UITextView

UITextView及键盘隐藏

1.创建并初始化 
UITextView 
UITextView *textView; 
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 tocome to serve their country.\n\nNow is the time for all good developers to cometo 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 
（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。 
- (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。 
#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。 
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]init]    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]; 
（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： 
 
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]; 
只有UILabel需要定义的numberoflines为0，即不做行数的限制。如下： 
[label setNumberOfLines:0];  
[label setFrame:CGRectMake(40, 135, 240, size.height+10)];  
[label setText:desc]; 
（6）UITextView自定选择文字后的菜单 
在ViewDidLoad中加入： 
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： 
-(BOOL)canPerformAction:(SEL)action withSender:(id)sender { 
if(action ==@selector(changeColor:)) { 
if(textView.selectedRange.length>0) return YES;  
} return NO;  
} 
 
 
 
点击非输入框时隐藏键盘 
 
 
- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event 
{ 
    [usertf resignFirstResponder]; 
    [paswldtf resignFirstResponder]; 
} 
 
 
 
 
摘自http://blog.csdn.net/qiaoshe/article/details/6955091