:UIAlertControllerStyleAlert];     UIAlertAction *alertAction = [UIAlertAction actionWithTitle:@"ActionTitle" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) {         self.visible = NO;     }];     UIAlertAction *calcelAction = [UIAlertAction actionWithTitle:@"calcelTitle" style:UIAlertActionStyleCancel handler:^(UIAlertAction * _Nonnull action) {         self.visible = NO;     }];     [alertController addAction:alertAction];     [alertController addAction:calcelAction];     [self presentViewController:alertController animated:YES completion:^{         self.visible = YES;     }];

81、获取字符串中的数字

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- (NSString *)getNumberFromStr:(NSString *)str {     NSCharacterSet *nonDigitCharacterSet = [[NSCharacterSet decimalDigitCharacterSet] invertedSet];     return [[str componentsSeparatedByCharactersInSet:nonDigitCharacterSet] componentsJoinedByString:@""]; } 6     NSLog(@"%@", [self getNumberFromStr:@"a0b0c1d2e3f4fda8fa8fad9fsad23"]); // 00123488923

82、为UIView的某个方向添加边框

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// 添加UIView分类   // UIView+WZB.h #import     /**  边框方向    - WZBBorderDirectionTop: 顶部  - WZBBorderDirectionLeft: 左边  - WZBBorderDirectionBottom: 底部  - WZBBorderDirectionRight: 右边  */ typedef NS_ENUM(NSInteger, WZBBorderDirectionType) {     WZBBorderDirectionTop = 0,     WZBBorderDirectionLeft,     WZBBorderDirectionBottom,     WZBBorderDirectionRight };   @interface UIView (WZB)     /**  为UIView的某个方向添加边框    @param direction 边框方向  @param color 边框颜色  @param width 边框宽度  */ - (void)wzb_addBorder:(WZBBorderDirectionType)direction color:(UIColor *)color (CGFloat)width;   @end   // UIView+WZB.m #import "UIView+WZB.h"   @implementation UIView (WZB)   - (void)wzb_addBorder:(WZBBorderDirectionType)direction color:(UIColor *)color (CGFloat)width {     CALayer *border = [CALayer layer];     border.backgroundColor = color.CGColor;     switch (direction) {         case WZBBorderDirectionTop:         {             border.frame = CGRectMake(0.0f, 0.0f, self.bounds.size.width, width);         }             break;         case WZBBorderDirectionLeft:         {             border.frame = CGRectMake(0.0f, 0.0f, width, self.bounds.size.height);         }             break;         case WZBBorderDirectionBottom:         {             border.frame = CGRectMake(0.0f, self.bounds.size.height - width, self.bounds.size.width, width);         }             break;         case WZBBorderDirectionRight:         {             border.frame = CGRectMake(self.bounds.size.width - width, 0, width, self.bounds.size.height);         }             break;         default:             break;     }     [self.layer addSublayer:border]; }

83、通过属性设置UISwitch、UIProgressView等控件的宽高

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mySwitch.transform = CGAffineTransformMakeScale(5.0f, 5.0f);   progressView.transform = CGAffineTransformMakeScale(5.0f, 5.0f);

84、自动搜索功能，用户连续输入的时候不搜索，用户停止输入的时候自动搜索(我这里设置的是0.5s，可根据需求更改)

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// 输入框文字改变的时候调用 -(void)searchBar:(UISearchBar *)searchBar textDidChange:(NSString *)searchText{     // 先取消调用搜索方法     [NSObject cancelPreviousPerformRequestsWithTarget:self selector:@selector(searchNewResult) object:nil];     // 0.5秒后调用搜索方法     [self performSelector:@selector(searchNewResult) withObject:nil afterDelay:0.5]; }

85、修改UISearchBar的占位文字颜色

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// 方法一（推荐使用）     UITextField *searchField = [searchBar valueForKey:@"_searchField"];     [searchField setValue:[UIColor blueColor] forKeyPath:@"_placeholderLabel.textColor"];       // 方法二（已过期）     [[UILabel appearanceWhenContainedIn:[UISearchBar class], nil] setTextColor:[UIColor redColor]];       // 方法三（已过期）     NSDictionary *placeholderAttributes = @{NSForegroundColorAttributeName : [UIColor redColor], NSFontAttributeName : [UIFont fontWithName:@"HelveticaNeue" size:15],};     NSAttributedString *attributedPlaceholder = [[NSAttributedString alloc] initWithString:searchBar.placeholder attributes:placeholderAttributes];     [[UITextField appearanceWhenContainedIn:[UISearchBar class], nil] setAttributedPlaceholder:attributedPlaceholder];

86、某个界面多个事件同时响应引起的问题(比如，两个button同时按push到新界面，两个都会响应，可能导致push重叠)

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// UIView有个属性叫做exclusiveTouch，设置为YES后，其响应事件会和其他view互斥(有其他view事件响应的时候点击它不起作用) view.exclusiveTouch = YES;   // 一个一个设置太麻烦了，可以全局设置 [[UIView appearance] setExclusiveTouch:YES];   // 或者只设置button [[UIButton appearance] setExclusiveTouch:YES];

87、修改tabBar的frame

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// 子类化UITabBarViewController，我这里以修改tabBar高度为例，重写viewWillLayoutSubviews方法 #import "WZBTabBarViewController.h"   @interface WZBTabBarViewController ()   @end   @implementation WZBTabBarViewController - (void)viewWillLayoutSubviews {       CGRect tabFrame = self.tabBar.frame;     tabFrame.size.height = 100;     tabFrame.origin.y = self.view.frame.size.height - 100;     self.tabBar.frame = tabFrame; } @end

88、修改键盘背景颜色

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// 设置某个键盘颜色     textField.keyboardAppearance = UIKeyboardAppearanceAlert;   // 设置工程中所有键盘颜色 [[UITextField appearance] setKeyboardAppearance:UIKeyboardAppearanceAlert];

89、修改image颜色

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UIImage *image = [UIImage imageNamed:@"test"];     imageView.image = [image imageWithRenderingMode:UIImageRenderingModeAlwaysTemplate];     CGRect rect = CGRectMake(0, 0, image.size.width, image.size.height);     UIGraphicsBeginImageContext(rect.size);     CGContextRef context = UIGraphicsGetCurrentContext();     CGContextClipToMask(context, rect, image.CGImage);     CGContextSetFillColorWithColor(context, [[UIColor redColor] CGColor]);     CGContextFillRect(context, rect);     UIImage *img = UIGraphicsGetImageFromCurrentImageContext();     UIGraphicsEndImageContext();       UIImage *flippedImage = [UIImage imageWithCGImage:img.CGImage scale:1.0 orientation: UIImageOrientationDownMirrored];     imageView.image = flippedImage;

90、动画执行removeFromSuperview

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[UIView animateWithDuration:0.2                      animations:^{                          view.alpha = 0.0f;                      } completion:^(BOOL finished){                          [view removeFromSuperview];                      }];

91、设置UIButton高亮背景颜色

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[UIView animateWithDuration:0.2                      animations:^{                          view.alpha = 0.0f;                      } completion:^(BOOL finished){                          [view removeFromSuperview];                      }];

92、设置UIButton高亮时的背景颜色

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// 方法一、子类化UIButton，重写setHighlighted:方法，代码如下 #import "WZBButton.h"   @implementation WZBButton   - (void)setHighlighted:(BOOL)highlighted {     [super setHighlighted:highlighted];       UIColor *normalColor = [UIColor greenColor];     UIColor *highlightedColor = [UIColor redColor];     self.backgroundColor = highlighted ? highlightedColor : normalColor;   }   // 方法二、利用setBackgroundImage:forState:方法 [button setBackgroundImage:[self imageWithColor:[UIColor blueColor]] forState:UIControlStateHighlighted];   - (UIImage *)imageWithColor:(UIColor *)color {     CGRect rect = CGRectMake(0.0f, 0.0f, 1.0f, 1.0f);     UIGraphicsBeginImageContext(rect.size);     CGContextRef context = UIGraphicsGetCurrentContext();       CGContextSetFillColorWithColor(context, [color CGColor]);     CGContextFillRect(context, rect);       UIImage *image = UIGraphicsGetImageFromCurrentImageContext();     UIGraphicsEndImageContext();       return image; }

93、关于图片拉伸

推荐看这个博客，讲的很详细：http://blog.csdn.net/q199109106q/article/details/8615661

94、利用runtime获取一个类所有属性

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- (NSArray *)allPropertyNames:(Class)aClass {     unsigned count;     objc_property_t *properties = class_copyPropertyList(aClass, &count);       NSMutableArray *rv = [NSMutableArray array];       unsigned i;     for (i = 0; i < count; i++)     {         objc_property_t property = properties[i];         NSString *name = [NSString stringWithUTF8String:property_getName(property)];         [rv addObject:name];     }       free(properties);       return rv; }

95、设置textView的某段文字变成其他颜色

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- (void)setupTextView:(UITextView *)textView text:(NSString *)text color:(UIColor *)color {     NSMutableAttributedString *string = [[NSMutableAttributedString alloc]initWithString:textView.text];     [string addAttribute:NSForegroundColorAttributeName value:color range:[textView.text rangeOfString:text]];     [textView setAttributedText:string]; }

96、让push跳转动画像modal跳转动画那样效果(从下往上推上来)

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- (void)push { TestViewController *vc = [[TestViewController alloc] init];     vc.view.backgroundColor = [UIColor redColor];     CATransition* transition = [CATransition animation];     transition.duration = 0.4f;     transition.type = kCATransitionMoveIn;     transition.subtype = kCATransitionFromTop;     [self.navigationController.view.layer addAnimation:transition forKey:kCATransition];     [self.navigationController pushViewController:vc animated:NO]; }   - (void)pop { CATransition* transition = [CATransition animation];     transition.duration = 0.4f;     transition.type = kCATransitionReveal;     transition.subtype = kCATransitionFromBottom;     [self.navigationController.view.layer addAnimation:transition forKey:kCATransition];     [self.navigationController popViewControllerAnimated:NO]; }

97、上传图片太大，压缩图片

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-(UIImage *)resizeImage:(UIImage *)image {     float actualHeight = image.size.height;     float actualWidth = image.size.width;     float maxHeight = 300.0;     float maxWidth = 400.0;     float imgRatio = actualWidth/actualHeight;     float maxRatio = maxWidth/maxHeight;     float compressionQuality = 0.5;//50 percent compression       if (actualHeight > maxHeight || actualWidth > maxWidth)     {         if(imgRatio < maxRatio)         {             //adjust width according to maxHeight             imgRatio = maxHeight / actualHeight;             actualWidth = imgRatio * actualWidth;             actualHeight = maxHeight;         }         else if(imgRatio > maxRatio)         {             //adjust height according to maxWidth             imgRatio = maxWidth / actualWidth;             actualHeight = imgRatio * actualHeight;             actualWidth = maxWidth;         }         else         {             actualHeight = maxHeight;             actualWidth = maxWidth;         }     }       CGRect rect = CGRectMake(0.0, 0.0, actualWidth, actualHeight);     UIGraphicsBeginImageContext(rect.size);     [image drawInRect:rect];     UIImage *img = UIGraphicsGetImageFromCurrentImageContext();     NSData *imageData = UIImageJPEGRepresentation(img, compressionQuality);     UIGraphicsEndImageContext();       return [UIImage imageWithData:imageData];   }