一个更为优雅的解决方案是使用UIView子类（虽然这并不总是合适的），并在父帧更改时重新计算所有子视图（并且要聪明：只有在新帧大小发生更改时才重新计算它们，即在重写setFrame和调用[super setFrame:frame_]之前使用CGRectEqualToRect来比较新帧）。唯一的缺点是，您打算使用的UIViewController可能应该监听键盘事件（或者，您可以在UIView本身中进行监听，以方便封装）。但只有UIKeyboardWillShowNotification和UIKeyboard WillHideNotification。这只是为了让它看起来平滑（如果你等待CG调用它，你会得到一个波涛汹涌的时刻）。

无论如何，这有一个优点，那就是构建一个做正确事情的UIView子类。

天真的实现是重写drawRect:（不要），更好的方法是只使用layoutSubviews（然后在UIViewController中，或者在为显示或隐藏调用的SINGLE方法中调用[view setNeedsLayout]）。

此解决方案摆脱了硬编码键盘偏移（如果它们不在拆分等中，则会发生变化），还意味着您的视图可以是许多其他视图的子视图，并且仍然可以正确响应。

除非没有其他解决方案，否则不要硬编码这样的东西。如果你做得对，操作系统会给你足够的信息，你只需要智能地重新绘制（基于你的新帧大小）。这要干净得多，而且是你应该做的事情。（不过，可能还有更好的方法。）

干杯

在textFieldDidBginEditing和textFieldDidEndEditing中调用函数[self-animateTextField:textField up:YES]，如下所示：

-(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 = -130; // tweak as needed
    const float movementDuration = 0.3f; // tweak as needed

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

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

我希望这段代码对你有所帮助。

雨燕5

func animateTextField(textField: UITextField, up: Bool) {
    
    let movementDistance: CGFloat = -130
    let movementDuration: Double = 0.3
    
    var movement:CGFloat = 0
    if up {
        movement = movementDistance
    } else {
        movement = -movementDistance
    }
    
    UIView.animate(withDuration: movementDuration, delay: 0, options: [.beginFromCurrentState]) {
        self.view.frame = self.view.frame.offsetBy(dx: 0, dy: movement)
    }
}

func textFieldDidBeginEditing(_ textField: UITextField) {
    animateTextField(textField: textField, up: true)
}

func textFieldDidEndEditing(_ textField: UITextField) {
    animateTextField(textField: textField, up: false)
}

我迟到了一点。您应该在viewController上添加scrollView。

您必须实现以下2种方法。

TextField委托方法。

    - (void)textFieldDidBeginEditing:(UIView *)textField {
    [self scrollViewForTextField:reEnterPINTextField];
}

然后在委托方法中调用以下方法。

 - (void)scrollViewForTextField:(UIView *)textField {
    NSInteger keyboardHeight = KEYBOARD_HEIGHT;

    if ([textField UITextField.class]) {
        keyboardHeight += ((UITextField *)textField).keyboardControl.activeField.inputAccessoryView.frame.size.height;
    } 

    CGRect screenFrame = [UIScreen mainScreen].bounds;
    CGRect aRect = (CGRect){0, 0, screenFrame.size.width, screenFrame.size.height - ([UIApplication sharedApplication].statusBarHidden ? 0 : [UIApplication sharedApplication].statusBarFrame.size.height)};
    aRect.size.height -= keyboardHeight;
    CGPoint relativeOrigin = [UIView getOriginRelativeToScreenBounds:textField];
    CGPoint bottomPointOfTextField = CGPointMake(relativeOrigin.x, relativeOrigin.y + textField.frame.size.height);

    if (!CGRectContainsPoint(aRect, bottomPointOfTextField) ) {
        CGPoint scrollPoint = CGPointMake(0.0, bottomPointOfTextField.y -aRect.size.height);
        [contentSlidingView setContentOffset:scrollPoint animated:YES];
    }
}

Shiun表示：“事实证明，我相信UIScrollView实际上隐式地将当前编辑的UITextField带入可视窗口。”这似乎适用于iOS 3.1.3，但不适用于3.2、4.0或4.1。为了使UITextField在iOS上可见，我必须添加一个显式的scrollRectToVisible。

如果您现在的内容不适合iPhone屏幕，您只需要一个ScrollView。（如果您添加ScrollView作为组件的超级视图，只是为了在键盘启动时使TextField向上滚动，那么就不需要了。）防止TextFields被键盘覆盖的标准方法是在显示键盘时向上/向下移动视图。

下面是一些示例代码：

#define kOFFSET_FOR_KEYBOARD 80.0

-(void)keyboardWillShow {
    // Animate the current view out of the way
    if (self.view.frame.origin.y >= 0)
    {
        [self setViewMovedUp:YES];
    }
    else if (self.view.frame.origin.y < 0)
    {
        [self setViewMovedUp:NO];
    }
}

-(void)keyboardWillHide {
    if (self.view.frame.origin.y >= 0)
    {
        [self setViewMovedUp:YES];
    }
    else if (self.view.frame.origin.y < 0)
    {
        [self setViewMovedUp:NO];
    }
}

-(void)textFieldDidBeginEditing:(UITextField *)sender
{
    if ([sender isEqual:mailTf])
    {
        //move the main view, so that the keyboard does not hide it.
        if  (self.view.frame.origin.y >= 0)
        {
            [self setViewMovedUp:YES];
        }
    }
}

//method to move the view up/down whenever the keyboard is shown/dismissed
-(void)setViewMovedUp:(BOOL)movedUp
{
    [UIView beginAnimations:nil context:NULL];
    [UIView setAnimationDuration:0.3]; // if you want to slide up the view

    CGRect rect = self.view.frame;
    if (movedUp)
    {
        // 1. move the view's origin up so that the text field that will be hidden come above the keyboard 
        // 2. increase the size of the view so that the area behind the keyboard is covered up.
        rect.origin.y -= kOFFSET_FOR_KEYBOARD;
        rect.size.height += kOFFSET_FOR_KEYBOARD;
    }
    else
    {
        // revert back to the normal state.
        rect.origin.y += kOFFSET_FOR_KEYBOARD;
        rect.size.height -= kOFFSET_FOR_KEYBOARD;
    }
    self.view.frame = rect;

    [UIView commitAnimations];
}


- (void)viewWillAppear:(BOOL)animated
{
    [super viewWillAppear:animated];
    // register for keyboard notifications
    [[NSNotificationCenter defaultCenter] addObserver:self
                                         selector:@selector(keyboardWillShow)
                                             name:UIKeyboardWillShowNotification
                                           object:nil];

    [[NSNotificationCenter defaultCenter] addObserver:self
                                         selector:@selector(keyboardWillHide)
                                             name:UIKeyboardWillHideNotification
                                           object:nil];
}

- (void)viewWillDisappear:(BOOL)animated
{
    [super viewWillDisappear:animated];
    // unregister for keyboard notifications while not visible.
    [[NSNotificationCenter defaultCenter] removeObserver:self
                                             name:UIKeyboardWillShowNotification
                                           object:nil];

    [[NSNotificationCenter defaultCenter] removeObserver:self
                                             name:UIKeyboardWillHideNotification
                                           object:nil];
}

我已经为自己的需要制定了一个框架，以更好地解决这个问题，并将其公开。它不仅适用于UITextField和UITextView，还适用于采用UITextInput协议的任何自定义UIView，如UITextField或UITextView并提供许多有用的功能。您可以通过Carthage、CocoaPods或Swift Package Manager安装它。

ODScrollView GitHub

ODScrollView中等

ODScrollView只是一个UIScrollView，它根据键盘可见性自动垂直移动UITextField和UITextView等可编辑文本区域，以提供更好的用户体验。

特征

当键盘出现/消失时，自动向上/向下移动采用UITextInput协议的第一响应者UIView，例如UITextField、UITextView、UISearchTextField或任何采用UITextOutput协议的自定义UIView。注意，如果UITextInput的框架不适合ODScrollView和键盘之间的剩余区域，则ODScrollView将根据光标位置而不是框架调整UITextInput。在这种情况下，可以使用“trackTextInputCursor”功能。实例可以分别为每个UITextInput应用调整裕度，用于.顶部和.底部调整方向设置。默认情况下为20 CGFloat。可以分别为每个UITextInput启用/禁用调整。默认情况下为true。调整方向-顶部、中心、底部-可分别应用于每个UITextInput。默认情况下为底部。实例调整选项决定ODScrollView如何调整。始终默认。始终：无论UITextInput是否与显示的键盘重叠，ODScrollView始终调整放置在ODScrollView中任何位置的UITextInput。实例.IfNeedd:ODScrollView仅在UITextInput与显示的键盘重叠时调整UITextInput。实例除了UIScrollView.keyboardDismissModes之外，还可以通过点击ODScrollViewDelegate提供的UIView来关闭键盘。键盘关闭后，ODScrollView可以返回其原始位置。默认情况下为nil和false。实例

用法

1-您需要做的第一件事是正确设置ODScrollView及其内容视图。由于ODScrollView只是一个UIScrollView，所以您可以像对UIScroll View一样实现ODScroll视图。您可以使用故事板或编程方式创建ODScrollView。

如果您以编程方式创建ODScrollView，则可以从步骤4继续。

在情节提要中创建UIScrollView的建议方法

- If you are using Content Layout Guide and Frame Layout Guide:
    1.1 - scrollView: Place UIScrollView anywhere you want to use.  
    1.2 - contentView: Place UIView inside scrollView.
    1.3 - Set contentView's top, bottom, leading and trailing constraints to Content Layout Guide's constraints.
    1.4 - Set contentView's width equal to Frame Layout Guide's width.
    1.5 - Set contentView's height equal to Frame Layout Guide's height or set static height which is larger than scrollView's height.
    1.6 - Build your UI inside contentView.

- If you are NOT using Content Layout Guide and Frame Layout Guide:
    1.1 - scrollView: Place UIScrollView anywhere you want to use.  
    1.2 - contentView: Place UIView inside scrollView.
    1.3 - Set contentView's top, bottom, leading and trailing constraints to 0.
    1.4 - Set contentView's width equal to scrollView's width.
    1.5 - Set contentView's height equal to scrollView's superview's height or set static height which is larger than scrollView's height.
    1.6 - Build your UI inside contentView.

2-在Storyboard上的身份检查器中将scrollView的类从UIScrollView更改为ODScrollView。

3-在ViewController上为scrollView和contentView创建IBOutlets。

4-在ViewController上的ViewDidLoad（）中调用以下方法：

override func viewDidLoad() {
    super.viewDidLoad()

    //ODScrollView setup
    scrollView.registerContentView(contentView)
    scrollView.odScrollViewDelegate = self
}  

5-可选：您仍然可以使用UIScrollView的功能：

override func viewDidLoad() {
    super.viewDidLoad()

    //ODScrollView setup
    scrollView.registerContentView(contentView)
    scrollView.odScrollViewDelegate = self

    // UIScrollView setup
    scrollView.delegate = self // UIScrollView Delegate
    scrollView.keyboardDismissMode = .onDrag // UIScrollView keyboardDismissMode. Default is .none.

    UITextView_inside_contentView.delegate = self
}

6-采用ViewController中的ODScrollViewDelegate并决定ODScrollView选项：

extension ViewController: ODScrollViewDelegate {

    // MARK:- State Notifiers: are responsible for notifiying ViewController about what is going on while adjusting. You don't have to do anything if you don't need them.

    // #Optional
    // Notifies when the keyboard showed.
    func keyboardDidShow(by scrollView: ODScrollView) {}

    // #Optional
    // Notifies before the UIScrollView adjustment.
    func scrollAdjustmentWillBegin(by scrollView: ODScrollView) {}

    // #Optional
    // Notifies after the UIScrollView adjustment.
    func scrollAdjustmentDidEnd(by scrollView: ODScrollView) {}

    // #Optional
    // Notifies when the keyboard hid.
    func keyboardDidHide(by scrollView: ODScrollView) {}

    // MARK:- Adjustment Settings

    // #Optional
    // Specifies the margin between UITextInput and ODScrollView's top or bottom constraint depending on AdjustmentDirection
    func adjustmentMargin(for textInput: UITextInput, inside scrollView: ODScrollView) -> CGFloat {
        if let textField = textInput as? UITextField, textField == self.UITextField_inside_contentView {
            return 20
        } else {
            return 40
        }
    }

    // #Optional
    // Specifies that whether adjustment is enabled or not for each UITextInput seperately.
    func adjustmentEnabled(for textInput: UITextInput, inside scrollView: ODScrollView) -> Bool {
        if let textField = textInput as? UITextField, textField == self.UITextField_inside_contentView {
            return true
        } else {
            return false
        }
    }


    // Specifies adjustment direction for each UITextInput. It means that  some of UITextInputs inside ODScrollView can be adjusted to the bottom, while others can be adjusted to center or top.
    func adjustmentDirection(selected textInput: UITextInput, inside scrollView: ODScrollView) -> AdjustmentDirection {
        if let textField = textInput as? UITextField, textField == self.UITextField_inside_contentView {
            return .bottom
        } else {
            return .center
        }
    }

    /**
     - Always : ODScrollView always adjusts the UITextInput which is placed anywhere in the ODScrollView.
     - IfNeeded : ODScrollView only adjusts the UITextInput if it overlaps with the shown keyboard.
     */
    func adjustmentOption(for scrollView: ODScrollView) -> AdjustmentOption {
        .Always
    }

    // MARK: - Hiding Keyboard Settings

    /**
     #Optional

     Provides a view for tap gesture that hides keyboard.

     By default, keyboard can be dismissed by keyboardDismissMode of UIScrollView.

     keyboardDismissMode = .none
     keyboardDismissMode = .onDrag
     keyboardDismissMode = .interactive

     Beside above settings:

     - Returning UIView from this, lets you to hide the keyboard by tapping the UIView you provide, and also be able to use isResettingAdjustmentEnabled(for scrollView: ODScrollView) setting.

     - If you return nil instead of UIView object, It means that hiding the keyboard by tapping is disabled.
     */
    func hideKeyboardByTappingToView(for scrollView: ODScrollView) -> UIView? {
        self.view
    }

    /**
     #Optional

     Resets the scroll view offset - which is adjusted before - to beginning its position after keyboard hid by tapping to the provided UIView via hideKeyboardByTappingToView.

     ## IMPORTANT:
     This feature requires a UIView that is provided by hideKeyboardByTappingToView().
     */
    func isResettingAdjustmentEnabled(for scrollView: ODScrollView) -> Bool {
        true
    }
}

7-可选：当在多行UITextInput中键入时光标与键盘重叠时，可以调整ODScrollView。trackTextInputCursor（用于UITextInput）必须由键入时激发的UITextInput函数调用。

/**
## IMPORTANT:
This feature is not going to work unless textView is subView of _ODScrollView
*/
func textView(_ textView: UITextView, shouldChangeTextIn range: NSRange, replacementText text: String) -> Bool {
       _ODScrollView.trackTextInputCursor(for textView)
   return true
}