ios 监听键盘的弹出通知

在开发中经常用到监听键盘的弹出弹入，并据此进行一些操作。
1.注册监听

 [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyBoardWillShow:) name:UIKeyboardWillShowNotification object:nil];
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyBoardWillHide:) name:UIKeyboardWillHideNotification object:nil];

2.根据监听获取键盘的高度，以此进行后续一下操作

- (void)keyBoardWillShow:(NSNotification *)note
{
    // 获取用户信息
    NSDictionary *userInfo = [NSDictionary dictionaryWithDictionary:note.userInfo];
    // 获取键盘高度
    CGRect keyBoardBounds  = [[userInfo objectForKey:UIKeyboardFrameEndUserInfoKey] CGRectValue];
    CGFloat keyBoardHeight = keyBoardBounds.size.height;
    // 获取键盘动画时间
   CGFloat animationTime  = [[userInfo objectForKey:UIKeyboardAnimationDurationUserInfoKey] floatValue];
    
}
//键盘收起
- (void)keyBoardWillShow:(NSNotification *)note{

}

查看更多！