iOS 返回键盘的实时高度(含三方键盘)

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

#pragma mark -- 键盘显示 --
- (void)keyboardWillShow:(NSNotification *)notification {
    NSDictionary *info = [notification userInfo];
    double duration = [info[UIKeyboardAnimationDurationUserInfoKey] doubleValue];
    CGFloat curkeyBoardHeight = [[info objectForKey:@"UIKeyboardBoundsUserInfoKey"] CGRectValue].size.height;
    CGRect begin = [[info objectForKey:@"UIKeyboardFrameBeginUserInfoKey"] CGRectValue];
    CGRect end = [[info objectForKey:@"UIKeyboardFrameEndUserInfoKey"] CGRectValue];

    CGFloat keyBoardHeight;

    /*! 第三方键盘回调三次问题，监听仅执行最后一次 */
    if(begin.size.height > 0 && (begin.origin.y - end.origin.y > 0)){
        keyBoardHeight = curkeyBoardHeight;
        [UIView animateWithDuration:duration animations:^{
            NSLog(@"键盘高度%f",keyBoardHeight);
        }];
    }
}