iOS开发中如何在键盘弹出时改变View的高度

//监听键盘弹出和隐藏
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWillShow:) name:UIKeyboardWillShowNotification object:nil];
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWillHide:) name:UIKeyboardWillHideNotification object:nil];

- (void)keyboardWillShow:(NSNotification *)note
{
    //取得键盘弹出时间
    CGFloat duration = [note.userInfo[UIKeyboardAnimationDurationUserInfoKey] floatValue];
    //取得键盘高度
    CGRect keyboardFrame = [note.userInfo[UIKeyboardFrameEndUserInfoKey] CGRectValue];
    CGFloat keyboardHeight = keyboardFrame.size.height;
    //option的值设置为7 << 16会让view跟键盘弹出效果同步
    [UIView animateWithDuration:duration delay:0 options:7 << 16 animations:^{
        self.ContentSv.transform = CGAffineTransformMakeTranslation(0, -keyboardHeight);
    } completion:nil];
}

- (void)keyboardWillHide:(NSNotification *)note
{
    CGFloat duration = [note.userInfo[UIKeyboardAnimationDurationUserInfoKey] floatValue];
    [UIView animateWithDuration:duration delay:0 options:7 << 16 animations:^{
        self.ContentSv.transform = CGAffineTransformIdentity;
    } completion:nil];
}