在（BOOL）textFieldShouldBeginEditing:（UITextField*）textField中

if (textField.frame.origin.y > self.view.frame.size.height - 216)
    {
        if (screenHeight>500)
            scrollView.contentSize = CGSizeMake(0.0, scrollView.contentSize.height + 100);
        else
            scrollView.contentSize = CGSizeMake(0.0, scrollView.contentSize.height + 216);
        CGPoint scrollPoint = CGPointMake(0.0,(textField.frame.origin.y - (self.view.frame.size.height - 216 - textField.frame.size.height - 20)));
        [scrollView setContentOffset:scrollPoint animated:YES];
    }
    [scrollView setScrollEnabled:YES];

辞职时，你需要写以下代码

scrollView.contentSize = CGSizeMake(0.0, 640);
CGPoint scrollPoint = CGPointMake(0.0,0.0);
[scrollView setContentOffset:scrollPoint animated:YES]; 

本文档详细介绍了此问题的解决方案。查看“移动位于键盘下的内容”下的源代码。这很简单。

编辑：注意到示例中有一个小故障。您可能希望侦听UIKeyboardWillHideNotification，而不是UIKeyboard DidHideNotification。否则，在键盘关闭动画期间，键盘后面的滚动视图将被剪裁。

对于Swift程序员：

这将为您完成所有工作，只需将这些放在视图控制器类中，并将UITextFieldDelegate实现到视图控制器，并将textField的委托设置为self

textField.delegate = self // Setting delegate of your UITextField to self

实现委托回调方法：

func textFieldDidBeginEditing(textField: UITextField) {
    animateViewMoving(true, moveValue: 100)
}

func textFieldDidEndEditing(textField: UITextField) {
    animateViewMoving(false, moveValue: 100)
}

// Lifting the view up
func animateViewMoving (up:Bool, moveValue :CGFloat){
    let movementDuration:NSTimeInterval = 0.3
    let movement:CGFloat = ( up ? -moveValue : moveValue)
    UIView.beginAnimations( "animateView", context: nil)
    UIView.setAnimationBeginsFromCurrentState(true)
    UIView.setAnimationDuration(movementDuration )
    self.view.frame = CGRectOffset(self.view.frame, 0,  movement)
    UIView.commitAnimations()
}

对于Swift 4、4.2、5：改变

self.view.frame = CGRectOffset(self.view.frame, 0,  movement)

to

self.view.frame = self.view.frame.offsetBy(dx: 0, dy: movement)

关于此实现的最后一点注意事项：如果在显示键盘时将另一个视图控制器推到堆栈上，这将产生一个错误，其中视图返回到其中心框架，但键盘偏移未重置。例如，您的键盘是nameField的第一个响应者，但随后您按下一个按钮，将帮助视图控制器推到堆栈上。若要修复偏移错误，请确保在离开视图控制器之前调用nameField.issentFirstResponder（），确保同时调用textFieldDidEndEditing委托方法。我在viewWillDisappear方法中这样做。

试试这个小把戏。

- (void)textFieldDidBeginEditing:(UITextField *)textField
{
    [self animateTextField: textField up: YES];
}

- (void)textFieldDidEndEditing:(UITextField *)textField
{
    [self animateTextField: textField up: NO];
}

- (void) animateTextField: (UITextField*) textField up: (BOOL) up
{
    const int movementDistance = textField.frame.origin.y / 2; // tweak as needed
    const float movementDuration = 0.3f; // tweak as needed

    int movement = (up ? -movementDistance : movementDistance);

    [UIView beginAnimations: @"anim" context: nil];
    [UIView setAnimationBeginsFromCurrentState: YES];
    [UIView setAnimationDuration: movementDuration];
    self.view.frame = CGRectOffset(self.view.frame, 0, movement);
    [UIView commitAnimations];
}

它不需要滚动视图就可以移动视图框架。您可以更改viewcontroller视图的框架，以便整个视图向上移动到足以将firstresponser文本字段置于键盘上方。当我遇到这个问题时，我创建了一个UIViewController的子类来实现这一点。它观察键盘是否会出现通知，并找到第一个响应者子视图，并且（如果需要）它向上动画主视图，以使第一个响应器位于键盘上方。当键盘隐藏时，它会将视图设置回原来的位置。

要使用此子类，请将自定义视图控制器设置为GMKeyboardVC的子类，并继承此功能（只需确保如果实现viewWillAppear和viewWillDisappear，它们必须调用super）。这个班在github上。

斯威夫特4。

您可以使用带有动画的UIKeyBoard轻松上下移动UITextField或UIView

import UIKit

class ViewController: UIViewController, UITextFieldDelegate {

    @IBOutlet var textField: UITextField!
    @IBOutlet var chatView: UIView!

    override func viewDidLoad() {
        super.viewDidLoad()
        NotificationCenter.default.addObserver(self, selector: #selector(keyboardWillChange), name: .UIKeyboardWillChangeFrame, object: nil)
    }

    override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
        textField.resignFirstResponder()
    }

    @objc func keyboardWillChange(notification: NSNotification) {

        let duration = notification.userInfo![UIKeyboardAnimationDurationUserInfoKey] as! Double
        let curve = notification.userInfo![UIKeyboardAnimationCurveUserInfoKey] as! UInt
        let curFrame = (notification.userInfo![UIKeyboardFrameBeginUserInfoKey] as! NSValue).cgRectValue
        let targetFrame = (notification.userInfo![UIKeyboardFrameEndUserInfoKey] as! NSValue).cgRectValue
        let deltaY = targetFrame.origin.y - curFrame.origin.y
        print("deltaY",deltaY)

        UIView.animateKeyframes(withDuration: duration, delay: 0.0, options: UIViewKeyframeAnimationOptions(rawValue: curve), animations: {
            self.chatView.frame.origin.y+=deltaY // Here You Can Change UIView To UITextField
        },completion: nil)
    }

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

}