使用 Swift 使用键盘移动视图

Question

我有一个应用程序，它在视图的下半部分有一个文本字段。 这意味着当我输入文本字段时，键盘会覆盖文本字段。

我将如何在打字时向上移动视图，以便我可以看到我正在输入的内容，然后在键盘消失时将其移回原来的位置？

我到处寻找，但所有解决方案似乎都在 Obj-C 中，我还不能完全转换。

任何帮助将不胜感激。

Answer 1

这是一个解决方案，无需处理从一个文本字段到另一个文本字段的切换：

override func viewDidLoad() {
        super.viewDidLoad()
        NSNotificationCenter.defaultCenter().addObserver(self, selector: Selector("keyboardWillShow:"), name: UIKeyboardWillShowNotification, object: nil)
        NSNotificationCenter.defaultCenter().addObserver(self, selector: Selector("keyboardWillHide:"), name: UIKeyboardWillHideNotification, object: nil)            
    }   

func keyboardWillShow(notification: NSNotification) {            
    if let keyboardSize = (notification.userInfo?[UIKeyboardFrameEndUserInfoKey] as? NSValue)?.CGRectValue() {
        self.view.frame.origin.y -= keyboardSize.height
    }            
}

func keyboardWillHide(notification: NSNotification) {
    self.view.frame.origin.y = 0
}

要解决这个问题，请将两个函数 keyboardWillShow/Hide 替换为：

func keyboardWillShow(notification: NSNotification) {        
    if let keyboardSize = (notification.userInfo?[UIKeyboardFrameEndUserInfoKey] as? NSValue)?.CGRectValue() {
        if view.frame.origin.y == 0 {
            self.view.frame.origin.y -= keyboardSize.height
        }
    }        
}

func keyboardWillHide(notification: NSNotification) {
    if view.frame.origin.y != 0 {
        self.view.frame.origin.y = 0
    }
}

斯威夫特 3.0：

override func viewDidLoad() {
    super.viewDidLoad()            
    NotificationCenter.default.addObserver(self, selector: #selector(ViewController.keyboardWillShow), name: NSNotification.Name.UIKeyboardWillShow, object: nil)
    NotificationCenter.default.addObserver(self, selector: #selector(ViewController.keyboardWillHide), name: NSNotification.Name.UIKeyboardWillHide, object: nil)    
}

@objc func keyboardWillShow(notification: NSNotification) {        
    if let keyboardSize = (notification.userInfo?[UIKeyboardFrameEndUserInfoKey] as? NSValue)?.cgRectValue {
        if self.view.frame.origin.y == 0 {
            self.view.frame.origin.y -= keyboardSize.height
        }
    }        
}

@objc func keyboardWillHide(notification: NSNotification) {
    if self.view.frame.origin.y != 0 {
        self.view.frame.origin.y = 0
    }
}
    

斯威夫特 4.0：

override func viewDidLoad() {
    super.viewDidLoad()            
    NotificationCenter.default.addObserver(self, selector: #selector(ViewController.keyboardWillShow), name: NSNotification.Name.UIKeyboardWillShow, object: nil)
    NotificationCenter.default.addObserver(self, selector: #selector(ViewController.keyboardWillHide), name: NSNotification.Name.UIKeyboardWillHide, object: nil)    
}

@objc func keyboardWillShow(notification: NSNotification) {        
    if let keyboardSize = (notification.userInfo?[UIKeyboardFrameEndUserInfoKey] as? NSValue)?.cgRectValue {
        if self.view.frame.origin.y == 0 {
            self.view.frame.origin.y -= keyboardSize.height
        }
    }        
}

@objc func keyboardWillHide(notification: NSNotification) {
    if self.view.frame.origin.y != 0 {
        self.view.frame.origin.y = 0
    }
}

斯威夫特 4.2：

override func viewDidLoad() {
    super.viewDidLoad()            
    NotificationCenter.default.addObserver(self, selector: #selector(keyboardWillShow), name: UIResponder.keyboardWillShowNotification, object: nil)
    NotificationCenter.default.addObserver(self, selector: #selector(keyboardWillHide), name: UIResponder.keyboardWillHideNotification, object: nil)
}

@objc func keyboardWillShow(notification: NSNotification) {
    if let keyboardSize = (notification.userInfo?[UIResponder.keyboardFrameEndUserInfoKey] as? NSValue)?.cgRectValue {
        if self.view.frame.origin.y == 0 {
            self.view.frame.origin.y -= keyboardSize.height
        }
    }
}

@objc func keyboardWillHide(notification: NSNotification) {
    if self.view.frame.origin.y != 0 {
        self.view.frame.origin.y = 0
    }
}

Answer 2

甚至不需要任何代码的最简单方法：

1. 如果您尚未使用 Spring 动画框架，请下载 KeyboardLayoutConstraint.swift 并将文件添加（拖放）到您的项目中。
2. 在情节提要中，为 View 或 Textfield 创建底部约束，选择约束（双击它）并在 Identity Inspector 中，将其类从 NSLayoutConstraint 更改为 KeyboardLayoutConstraint。
3. 完成！

对象将与键盘同步自动向上移动。

Answer 3

此线程上的一个流行答案使用以下代码：

func keyboardWillShow(sender: NSNotification) {
    self.view.frame.origin.y -= 150
}
func keyboardWillHide(sender: NSNotification) {
    self.view.frame.origin.y += 150
}

将您的视图偏移一个静态量有一个明显的问题。它在一台设备上看起来不错，但在任何其他尺寸配置上看起来都不好。您需要获取键盘高度并将其用作偏移值。

这是一个适用于所有设备的解决方案，可以处理用户在键入时隐藏预测文本字段的极端情况。

解决方案

需要注意的是，我们将 self.view.window 作为对象参数传入。这将为我们提供来自键盘的数据，例如它的高度！

@IBOutlet weak var messageField: UITextField!

override func viewDidLoad() {
    super.viewDidLoad()

    NSNotificationCenter.defaultCenter().addObserver(self, selector: Selector("keyboardWillShow:"), name:UIKeyboardWillShowNotification, object: self.view.window)
    NSNotificationCenter.defaultCenter().addObserver(self, selector: Selector("keyboardWillHide:"), name:UIKeyboardWillHideNotification, object: self.view.window)
}

func keyboardWillHide(sender: NSNotification) {
    let userInfo: [NSObject : AnyObject] = sender.userInfo!
    let keyboardSize: CGSize = userInfo[UIKeyboardFrameBeginUserInfoKey]!.CGRectValue.size
    self.view.frame.origin.y += keyboardSize.height
}

我们将使它在所有设备上看起来都很好，并处理用户添加或删除预测文本字段的情况。

func keyboardWillShow(sender: NSNotification) {
    let userInfo: [NSObject : AnyObject] = sender.userInfo!
    let keyboardSize: CGSize = userInfo[UIKeyboardFrameBeginUserInfoKey]!.CGRectValue.size
    let offset: CGSize = userInfo[UIKeyboardFrameEndUserInfoKey]!.CGRectValue.size

    if keyboardSize.height == offset.height {
        UIView.animateWithDuration(0.1, animations: { () -> Void in
            self.view.frame.origin.y -= keyboardSize.height
        })
    } else {
        UIView.animateWithDuration(0.1, animations: { () -> Void in
            self.view.frame.origin.y += keyboardSize.height - offset.height
        })
    }
}

移除观察者

在离开视图之前不要忘记移除观察者，以防止传输不必要的消息。

override func viewWillDisappear(animated: Bool) {
    NSNotificationCenter.defaultCenter().removeObserver(self, name: UIKeyboardWillShowNotification, object: self.view.window)
    NSNotificationCenter.defaultCenter().removeObserver(self, name: UIKeyboardWillHideNotification, object: self.view.window)
}

---

根据来自 cmets 的问题更新：

如果您有两个或更多文本字段，您可以检查 view.frame.origin.y 是否为零。

func keyboardWillShow(sender: NSNotification) {
    let userInfo: [NSObject : AnyObject] = sender.userInfo!

    let keyboardSize: CGSize = userInfo[UIKeyboardFrameBeginUserInfoKey]!.CGRectValue.size
    let offset: CGSize = userInfo[UIKeyboardFrameEndUserInfoKey]!.CGRectValue.size

    if keyboardSize.height == offset.height {
        if self.view.frame.origin.y == 0 {
            UIView.animateWithDuration(0.1, animations: { () -> Void in
                self.view.frame.origin.y -= keyboardSize.height
            })
        }
    } else {
        UIView.animateWithDuration(0.1, animations: { () -> Void in
            self.view.frame.origin.y += keyboardSize.height - offset.height
        })
    }
     print(self.view.frame.origin.y)
}

Answer 4

不是广告、促销或垃圾邮件，只是一个很好的解决方案。我知道这个问题有近 30 个答案，我很震惊，甚至没有人提到过一次关于 this beautiful GitHub project 的事情，这一切都对你有用，甚至更好。所有的答案只是向上移动视图。我刚刚用这个 IQKeyboardManager 解决了我所有的问题。它有13000+颗星。
如果您使用 swift，只需将其添加到您的 podfile 中

pod 'IQKeyboardManagerSwift'

然后在您的 AppDelegate.swift 中执行 import IQKeyboardManagerSwift

import IQKeyboardManagerSwift

@UIApplicationMain
class AppDelegate: UIResponder, UIApplicationDelegate {

    var window: UIWindow?

    func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: [NSObject: AnyObject]?) -> Bool {

      IQKeyboardManager.shared.enable = true // just add this line

      return true
    }
}

添加行 IQKeyboardManager.shared.enable = true 以启用它
如果您要进行生产，此解决方案是必须的。

Answer 5

我对其中一个答案进行了一些改进，使其可以在一个页面上使用不同的键盘和不同的文本视图/字段：

添加观察者：

override func viewWillAppear(_ animated: Bool) {
    super.viewWillAppear(animated)

    NotificationCenter.default.addObserver(self, selector: #selector(keyboardWillChange(notification:)), name: UIResponder.keyboardWillChangeFrameNotification, object: nil)

    NotificationCenter.default.addObserver(self, selector: #selector(keyboardWillHide), name: UIResponder.keyboardWillHideNotification, object: nil)
}

func keyboardWillHide() {
    self.view.frame.origin.y = 0
}

func keyboardWillChange(notification: NSNotification) {

    if let keyboardSize = (notification.userInfo?[UIResponder.keyboardFrameEndUserInfoKey] as? NSValue)?.cgRectValue {
        if YOURTEXTVIEW.isFirstResponder {
            self.view.frame.origin.y = -keyboardSize.height
        }
    }
}

移除观察者：

override func viewWillDisappear(_ animated: Bool) {
    super.viewWillDisappear(animated)

    NotificationCenter.default.removeObserver(self, name: UIResponder.keyboardWillChangeFrameNotification, object: nil)
    NotificationCenter.default.removeObserver(self, name: UIResponder.keyboardWillHideNotification, object: nil)
}

Answer 6

将此添加到您的视图控制器。奇迹般有效。只需调整值。

override func viewDidLoad() {
    super.viewDidLoad()        
    NotificationCenter.default.addObserver(self, selector: #selector(keyboardWillShow), name:NSNotification.Name.UIKeyboardWillShow, object: nil);
    NotificationCenter.default.addObserver(self, selector: #selector(keyboardWillHide), name:NSNotification.Name.UIKeyboardWillHide, object: nil);
}

@objc func keyboardWillShow(sender: NSNotification) {
    self.view.frame.origin.y -= 150
}
@objc func keyboardWillHide(sender: NSNotification) {
    self.view.frame.origin.y += 150
}

Answer 7

Swift 5.0：

经过 4-5 小时的战斗，我用简单的代码对 UIViewController 进行了简单的扩展，就像魅力一样工作

*当 TextField 位于键盘上方时，视图不应移动

*NSLayoutConstraint不需要设置常量

*不需要第三方库

*无需动画代码

*也适用于 tableview

*这适用于自动布局/自动调整大小

extension UIViewController {
    func addKeyboardObserver() {
        NotificationCenter.default.addObserver(self, selector: #selector(keyboardNotifications(notification:)),
                                               name: UIResponder.keyboardWillChangeFrameNotification,
                                               object: nil)
    }

    func removeKeyboardObserver(){
        NotificationCenter.default.removeObserver(self, name: UIResponder.keyboardWillChangeFrameNotification, object: nil)
    }

    // This method will notify when keyboard appears/ dissapears
    @objc func keyboardNotifications(notification: NSNotification) {

        var txtFieldY : CGFloat = 0.0  //Using this we will calculate the selected textFields Y Position
        let spaceBetweenTxtFieldAndKeyboard : CGFloat = 5.0 //Specify the space between textfield and keyboard


        var frame = CGRect(x: 0, y: 0, width: 0, height: 0)
        if let activeTextField = UIResponder.currentFirst() as? UITextField ?? UIResponder.currentFirst() as? UITextView {
            // Here we will get accurate frame of textField which is selected if there are multiple textfields
            frame = self.view.convert(activeTextField.frame, from:activeTextField.superview)
            txtFieldY = frame.origin.y + frame.size.height
        }

        if let userInfo = notification.userInfo {
            // here we will get frame of keyBoard (i.e. x, y, width, height)
            let keyBoardFrame = (userInfo[UIResponder.keyboardFrameEndUserInfoKey] as? NSValue)?.cgRectValue
            let keyBoardFrameY = keyBoardFrame!.origin.y
            let keyBoardFrameHeight = keyBoardFrame!.size.height

            var viewOriginY: CGFloat = 0.0
            //Check keyboards Y position and according to that move view up and down
            if keyBoardFrameY >= UIScreen.main.bounds.size.height {
                viewOriginY = 0.0
            } else {
                // if textfields y is greater than keyboards y then only move View to up
                if txtFieldY >= keyBoardFrameY {

                    viewOriginY = (txtFieldY - keyBoardFrameY) + spaceBetweenTxtFieldAndKeyboard

                    //This condition is just to check viewOriginY should not be greator than keyboard height
                    // if its more than keyboard height then there will be black space on the top of keyboard.
                    if viewOriginY > keyBoardFrameHeight { viewOriginY = keyBoardFrameHeight }
                }
            }

            //set the Y position of view
            self.view.frame.origin.y = -viewOriginY
        }
    }
}

添加 UIResponder 的这个 Extension 以获取选中的 TextField

extension UIResponder {

    static weak var responder: UIResponder?

    static func currentFirst() -> UIResponder? {
        responder = nil
        UIApplication.shared.sendAction(#selector(trap), to: nil, from: nil, for: nil)
        return responder
    }

    @objc private func trap() {
        UIResponder.responder = self
    }
}

然后在你的任何 ViewController 中使用它

   override func viewWillAppear(_ animated: Bool) {
        self.addKeyboardObserver()
    }

    override func viewWillDisappear(_ animated: Bool) {
        self.removeKeyboardObserver()
    }

---

• 在func viewWillAppear(_ animated: Bool)注册此通知

• 在func viewWillDisappear(_ animated:Bool)注销此通知

  Download Demo Here

Answer 8

我看到所有答案都是通过键盘高度的值移动视图本身。好吧，我有一个详尽的答案，如果您使用约束，即autolayout，这可能很有用，它通过将其约束值（例如底部或顶部约束）更改为预定义值来移动视图，或者您可以使用键盘大小值.

在本例中，我使用从文本字段到底部布局视图的底部约束，初始值为 175。

@IBOutlet weak var bottomConstraint: NSLayoutConstraint!

override func viewDidLoad() {
    super.viewDidLoad()        
    NSNotificationCenter.defaultCenter().addObserver(self, selector: Selector("keyboardWillShow:"), name:UIKeyboardWillShowNotification, object: nil);
    NSNotificationCenter.defaultCenter().addObserver(self, selector: Selector("keyboardWillHide:"), name:UIKeyboardWillHideNotification, object: nil);
}

func keyboardWillShow(notification: NSNotification) {
    //To retrieve keyboard size, uncomment following line
    //let keyboardSize = (notification.userInfo?[UIKeyboardFrameBeginUserInfoKey] as? NSValue)?.CGRectValue()
    bottomConstraint.constant = 260
    UIView.animateWithDuration(0.3) {
        self.view.layoutIfNeeded()
    }
}

func keyboardWillHide(notification: NSNotification) {
    //To retrieve keyboard size, uncomment following line
    //let keyboardSize = (notification.userInfo?[UIKeyboardFrameBeginUserInfoKey] as? NSValue)?.CGRectValue()
    bottomConstraint.constant = 175
    UIView.animateWithDuration(0.3) {
        self.view.layoutIfNeeded()
    }
}

Answer 9

对于黑屏错误 （Swift 4 & 4.2）。

我修复了黑屏问题。在经过验证的解决方案中，点击后键盘高度会发生变化，这会导致黑屏。

必须使用 UIKeyboardFrameEndUserInfoKey 而不是 UIKeyboardFrameBeginUserInfoKey

var isKeyboardAppear = false

override func viewDidLoad() {
    super.viewDidLoad() 
    NotificationCenter.default.addObserver(self, selector: #selector(keyboardWillShow), name: NSNotification.Name.UIKeyboardWillShow, object: nil)
    NotificationCenter.default.addObserver(self, selector: #selector(keyboardWillHide), name: NSNotification.Name.UIKeyboardWillHide, object: nil)
}

@objc func keyboardWillShow(notification: NSNotification) {
    if !isKeyboardAppear {
        if let keyboardSize = (notification.userInfo?[UIKeyboardFrameEndUserInfoKey] as? NSValue)?.cgRectValue {
            if self.view.frame.origin.y == 0{
                self.view.frame.origin.y -= keyboardSize.height
            }
        }
        isKeyboardAppear = true
    }
}

@objc func keyboardWillHide(notification: NSNotification) {
    if isKeyboardAppear {
        if let keyboardSize = (notification.userInfo?[UIKeyboardFrameEndUserInfoKey] as? NSValue)?.cgRectValue {
            if self.view.frame.origin.y != 0{
                self.view.frame.origin.y += keyboardSize.height
            }
        }
         isKeyboardAppear = false
    }
}

Answer 10

我们定义 KeyboardWillHideNotification 的方式发生了一些变化。

此解决方案适用于 Swift 4.2：

NotificationCenter.default.addObserver(self, selector: #selector(ViewController.keyboardWillShow), name: UIResponder.keyboardWillShowNotification, object: nil)
NotificationCenter.default.addObserver(self, selector: #selector(ViewController.keyboardWillHide), name: UIResponder.keyboardWillHideNotification, object: nil)


@objc func keyboardWillShow(_ notification:Notification) {
    if let keyboardSize = (notification.userInfo?[UIResponder.keyboardFrameEndUserInfoKey] as? NSValue)?.cgRectValue {
        self.view.frame.origin.y -= keyboardSize.height
    }
}

@objc func keyboardWillHide(_ notification:Notification) {
    if let keyboardSize = (notification.userInfo?[UIResponder.keyboardFrameBeginUserInfoKey] as? NSValue)?.cgRectValue {
        self.view.frame.origin.y += keyboardSize.height
    }
}

Answer 11

对于 Swift 3，我创建了一个 UIViewController 子类，因为我需要在所有视图控制器中保持一致的行为。

class SomeClassVC: UIViewController {

  //MARK: - Lifecycle
  override func viewDidLoad() {
    super.viewDidLoad()

    addKeyboardObservers()
  }

  override func viewWillDisappear(_ animated: Bool) {
    super.viewWillDisappear(animated)

    removeKeyboardObservers()
  }

  //MARK: - Overrides
  override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
    view.endEditing(true)
  }

  //MARK: - Help
  func addKeyboardObservers() {
    NotificationCenter.default.addObserver(self, selector: #selector(self.keyboardWillShow), name: NSNotification.Name.UIKeyboardWillShow, object: nil)
    NotificationCenter.default.addObserver(self, selector: #selector(self.keyboardWillHide), name: NSNotification.Name.UIKeyboardWillHide, object: nil)
  }

  func removeKeyboardObservers() {
    NotificationCenter.default.removeObserver(self, name: NSNotification.Name.UIKeyboardWillShow, object: self.view.window)
    NotificationCenter.default.removeObserver(self, name: NSNotification.Name.UIKeyboardWillHide, object: self.view.window)
  }

  func keyboardWillShow(notification: NSNotification) {
    let keyboardHeight = (notification.userInfo?[UIKeyboardFrameBeginUserInfoKey] as? NSValue)?.cgRectValue.height
    UIView.animate(withDuration: 0.1, animations: { () -> Void in
      self.view.window?.frame.origin.y = -1 * keyboardHeight!
      self.view.layoutIfNeeded()
    })
  }

  func keyboardWillHide(notification: NSNotification) {
    UIView.animate(withDuration: 0.1, animations: { () -> Void in
      self.view.window?.frame.origin.y = 0
      self.view.layoutIfNeeded()
    })
  }

  func resignTextFieldFirstResponders() {
    for textField in self.view.subviews where textField is UITextField {
      textField.resignFirstResponder()
    }
  }

  func resignAllFirstResponders() {
      view.endEditing(true)
  }
}

Answer 12

经过验证的答案没有考虑文本字段位置并且有一些错误（双位移，永远不会回到主要位置，即使 texfield 位于视图顶部也位移.. .)

想法是：

• 获取焦点TextField的绝对Y位置
• 获取键盘高度
• 获取 ScreenHeight
• 然后计算键盘位置和文本域之间的距离（如果 向上移动视图）
• 使用 UIView.transform 而不是 UIView.frame.origin.y -= ..，因为使用 UIView.transform = .identity 更容易回到原始位置

然后我们将能够仅在必要时移动视图以及特定位移，以便将焦点 texField 放在键盘上方

代码如下：

斯威夫特 4

class ViewController: UIViewController, UITextFieldDelegate {

var textFieldRealYPosition: CGFloat = 0.0

override func viewDidLoad() {
    super.viewDidLoad()

    NotificationCenter.default.addObserver(self, selector: #selector(VehiculeViewController.keyboardWillShow), name: NSNotification.Name.UIKeyboardWillShow, object: nil)
    NotificationCenter.default.addObserver(self, selector: #selector(VehiculeViewController.keyboardWillHide), name: NSNotification.Name.UIKeyboardWillHide, object: nil)

  // Delegate all textfields

}


@objc func keyboardWillShow(notification: NSNotification) {
    if let keyboardSize = (notification.userInfo?[UIKeyboardFrameBeginUserInfoKey] as? NSValue)?.cgRectValue {
        let distanceBetweenTextfielAndKeyboard = self.view.frame.height - textFieldRealYPosition - keyboardSize.height
        if distanceBetweenTextfielAndKeyboard < 0 {
            UIView.animate(withDuration: 0.4) {
                self.view.transform = CGAffineTransform(translationX: 0.0, y: distanceBetweenTextfielAndKeyboard)
            }
        }
    }
}


@objc func keyboardWillHide(notification: NSNotification) {
    UIView.animate(withDuration: 0.4) {
        self.view.transform = .identity
    }
}


func textFieldDidBeginEditing(_ textField: UITextField) {
  textFieldRealYPosition = textField.frame.origin.y + textField.frame.height
  //take in account all superviews from textfield and potential contentOffset if you are using tableview to calculate the real position
}

}

Answer 13

所以其他答案似乎都没有正确。

iOS 上的良好行为键盘应该：

• 当键盘改变大小时自动调整大小（可以）
• 以与键盘相同的速度制作动画
• 使用与键盘相同的曲线制作动画
• 如果相关，请尊重安全区域。
• 也适用于 iPad/Undocking 模式

我的代码使用NSLayoutConstraint 声明为@IBOutlet

@IBOutlet private var bottomLayoutConstraint: NSLayoutConstraint!

您还可以使用变换、视图偏移，...。我认为使用约束会更容易。它通过将约束设置到底部来工作，如果您的常量不是 0/Not to the bottom，您可能需要更改代码。

代码如下：

// In ViewDidLoad
    NotificationCenter.default.addObserver(self, selector: #selector(?MyViewController.keyboardDidChange), name: UIResponder.keyboardWillChangeFrameNotification, object: nil)


@objc func keyboardDidChange(notification: Notification) {
    let userInfo = notification.userInfo! as [AnyHashable: Any]
    let endFrame = (userInfo[UIResponder.keyboardFrameEndUserInfoKey] as! NSValue).cgRectValue
    let animationDuration = userInfo[UIResponder.keyboardAnimationDurationUserInfoKey] as! NSNumber
    let animationCurve = userInfo[UIResponder.keyboardAnimationCurveUserInfoKey] as! NSNumber
    bottomLayoutConstraint.constant = view.frame.height - endFrame.origin.y - view.safeAreaInsets.bottom // If your constraint is not defined as a safeArea constraint you might want to skip the last part.
    // Prevents iPad undocked keyboard.
    guard endFrame.height != 0, view.frame.height == endFrame.height + endFrame.origin.y else {
        bottomLayoutConstraint.constant = 0
        return
    }
    UIView.setAnimationCurve(UIView.AnimationCurve(rawValue: animationCurve.intValue)!)
    UIView.animate(withDuration: animationDuration.doubleValue) {
        self.view.layoutIfNeeded()
        // Do additional tasks such as scrolling in a UICollectionView
    }
}

Answer 14

我注意到其他答案涉及从视图中切割一些顶部。如果你想简单地调整视图大小而不剪切任何内容，试试这个方法:)

func keyboardWillShow(notification: NSNotification) {
    if let keyboardSize = (notification.userInfo?[UIKeyboardFrameBeginUserInfoKey] as? NSValue)?.CGRectValue() {
        self.view.setTranslatesAutoresizingMaskIntoConstraints(true)
        self.view.frame = CGRectMake(self.view.frame.origin.x, self.view.frame.origin.y, self.view.frame.size.width, self.view.frame.height - keyboardSize.height)
    }
}

func keyboardWillHide(notification: NSNotification) {
    if let keyboardSize = (notification.userInfo?[UIKeyboardFrameBeginUserInfoKey] as? NSValue)?.CGRectValue() {
        self.collectionView.setTranslatesAutoresizingMaskIntoConstraints(false)
        self.view.frame = CGRectMake(self.view.frame.origin.x, self.view.frame.origin.y, self.view.frame.size.width, self.view.frame.height + keyboardSize.height)
    }
}

Answer 15

我给初学者的两分钱： 在上面的示例中，有人更改了坐标、其他使用“自动调整大小掩码”和其他约束：

正如苹果所说，不要混合这三种逻辑。 如果您在 Storyboard 中有约束，请不要尝试更改 x/y。它绝对不起作用。

Answer 16

类似于@Boris 的回答，但在 Swift 5 中：

override func viewDidLoad() {
    NotificationCenter.default.addObserver(self, selector: #selector(keyboardWillShow), name: UIResponder.keyboardWillShowNotification, object: nil)
    NotificationCenter.default.addObserver(self, selector: #selector(keyboardWillHide), name: UIResponder.keyboardWillHideNotification, object: nil)
}

@IBAction func keyboardWillShow(notification: NSNotification) {
    if let keyboardSize = (notification.userInfo?[UIResponder.keyboardFrameBeginUserInfoKey] as? NSValue)?.cgRectValue {
        if self.view.frame.origin.y == 0 {
            self.view.frame.origin.y -= keyboardSize.height
        }
    }
}

@IBAction func keyboardWillHide(notification: NSNotification) {
    if self.view.frame.origin.y != 0 {
        self.view.frame.origin.y = 0
    }
}

Answer 17

对于 Swift 3

func textFieldDidBeginEditing(_ textField: UITextField) { // became first responder

    //move textfields up
    let myScreenRect: CGRect = UIScreen.main.bounds
    let keyboardHeight : CGFloat = 216

    UIView.beginAnimations( "animateView", context: nil)
    var movementDuration:TimeInterval = 0.35
    var needToMove: CGFloat = 0

    var frame : CGRect = self.view.frame
    if (textField.frame.origin.y + textField.frame.size.height + UIApplication.shared.statusBarFrame.size.height > (myScreenRect.size.height - keyboardHeight - 30)) {
        needToMove = (textField.frame.origin.y + textField.frame.size.height + UIApplication.shared.statusBarFrame.size.height) - (myScreenRect.size.height - keyboardHeight - 30);
    }

    frame.origin.y = -needToMove
    self.view.frame = frame
    UIView.commitAnimations()
}

func textFieldDidEndEditing(_ textField: UITextField) {
    //move textfields back down
    UIView.beginAnimations( "animateView", context: nil)
    var movementDuration:TimeInterval = 0.35
    var frame : CGRect = self.view.frame
    frame.origin.y = 0
    self.view.frame = frame
    UIView.commitAnimations()
}

Answer 18

当打开键盘时，它对所有 Guy 的更新 Tableview 高度的 100% 完美答案

对于 Swift4.2

   override func viewDidLoad() {
      super.viewDidLoad()
      NotificationCenter.default.addObserver(self, selector: #selector(RecipeVC.keyboardWillShow), name: UIResponder.keyboardWillShowNotification, object: nil)

      NotificationCenter.default.addObserver(self, selector: #selector(RecipeVC.keyboardWillHide), name: UIResponder.keyboardWillHideNotification, object: nil)
   }

   @objc func keyboardWillShow(notification: NSNotification) {
    if ((notification.userInfo?[UIResponder.keyboardFrameBeginUserInfoKey] as? NSValue)?.cgRectValue) != nil {

        var userInfo = notification.userInfo!
        var keyboardFrame:CGRect = (userInfo[UIResponder.keyboardFrameEndUserInfoKey] as! NSValue).cgRectValue
        keyboardFrame = self.view.convert(keyboardFrame, from: nil)

        var contentInset:UIEdgeInsets = self.tbl.contentInset
          contentInset.bottom = keyboardFrame.size.height
          self.tbl.contentInset = contentInset
    }
}

   @objc func keyboardWillHide(notification: NSNotification) {
    if ((notification.userInfo?[UIResponder.keyboardFrameEndUserInfoKey] as? NSValue)?.cgRectValue) != nil {
        let contentInset:UIEdgeInsets = UIEdgeInsets(top: 0, left: 0, bottom: 0, right: 0)
        self.tbl.contentInset = contentInset
    }
}

Swift3.2

    override func viewDidLoad() {
          super.viewDidLoad()

           NotificationCenter.default.addObserver(self, selector: #selector(RecipeVC.keyboardWillShow), name: NSNotification.Name.UIKeyboardWillShow, object: nil)

           NotificationCenter.default.addObserver(self, selector: #selector(RecipeVC.keyboardWillHide), name: NSNotification.Name.UIKeyboardWillHide, object: nil)
    }
    func keyboardWillShow(notification: NSNotification) {
         if ((notification.userInfo?[UIKeyboardFrameBeginUserInfoKey] as? NSValue)?.cgRectValue) != nil {
         //self.view.frame.origin.y -= keyboardSize.height
         var userInfo = notification.userInfo!
         var keyboardFrame:CGRect = (userInfo[UIKeyboardFrameEndUserInfoKey] as! NSValue).cgRectValue
          keyboardFrame = self.view.convert(keyboardFrame, from: nil)

          var contentInset:UIEdgeInsets = self.tbl.contentInset
          contentInset.bottom = keyboardFrame.size.height
          self.tbl.contentInset = contentInset

       }
    }

    func keyboardWillHide(notification: NSNotification) {
         if ((notification.userInfo?[UIKeyboardFrameEndUserInfoKey] as? NSValue)?.cgRectValue) != nil {
         let contentInset:UIEdgeInsets = UIEdgeInsets(top: 0, left: 0, bottom: 0, right: 0)
         self.tbl.contentInset = contentInset
         }
    }

Answer 19

斯威夫特 4：

我在接受最多的答案时遇到了问题，其中隐藏键盘并没有将视图一直返回到页面底部（仅部分）。这对我有用（+为 Swift 4 更新）。

override func viewDidLoad() {
    super.viewDidLoad()
    self.hideKeyboardWhenTappedAround()
    NotificationCenter.default.addObserver(self, selector: #selector(keyboardWillShow), name: NSNotification.Name.UIKeyboardWillShow, object: nil)
    NotificationCenter.default.addObserver(self, selector: #selector(keyboardWillHide), name: NSNotification.Name.UIKeyboardWillHide, object: nil)
}

@objc func keyboardWillShow(notification: NSNotification) {
    if let keyboardSize = (notification.userInfo?[UIKeyboardFrameBeginUserInfoKey] as? NSValue)?.cgRectValue {
        if self.view.frame.origin.y == 0{
            self.view.frame.origin.y -= keyboardSize.height
        }
    }
}

@objc func keyboardWillHide(notification: NSNotification) {
    if let keyboardSize = (notification.userInfo?[UIKeyboardFrameBeginUserInfoKey] as? NSValue)?.cgRectValue {
        if self.view.frame.origin.y != 0{
            self.view.frame.origin.y = 0
        }
    }
}

Answer 20

这是我的解决方案（实际上，此代码适用于视图中文本字段较少的情况，也适用于只有一个文本字段的情况）

class MyViewController: UIViewController, UITextFieldDelegate {

@IBOutlet weak var firstTextField: UITextField!
@IBOutlet weak var secondTextField: UITextField!

var activeTextField: UITextField!
var viewWasMoved: Bool = false


override func viewDidLoad() {
    super.viewDidLoad()
    NSNotificationCenter.defaultCenter().addObserver(self, selector: #selector(PrintViewController.keyboardWillShow(_:)), name: UIKeyboardWillShowNotification, object: nil)
    NSNotificationCenter.defaultCenter().addObserver(self, selector: #selector(PrintViewController.keyboardWillHide(_:)), name: UIKeyboardWillHideNotification, object: nil)
}

override func viewDidDisappear(animated: Bool) {
    super.viewWillDisappear(animated)
    NSNotificationCenter.defaultCenter().removeObserver(self)
}

func textFieldDidBeginEditing(textField: UITextField) {
    self.activeTextField = textField
}

func textFieldDidEndEditing(textField: UITextField) {
    self.activeTextField = nil
}

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


func keyboardWillShow(notification: NSNotification) {

    let keyboardSize = (notification.userInfo?[UIKeyboardFrameBeginUserInfoKey] as? NSValue)?.CGRectValue()

    var aRect: CGRect = self.view.frame
    aRect.size.height -= keyboardSize!.height

    let activeTextFieldRect: CGRect? = activeTextField?.frame
    let activeTextFieldOrigin: CGPoint? = activeTextFieldRect?.origin

    if (!CGRectContainsPoint(aRect, activeTextFieldOrigin!)) {
        self.viewWasMoved = true
        self.view.frame.origin.y -= keyboardSize!.height
    } else {
        self.viewWasMoved = false
    }
}

func keyboardWillHide(notification: NSNotification) {
    if (self.viewWasMoved) {
        if let keyboardSize = (notification.userInfo?[UIKeyboardFrameBeginUserInfoKey] as? NSValue)?.CGRectValue() {
            self.view.frame.origin.y += keyboardSize.height
        }
    }
}

Answer 21

为 Swift 3 更新...

正如其他人所说，您需要在控制器的 viewDidLoad() 方法中添加通知观察者，如下所示：

NotificationCenter.default.addObserver(forName: .UIKeyboardWillShow, object: nil, queue: nil)
    { notification in
    self.keyboardWillShow(notification)
    }

NotificationCenter.default.addObserver(forName: .UIKeyboardWillHide, object: nil, queue: nil)
    { notification in
    self.keyboardWillHide(notification)
    }

NotificationCenter.default.addObserver(forName: .UIKeyboardDidShow, object: nil, queue: nil)
    { _ in
    self.enableUserInteraction()
    }

NotificationCenter.default.addObserver(forName: .UIKeyboardDidHide, object: nil, queue: nil)
    { _ in
    self.enableUserInteraction()
    }

记得在适当的地方删除你的观察者（我在 viewWillDisappear() 方法中这样做）

NotificationCenter.default.removeObserver(self, name: .UIKeyboardWillShow, object: nil)
NotificationCenter.default.removeObserver(self, name: .UIKeyboardWillHide, object: nil)
NotificationCenter.default.removeObserver(self, name: .UIKeyboardDidShow, object: nil)
NotificationCenter.default.removeObserver(self, name: .UIKeyboardDidHide, object: nil)

然后，实现您的显示和隐藏方法 - 注意告诉应用忽略交互事件的行 (beginIgnoringInteractionEvents)。这很重要，因为没有它，用户可能会点击字段甚至滚动视图并导致第二次发生转变，从而导致可怕的 UI 故障。在键盘显示和隐藏之前忽略交互事件将防止这种情况发生：

func keyboardWillShow(notification: Notification)
    {
    if let keyboardSize = (notification.userInfo?[UIKeyboardFrameBeginUserInfoKey] as? NSValue)?.cgRectValue
        {
        UIApplication.shared.beginIgnoringInteractionEvents()
        self.view.frame.origin.y -= keyboardSize.height
        // add this line if you are shifting a scrollView, as in a chat application
        self.timelineCollectionView.contentInset.top += keyboardSize.height
        }
    }

func keyboardWillHide(notification: Notification)
    {
    if let keyboardSize = (notification.userInfo?[UIKeyboardFrameBeginUserInfoKey] as? NSValue)?.cgRectValue
        {
        UIApplication.shared.beginIgnoringInteractionEvents()
        self.view.frame.origin.y += keyboardSize.height
        // add this line if you are shifting a scrollView, as in a chat application
        self.timelineCollectionView.contentInset.top -= keyboardSize.height
        }
    }

最后，重新启用用户交互（请记住，此方法在键盘 didShow 或 didHide 之后触发）：

func enableUserInteraction()
    {
    UIApplication.shared.endIgnoringInteractionEvents()
    }

Answer 22

Swift 3 代码

var activeField: UITextField?

override func viewDidLoad() {
    super.viewDidLoad()

    NotificationCenter.default.addObserver(self, selector: #selector(ProfileViewController.keyboardWillShow), name: NSNotification.Name.UIKeyboardWillShow, object: nil)
    NotificationCenter.default.addObserver(self, selector: #selector(ProfileViewController.keyboardWillHide), name: NSNotification.Name.UIKeyboardWillHide, object: nil)
}

func textFieldDidBeginEditing(_ textField: UITextField){
    activeField = textField
}

func textFieldDidEndEditing(_ textField: UITextField){
    activeField = nil
}

func keyboardWillShow(notification: NSNotification) {
    if let keyboardSize = (notification.userInfo?[UIKeyboardFrameBeginUserInfoKey] as? NSValue)?.cgRectValue {
        if (self.activeField?.frame.origin.y)! >= keyboardSize.height {
            self.view.frame.origin.y = keyboardSize.height - (self.activeField?.frame.origin.y)!
        } else {
            self.view.frame.origin.y = 0
        }
    }
}

func keyboardWillHide(notification: NSNotification) {
    self.view.frame.origin.y = 0
}

Answer 23

如果您在同一个 VC 上有 2 个或更多文本字段，并且用户点击其中一个，然后点击另一个，而不调用函数 keyboardWillHide，则视图会再向上一次，这不是必要的，因为您将拥有键盘、具有键盘高度的空白空间，然后是视图，使用我编辑的答案中的代码：

override func viewDidLoad() {       
    super.viewDidLoad()
    NSNotificationCenter.defaultCenter().addObserver(self, selector: Selector("keyboardWillShow:"), name: UIKeyboardWillShowNotification, object: nil)
    NSNotificationCenter.defaultCenter().addObserver(self, selector: Selector("keyboardWillHide:"), name: UIKeyboardWillHideNotification, object: nil)
}

func keyboardWillShow(notification: NSNotification) {
    if let keyboardSize = (notification.userInfo?[UIKeyboardFrameBeginUserInfoKey] as? NSValue)?.CGRectValue() {
        self.view.frame.origin.y -= keyboardSize.height
    }
}

func keyboardWillHide(notification: NSNotification) {
    if let keyboardSize = (notification.userInfo?[UIKeyboardFrameBeginUserInfoKey] as? NSValue)?.CGRectValue() {
        self.view.frame.origin.y += keyboardSize.height
    }
}

要解决这个问题，请将“KeyboardWillShow/Hide”这两个函数替换为：

func keyboardWillShow(notification: NSNotification) {
 if let keyboardSize = (notification.userInfo?[UIKeyboardFrameBeginUserInfoKey] as? NSValue)?.CGRectValue() {
    if view.frame.origin.y == 0{
        self.view.frame.origin.y -= keyboardSize.height
        }
    }
}

func keyboardWillHide(notification: NSNotification) {
    if let keyboardSize = (notification.userInfo?[UIKeyboardFrameBeginUserInfoKey] as? NSValue)?.CGRectValue() {
        if view.frame.origin.y != 0 {
            self.view.frame.origin.y += keyboardSize.height
        }
    }
}

Answer 24

@Boris 的解决方案非常好，但视图有时会损坏。

为了完美对齐，请使用以下代码

override func viewDidLoad() {
super.viewDidLoad()            
NotificationCenter.default.addObserver(self, selector: #selector(ViewController.keyboardWillShow), name: NSNotification.Name.UIKeyboardWillShow, object: nil)
NotificationCenter.default.addObserver(self, selector: #selector(ViewController.keyboardWillHide), name: NSNotification.Name.UIKeyboardWillHide, object: nil)}

功能：

@objc func keyboardWillShow(notification: NSNotification) {        
if let keyboardSize = (notification.userInfo?[UIKeyboardFrameEndUserInfoKey] as? NSValue)?.cgRectValue {
    if self.view.frame.origin.y == 0{
        self.view.frame.origin.y -= keyboardSize.height
    }
}}    

还有，

@objc func keyboardWillHide(notification: NSNotification) {
if let keyboardSize = (notification.userInfo?[UIKeyboardFrameEndUserInfoKey] as? NSValue)?.cgRectValue {
    if self.view.frame.origin.y != 0{
        self.view.frame.origin.y = 0 
    }
} }

Answer 25

这个视频教程是最好的。 7分钟长，它会很有意义。当您有多个文本字段并希望滚动视图在点击该特定文本字段时移动“x”个像素时，这样一个简单的解决方案。

https://youtu.be/VuiPGJOEBH4

只需以下步骤：

- 将所有文本字段放在限制在视图边缘的滚动视图中。

-将所有文本字段和滚动视图作为代表连接到视图控制器。

-使用 IBOutlet 连接所有文本字段和滚动视图。

class ViewController: UIViewController, UITextFieldDelegate {

-将 UITextFieldDelegate 协议添加到您的类中

@IBOutlet var stateAddress: UITextField!
@IBOutlet var zipAddress: UITextField!
@IBOutlet var phoneNumber: UITextField!
@IBOutlet var vetEmailAddress: UITextField!    
@IBOutlet weak var scrollView: UIScrollView!

-将 UITextFieldDelegate 方法添加到您的 swift 文件中：

func textFieldShouldReturn(textField: UITextField) -> Bool {

    textField.resignFirstResponder()
    return true
}


func textFieldDidBeginEditing(textField: UITextField) {

    if (textField == self.stateAddress) {
        scrollView.setContentOffset(CGPointMake(0, 25), animated: true)
    }
    else if (textField == self.zipAddress) {
        scrollView.setContentOffset(CGPointMake(0, 57), animated: true)
    }
    else if (textField == self.phoneNumber) {
        scrollView.setContentOffset(CGPointMake(0, 112), animated: true)
    }
    else if (textField == self.vetEmailAddress) {
        scrollView.setContentOffset(CGPointMake(0, 142), animated: true)
    }
}

func textFieldDidEndEditing(textField: UITextField) {

    scrollView.setContentOffset(CGPointMake(0, 0), animated: true)
}

第一种方法只是激活键盘上的返回按钮以关闭键盘。第二个是当您点击任何特定的文本字段然后设置滚动视图滚动距离的 y 偏移量（我的基于我的视图控制器 25,57,112,142 上的 y 位置）。最后一个说当你离开键盘时，滚动视图会回到原来的位置。

我通过这种方式使我的视图像素完美！

Answer 26

这个功能已经内置在 Ios 中，但是我们需要在外部完成。
插入以下代码
* 当 textField 在键盘下时移动视图，
* textField 在键盘上方时不移动视图
* 需要时根据键盘高度移动视图。
这在所有情况下都有效并经过测试。

import UIKit

class NamVcc: UIViewController, UITextFieldDelegate
{
    @IBOutlet weak var NamTxtBoxVid: UITextField!

    var VydTxtBoxVar: UITextField!
    var ChkKeyPadDspVar: Bool = false
    var KeyPadHytVal: CGFloat!

    override func viewDidLoad()
    {
        super.viewDidLoad()

        NamTxtBoxVid.delegate = self
    }

    override func viewWillAppear(animated: Bool)
    {
        NSNotificationCenter.defaultCenter().addObserver(self,
            selector: #selector(TdoWenKeyPadVyd(_:)),
            name:UIKeyboardWillShowNotification,
            object: nil);
        NSNotificationCenter.defaultCenter().addObserver(self,
            selector: #selector(TdoWenKeyPadHyd(_:)),
            name:UIKeyboardWillHideNotification,
            object: nil);
    }

    func textFieldDidBeginEditing(TxtBoxPsgVar: UITextField)
    {
        self.VydTxtBoxVar = TxtBoxPsgVar
    }

    func textFieldDidEndEditing(TxtBoxPsgVar: UITextField)
    {
        self.VydTxtBoxVar = nil
    }

    func textFieldShouldReturn(TxtBoxPsgVar: UITextField) -> Bool
    {
        self.VydTxtBoxVar.resignFirstResponder()
        return true
    }

    override func touchesBegan(touches: Set<UITouch>, withEvent event: UIEvent?)
    {
        view.endEditing(true)
        super.touchesBegan(touches, withEvent: event)
    }

    func TdoWenKeyPadVyd(NfnPsgVar: NSNotification)
    {
        if(!self.ChkKeyPadDspVar)
        {
            self.KeyPadHytVal = (NfnPsgVar.userInfo?[UIKeyboardFrameBeginUserInfoKey] as? NSValue)?.CGRectValue().height

            var NonKeyPadAraVar: CGRect = self.view.frame
            NonKeyPadAraVar.size.height -= self.KeyPadHytVal

            let VydTxtBoxCenVal: CGPoint? = VydTxtBoxVar?.frame.origin

            if (!CGRectContainsPoint(NonKeyPadAraVar, VydTxtBoxCenVal!))
            {
                self.ChkKeyPadDspVar = true
                UIView.animateWithDuration(1.0,
                    animations:
                    { self.view.frame.origin.y -= (self.KeyPadHytVal)},
                    completion: nil)
            }
            else
            {
                self.ChkKeyPadDspVar = false
            }
        }

    }

    func TdoWenKeyPadHyd(NfnPsgVar: NSNotification)
    {
        if (self.ChkKeyPadDspVar)
        {
            self.ChkKeyPadDspVar = false
            UIView.animateWithDuration(1.0,
                animations:
                { self.view.frame.origin.y += (self.KeyPadHytVal)},
                completion: nil)
        }
    }

    override func viewDidDisappear(animated: Bool)
    {
        super.viewWillDisappear(animated)
        NSNotificationCenter.defaultCenter().removeObserver(self)
        view.endEditing(true)
        ChkKeyPadDspVar = false
    }
}

---

|::|有时视图会下降，在这种情况下使用高度 +/- 150 ：

    NonKeyPadAraVar.size.height -= self.KeyPadHytVal + 150

    { self.view.frame.origin.y -= self.KeyPadHytVal  - 150},
                    completion: nil)

    { self.view.frame.origin.y += self.KeyPadHytVal  - 150},
                completion: nil)

Answer 27

func keyboardWillShow(notification: NSNotification) {

    if let keyboardSize = (notification.userInfo?[UIKeyboardFrameBeginUserInfoKey] as? NSValue)?.CGRectValue() {
        self.view.frame.origin.y = self.view.frame.height - (self.view.frame.height + keyboardSize.height)
    }

}

func keyboardWillHide(notification: NSNotification) {
        self.view.frame.origin.y = 0
}

它必须更稳定

Answer 28

 override func viewWillAppear(animated: Bool)
 {
 super.viewWillAppear(animated)

 NSNotificationCenter.defaultCenter().addObserver(self, selector: "keyboardWillShow:", name: UIKeyboardWillShowNotification, object: nil)
 NSNotificationCenter.defaultCenter().addObserver(self, selector: "keyboardWillHide:", name: UIKeyboardWillHideNotification, object: nil)

 }

 // MARK: - keyboard
 func keyboardWillShow(notification: NSNotification) 
{

if let userInfo = notification.userInfo {
if let keyboardSize = (userInfo[UIKeyboardFrameBeginUserInfoKey] as? NSValue)?.CGRectValue() {
let contentInsets = self.tblView.contentInset as UIEdgeInsets
self.tblView.contentInset = UIEdgeInsets(top: contentInsets.top, left: contentInsets.left, bottom: keyboardSize.height, right:contentInsets.right)
                    // ...
                } else {
                    // no UIKeyboardFrameBeginUserInfoKey entry in userInfo
                }
            } else {
                // no userInfo dictionary in notification
            }
        }

func keyboardWillHide(notification: NSNotification) 
{
let contentInsets = self.tblView.contentInset as UIEdgeInsets
self.tblView.contentInset = UIEdgeInsets(top: contentInsets.top, left: contentInsets.left, bottom: 0, right:contentInsets.right)
 }

Answer 29

使用以下代码在 UITextField Clicked 上查看 Up

func textFieldDidBeginEditing(textField: UITextField) {
    ViewUpanimateMoving(true, upValue: 100)
}
func textFieldDidEndEditing(textField: UITextField) {
    ViewUpanimateMoving(false, upValue: 100)
}
func ViewUpanimateMoving (up:Bool, upValue :CGFloat){
    var durationMovement:NSTimeInterval = 0.3
    var movement:CGFloat = ( up ? -upValue : upValue)
    UIView.beginAnimations( "animateView", context: nil)
    UIView.setAnimationBeginsFromCurrentState(true)
    UIView.setAnimationDuration(durationMovement)
    self.view.frame = CGRectOffset(self.view.frame, 0,  movement)
    UIView.commitAnimations()
}

Answer 30

我做了一个cocoapod来简化事情：

https://github.com/xtrinch/KeyboardLayoutHelper

使用方法：

创建一个自动布局底部约束，在模块 KeyboardLayoutHelper 中给它一个 KeyboardLayoutConstraint 类，Pod 会做必要的工作来增加它以适应出现和消失的键盘。有关如何使用它的示例，请参见示例项目（我制作了两个：scrollView 中的 textFields，以及带有两个基本视图的垂直居中的 textFields - 登录和注册）。

底部布局约束可以是容器视图，textField 本身，任何东西，你可以命名它。