1.创建并初始化
创建UITextView的文件，并在.h文件中写入如下代码：
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#import <UIKit/UIKit.h> @interface TextViewController : UIViewController <UITextViewDelegate> { UITextView *textView; } @property (nonatomic, retain) UITextView *textView; @end |
在.m文件中初始化这个textview，写入代码如下：
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self.textView = [[[UITextView alloc] initWithFrame:self.view.frame] autorelease]; //初始化大小并自动释放 self.textView.textColor = [UIColor blackColor];//设置textview里面的字体颜色 self.textView.font = [UIFont fontWithName:@"Arial" size:18.0];//设置字体名字和字体大小 self.textView.delegate = self;//设置它的委托方法 self.textView.backgroundColor = [UIColor whiteColor];//设置它的背景颜色 self.textView.text = @"Now is the time for all good developers to come to serve their country.\n\nNow is the time for all good developers to come to serve their country.";//设置它显示的内容 self.textView.returnKeyType = UIReturnKeyDefault;//返回键的类型 self.textView.keyboardType = UIKeyboardTypeDefault;//键盘类型 self.textView.scrollEnabled = YES;//是否可以拖动 self.textView.autoresizingMask = UIViewAutoresizingFlexibleHeight;//自适应高度 [self.view addSubview: self.textView];//加入到整个页面中 |
2. UITextView退出键盘的几种方式
因为你点击UITextView会出现键盘，如果你退出键盘，有如下几种方式：
（1）如果你程序是有导航条的，可以在导航条上面加多一个Done的按钮，用来退出键盘，当然要先实UITextViewDelegate。
代码如下：
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- (void)textViewDidBeginEditing:(UITextView *)textView { UIBarButtonItem *done = [[[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemDone target:self action:@selector(leaveEditMode)] autorelease]; self.navigationItem.rightBarButtonItem = done; } - (void)textViewDidEndEditing:(UITextView *)textView { self.navigationItem.rightBarButtonItem = nil; } - (void)leaveEditMode { [self.textView resignFirstResponder]; } |
（2）如果你的textview里不用回车键，可以把回车键当做退出键盘的响应键。
代码如下：
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#pragma mark - UITextView Delegate Methods -(BOOL)textView:(UITextView *)textView shouldChangeTextInRange:(NSRange)range replacementText:(NSString *)text { if ([text isEqualToString:@"\n"]) { [textView resignFirstResponder]; return NO; } return YES; } |
这样无论你是使用电脑键盘上的回车键还是使用弹出键盘里的return键都可以达到退出键盘的效果。
（3）还有你也可以自定义其他加载键盘上面用来退出，比如在弹出的键盘上面加一个view来放置退出键盘的Done按钮。
代码如下：
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UIToolbar * topView = [[UIToolbar alloc]initWithFrame:CGRectMake(0, 0, 320, 30)]; [topView setBarStyle:UIBarStyleBlack]; UIBarButtonItem * helloButton = [[UIBarButtonItem alloc]initWithTitle:@"Hello" style:UIBarButtonItemStyleBordered target:self action:nil]; UIBarButtonItem * btnSpace = [[UIBarButtonItem alloc]initWithBarButtonSystemItem:UIBarButtonSystemItemFlexibleSpace target:self action:nil]; UIBarButtonItem * doneButton = [[UIBarButtonItem alloc]initWithTitle:@"Done" style:UIBarButtonItemStyleDone target:self action:@selector(dismissKeyBoard)]; NSArray * buttonsArray = [NSArray arrayWithObjects:helloButton,btnSpace,doneButton,nil]; [doneButton release]; [btnSpace release]; [helloButton release]; [topView setItems:buttonsArray]; [tvTextView setInputAccessoryView:topView]; -(IBAction)dismissKeyBoard { [tvTextView resignFirstResponder]; } |
（4）设置UITextView圆角问题
做法是在 #import QuartzCore/QuartzCore.h 后，便能調用 [textView.layer setCornerRadius:10]; 來把 UITextView 设定圓角
（5）UITextView根据文本大小自适应高度
通过实现文本字数来确定高度，如下：
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NSString * desc = @"Description it is a test font, and don't become angry for which i use to do here.Now here is a very nice party from american or not!"; CGSize size = [desc sizeWithFont:[UIFont systemFontOfSize:14] constrainedToSize:CGSizeMake(240, 2000) lineBreakMode:UILineBreakModeWordWrap]; |
然后需要定义UITextView的numberoflines为0，即不做行数的限制。如下：
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[textView setNumberOfLines:0]; [textView setFrame:CGRectMake(40, 135, 240, size.height+10)]; [textView setText:desc]; |
（6）UITextView自定选择文字后的菜单
在ViewDidLoad中加入：
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UIMenuItem *menuItem = [[UIMenuItem alloc]initWithTitle:@"分享到新浪微博" action:@selector(changeColor:)]; UIMenuController *menu = [UIMenuController sharedMenuController]; [menu setMenuItems:[NSArray arrayWithObject:menuItem]]; [menuItem release]; |
当然上面那个@selector里面的changeColor方法还是自己写吧，也就是说点击了我们自定义的菜单项后会触发的方法。
然后还得在代码里加上一个方法：
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-(BOOL)canPerformAction:(SEL)action withSender:(id)sender { if(action == @selector(changeColor:)) { if(textView.selectedRange.length>0) return YES; } return NO; } |
效果图如下所示：
今天的UITextView就讲到这里，主要讲了UITextView的初始化和开发中会遇到的一些问题和自定义等问题。谢谢大家支持哈。
2、textView.contentSize.Height是输入的行数所占的高度，每行占15，可以用这个参数实现比如：TextView自适应输入的文本高度等功能。
3、 修改边框
mTextView.layer.masksToBounds=YES;
mTextView.layer.borderWidth=0.7;
mTextView.layer.borderColor=[[UIColor redColor] CGColor];
4、
zoomView = [self browserViewInWebView];
- (void)keyboardWillShow:(NSNotification *)aNotification
{
CGRect keyboardRect = [[[aNotification userInfo] objectForKey:
UIKeyboardFrameEndUserInfoKey] CGRectValue];
NSTimeInterval animationDuration =
[[[aNotification userInfo] objectForKey:
UIKeyboardAnimationDurationUserInfoKey] doubleValue];
CGRect frame = zoomView.frame;
NSLog(@"scroll height1:%f",frame.size.height);
frame.size.height -= keyboardRect.size.height;
[UIView beginAnimations:@"ResizeForKeyborad" context:nil];
[UIView setAnimationDuration:animationDuration];
[self scrollViewOfWebview:self].frame = frame;
[UIView commitAnimations];
}
- (void)keyboardWillHide:(NSNotification *)aNotification
{
CGRect keyboardRect = [[[aNotification userInfo] objectForKey:
UIKeyboardFrameEndUserInfoKey] CGRectValue];
NSTimeInterval animationDuration =
[[[aNotification userInfo] objectForKey:
UIKeyboardAnimationDurationUserInfoKey] doubleValue];
CGRect frame = zoomView.frame;
frame.size.height += keyboardRect.size.height;
[UIView beginAnimations:@"ResizeForKeyborad" context:nil];
[UIView setAnimationDuration:animationDuration];
[self scrollViewOfWebview:self].frame = frame;
[UIView commitAnimations];
}