键盘监听事件

 //    键盘弹出通知    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(ketBoardWillShow:) name:UIKeyboardWillShowNotification object:nil];    //    键盘回收通知    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(ketBoardWillHide:) name:UIKeyboardWillHideNotification object:nil];- (void)ketBoardWillShow:(NSNotification *)sender{    //    获取键盘的Frame    CGRect keyBoardRect = [sender.userInfo[UIKeyboardFrameBeginUserInfoKey]CGRectValue];    CGRect frame = self.view.frame;    frame.origin.y =  -keyBoardRect.size.height;    self.view.frame = frame;}//键盘消失- (void)ketBoardWillHide:(NSNotification *)sender{    self.view.frame = [UIScreen mainScreen].bounds;}