ios开发零散知识点总结

1：当有导航栏的时候，子视图为UIScrollView，或是继承于UIScrollView的控件如UITableView，UICollectionView等，控制器会自动调用

self.automaticallyAdjustsScrollViewInsets = YES；方法，自动为控件添加64的额外的滚动区域，若存在多个控件，则系统会自动找到第一个添加的控件，执行此方法，增加64额外的滚动区域，如果想禁止此操作，可在控制器中实现方法：self.automaticallyAdjustsScrollViewInsets = NO；或是设置UIScrollView的contentInset，tableView的contentInset，来减少滚动区域。

#import "ViewController.h"

@interface ViewController ()

@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    
    // 1：不会自动去调整uiscrollView的contentInset属性
    self.automaticallyAdjustsScrollViewInsets = NO;
    UIScrollView *scrollView = [[UIScrollView alloc] init];
    scrollView.frame = CGRectMake(0, 200, 200, 200);
    scrollView.backgroundColor = [UIColor redColor];
    [self.view addSubview:scrollView];
    
    [scrollView addSubview:[[UISwitch alloc] init]];
}

2：在宏定义文件中的NSLog定义

#ifdef DEBUG

#define DLog(...)  NSLog(__VA_ARGS__)

#else

#define DLog(...)

#endif

一些颜色的宏定义

//1:RGB颜色
#define RGB(a,b,c) [UIColor colorWithRed:(a)/255.0 green:(b)/255.0 blue:(c)/255.0 alpha:1]

//2:包含设置透明度
#define RGBColor(a,b,c,d) [UIColor colorWithRed:(a)/255.0 green:(b)/255.0 blue:(c)/255.0 alpha:d]

//3：随机色
#define ARC4Color RGB(arc4random_uniform(256),arc4random_uniform(256),arc4random_uniform(256))

3：pch文件的定义：在项目的Target---BuildSetting---prefixHeader---删除在桌面文件夹的路径，只保留项目的路径，再输入$(SRCROOT),如：$(SRCROOT)/网易新闻抽屉效果/Classes/Main/Utils/PrefixHeader.pch

4：通过图形上下文将color绘制成一张图片：

//提供颜色接口，返回一张图片

#import <UIKit/UIKit.h>

@interface UIImage (Cqb)

+(UIImage*)imageWithColor:(UIColor*)color;
@end

#import "UIImage+Cqb.h"

@implementation UIImage (Cqb)

+ (UIImage*)imageWithColor:(UIColor*)color {
    
    //1:开启基于位图的图形上下文
    CGFloat imageWidth = 100;
    CGFloat imageHeight = 100;
    UIGraphicsBeginImageContextWithOptions(CGSizeMake(imageWidth, imageHeight), NO, 0.0);
    
    //2:画一个color颜色的矩形框
    [color set];
    UIRectFill(CGRectMake(0, 0, imageWidth, imageHeight));
    
    //3:得到图片
    UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
    
    //4:关闭图形上下文
    UIGraphicsEndImageContext();
    
    return image;
}

5：UIView计算尺寸的分类：

#import <UIKit/UIKit.h>

@interface UIView (Cqb)
@property (nonatomic,assign)CGFloat X;
@property (nonatomic,assign)CGFloat Y;
@property (nonatomic,assign)CGFloat width;
@property (nonatomic,assign)CGFloat height;
@property (nonatomic,assign)CGFloat centerX;
@property (nonatomic,assign)CGFloat centerY;
@property (nonatomic,assign)CGSize  size;
@end

#import "UIView+Cqb.h"

@implementation UIView (Cqb)

- (void)setX:(CGFloat)X {
    
    CGRect frame = self.frame;
    frame.origin.x = X;
    self.frame = frame;
    
}

- (CGFloat)X {
    
    return self.frame.origin.x;
}

- (void)setY:(CGFloat)Y {
    
    CGRect frame = self.frame;
    frame.origin.y = Y;
    self.frame = frame;
    
}

- (CGFloat)Y {
    
    return self.frame.origin.y;
}

- (void)setWidth:(CGFloat)width {
    
    CGRect frame = self.frame;
    frame.size.width = width;
    self.frame = frame;

}

- (CGFloat)width {
    
    return self.frame.size.width;
}

- (void)setHeight:(CGFloat)height {
    
    CGRect frame = self.frame;
    frame.size.height = height;
    self.frame = frame;
}

- (CGFloat)height {
    
    return self.frame.size.height;
}

- (void)setCenterX:(CGFloat)centerX {
    
    CGPoint center = self.center;
    center.x = centerX;
    self.center = center;

}

- (CGFloat)centerX {
    
    return self.center.x;
}

- (void)setCenterY:(CGFloat)centerY {
    
    CGPoint center = self.center;
    center.y = centerY;
    self.center = center;
}

- (CGFloat)centerY {
    
    return self.center.y;
}

- (void)setSize:(CGSize)size {
    
    CGRect frame = self.frame;
    frame.size = size;
    self.frame = frame;

}

- (CGSize)size {
    
    return self.frame.size;
}


@end

6：对自定义UIBarButtonItem的分类封装：

#import <UIKit/UIKit.h>

@interface UIBarButtonItem (Extension)
+ (UIBarButtonItem *)itemWithImageName:(NSString *)imageName target:(id)target action:(SEL)action;
@end

#import "UIBarButtonItem+Extension.h"

@implementation UIBarButtonItem (Extension)
+ (UIBarButtonItem *)itemWithImageName:(NSString *)imageName target:(id)target action:(SEL)action
{
    UIButton *button = [[UIButton alloc] init];
    [button setBackgroundImage:[UIImage imageNamed:imageName] forState:UIControlStateNormal];
    
    // 设置按钮的尺寸为背景图片的尺寸
    button.size = button.currentBackgroundImage.size;
    
    // 监听按钮点击
    [button addTarget:target action:action forControlEvents:UIControlEventTouchUpInside];
    return [[UIBarButtonItem alloc] initWithCustomView:button];
}
@end

 6：当做真机调试的时候，要在buildSetting中配置好证书，并在info里选择开发者账号才可以