UIKeyboardWillShowNotification//键盘弹出

UIKeyboardWillHideNotification//键盘缩回

   //用通知监听键盘的弹出
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboarShow:) name:UIKeyboardWillShowNotification object:nil];
   
   //监听键盘的缩回
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyBoardHiden:) name:UIKeyboardWillHideNotification object:nil];
   
    //设置delegate
    _myTextView.delegate=self;
   

    // Do any additional setup after loading the view, typically from a nib.
}
//显示
-(void)keyboarShow:(NSNotification *)notification{
   //获取键盘的高度
    CGRect rect =[notification.userInfo[UIKeyboardFrameEndUserInfoKey] CGRectValue];
   //计算出 textView的height
    CGRect textViewRect=_myTextView.frame;
     CGFloat height=textViewRect.size.height-rect.size.height;
    textViewRect.size.height=height;
    [UIView animateWithDuration:.2 animations:^{
        self.myTextView.frame=textViewRect;
    }];

}

//键盘隐藏时调用

-(void)keyBoardHiden:(NSNotification *)notification{
    _myTextView.frame=self.view.frame;
}

 

这样就可以达到我们想要的效果了  如果有什么问题可以提问哦。大家一起学习