Iphone 如何基于键盘自动移动UIScrollView以使UITextfield可见？

-我已经尝试了这里提出的所有方法，但我的scrollview没有基于键盘向上移动。我想实现iPad笔记中的移动，当文本靠近键盘时，文档向上移动

我是这样做的。不要忘记在UITextField上设置委托

- (void) scrollViewAdaptToStartEditingTextField:(UITextField*)textField
{
    CGPoint point = CGPointMake(0, textField.frame.origin.y - 1.5 * textField.frame.size.height);
    [scrollView setContentOffset:point animated:YES];
}

- (void) scrollVievEditingFinished:(UITextField*)textField
{
    CGPoint point = CGPointMake(0, 0);
    [scrollView setContentOffset:point animated:YES];
}

- (BOOL) textFieldShouldBeginEditing:(UITextField *)textField
{
    [self scrollViewAdaptToStartEditingTextField:textField];
    return YES;
}

- (BOOL) textFieldShouldReturn:(UITextField *)textField
{
    [textField resignFirstResponder];
    [self scrollVievEditingFinished:textField];
    return YES;
}

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这里是swift 3.0版本

func scrollViewAdapt(toStartEditing textField: UITextField) {
        let point = CGPoint(x: CGFloat(0), y: CGFloat(textField.frame.origin.y - 1.7 * textField.frame.size.height))
        scrollView.setContentOffset(point, animated: true)
    }

    func scrollVievEditingFinished(_ textField: UITextField) {
        let point = CGPoint(x: CGFloat(0), y: CGFloat(0))
        scrollView.setContentOffset(point, animated: true)
    }
func textFieldShouldBeginEditing(_ textField: UITextField) -> Bool {

        self.scrollViewAdapt(toStartEditing: textField)
        return true
    }

    func textFieldShouldReturn(_ textField: UITextField) -> Bool {
        textField.resignFirstResponder()
        self.scrollVievEditingFinished(textField)
        return true
    }

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提供更多使用信息。