监听键盘工作,避免挡住文字输入

- (void)viewDidLoad 
{ 
    [superviewDidLoad]; 
    // Do anyadditional setup after loading the view, typically from anib. 
   self.textView=[[UITextViewalloc]initWithFrame:self.view.frame]; 
   self.textView.text=@"请输入文字"; 
    [self.viewaddSubview:self.textView]; 
} 
 
- (void)didReceiveMemoryWarning 
{ 
    [superdidReceiveMemoryWarning]; 
    // Disposeof any resources that can berecreated. 
} 
 
-(void)viewWillAppear:(BOOL)animated 
{ 
   //注册通知,监听键盘出现 
   [[NSNotificationCenterdefaultCenter]addObserver:self 
                                           selector:@selector(handleKeyboardDidShow:) 
                                               name:UIKeyboardDidShowNotification 
                                             object:nil]; 
   //注册通知，监听键盘消失事件 
   [[NSNotificationCenterdefaultCenter]addObserver:self 
                                           selector:@selector(handleKeyboardDidHidden) 
                                               name:UIKeyboardDidHideNotification 
                                             object:nil]; 
    [superviewWillAppear:YES]; 
} 
 
//监听事件 
-(void)handleKeyboardDidShow:(NSNotification*)paramNotification 
{ 
   //获取键盘高度 
    NSValue*keyboardRectAsObject=[[paramNotificationuserInfo]objectForKey:UIKeyboardFrameEndUserInfoKey]; 
     
    CGRectkeyboardRect; 
   [keyboardRectAsObjectgetValue:&keyboardRect]; 
     
   self.textView.contentInset=UIEdgeInsetsMake(0,0,keyboardRect.size.height, 0); 
} 
 
- (void)handleKeyboardDidHidden 
{ 
   self.textView.contentInset=UIEdgeInsetsZero; 
} 
 
-(void)viewDidDisappear:(BOOL)animated 
{ 
   [[NSNotificationCenter defaultCenter]removeObserver:self]; 
}