ios 当键盘出现快速时移动文本字段

Move textfield when keyboard appears swift

提问by Pedro Manfredi

I'm using Swift for programing with iOS and I'm using this code to move the UITextField, but it does not work. I call the function keyboardWillShowcorrectly, but the textfield doesn't move. I'm using autolayout.

我正在使用 Swift 进行 iOS 编程，我正在使用此代码移动UITextField，但它不起作用。我keyboardWillShow正确调用了该函数，但文本字段没有移动。我正在使用自动布局。

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);
}

deinit {
    NSNotificationCenter.defaultCenter().removeObserver(self);
}

func keyboardWillShow(notification: NSNotification) {
    if let keyboardSize = (notification.userInfo?[UIKeyboardFrameBeginUserInfoKey] as? NSValue)?.CGRectValue() {
        //let contentInsets = UIEdgeInsets(top: 0, left: 0, bottom: keyboardSize.height, right: 0)

        var frame = self.ChatField.frame
        frame.origin.y = frame.origin.y - keyboardSize.height + 167
        self.chatField.frame = frame
        println("asdasd")
    }
}

回答by Joseph Lord

There are a couple of improvements to be made on the existing answers.

对现有答案有一些改进。

Firstly the UIKeyboardWillChangeFrameNotification is probably the best notification as it handles changes that aren't just show/hide but changes due to keyboard changes (language, using 3rd party keyboards etc.) and rotations too (but note comment below indicating the keyboard will hide should also be handled to support hardware keyboard connection).

首先，UIKeyboardWillChangeFrameNotification 可能是最好的通知，因为它处理的更改不仅是显示/隐藏，而且是由于键盘更改（语言、使用第 3 方键盘等）和旋转而引起的更改（但请注意下面的注释表明键盘将隐藏应该也可以处理以支持硬件键盘连接）。

Secondly the animation parameters can be pulled from the notification to ensure that animations are properly together.

其次，可以从通知中提取动画参数，以确保动画正确组合在一起。

There are probably options to clean up this code a bit more especially if you are comfortable with force unwrapping the dictionary code.

可能有一些选项可以更清理此代码，特别是如果您对强制展开字典代码感到满意。

Swift 3

斯威夫特 3

class MyViewController: UIViewController {

// This constraint ties an element at zero points from the bottom layout guide
@IBOutlet var keyboardHeightLayoutConstraint: NSLayoutConstraint?

override func viewDidLoad() {
    super.viewDidLoad()
    // Note that SO highlighting makes the new selector syntax (#selector()) look
    // like a comment but it isn't one
    NotificationCenter.default.addObserver(self,
        selector: #selector(self.keyboardNotification(notification:)),
        name: NSNotification.Name.UIKeyboardWillChangeFrame,
        object: nil)
}

deinit {
    NotificationCenter.default.removeObserver(self)
}

@objc func keyboardNotification(notification: NSNotification) {
    if let userInfo = notification.userInfo {
        let endFrame = (userInfo[UIKeyboardFrameEndUserInfoKey] as? NSValue)?.cgRectValue
        let endFrameY = endFrame.origin.y ?? 0
        let duration:TimeInterval = (userInfo[UIKeyboardAnimationDurationUserInfoKey] as? NSNumber)?.doubleValue ?? 0
        let animationCurveRawNSN = userInfo[UIKeyboardAnimationCurveUserInfoKey] as? NSNumber
        let animationCurveRaw = animationCurveRawNSN?.uintValue ?? UIViewAnimationOptions.curveEaseInOut.rawValue
        let animationCurve:UIViewAnimationOptions = UIViewAnimationOptions(rawValue: animationCurveRaw)
        if endFrameY >= UIScreen.main.bounds.size.height {
            self.keyboardHeightLayoutConstraint?.constant = 0.0
        } else {
            self.keyboardHeightLayoutConstraint?.constant = endFrame?.size.height ?? 0.0
        }
        UIView.animate(withDuration: duration,
                                   delay: TimeInterval(0),
                                   options: animationCurve,
                                   animations: { self.view.layoutIfNeeded() },
                                   completion: nil)
    }
}

(Edited to account for keyboard animating offscreen instead of shrinking, as per @Gabox's awesome comment below)

（根据下面@Gabox 的精彩评论，编辑以考虑键盘动画屏幕外动画而不是缩小）

Swift 5

斯威夫特 5

class MyViewController: UIViewController {

// This constraint ties an element at zero points from the bottom layout guide
@IBOutlet var keyboardHeightLayoutConstraint: NSLayoutConstraint?

override func viewDidLoad() {
    super.viewDidLoad()
    // Note that SO highlighting makes the new selector syntax (#selector()) look
    // like a comment but it isn't one
    NotificationCenter.default.addObserver(self,
        selector: #selector(self.keyboardNotification(notification:)),
        name: UIResponder.keyboardWillChangeFrameNotification,
        object: nil)
}

deinit {
    NotificationCenter.default.removeObserver(self)
}

@objc func keyboardNotification(notification: NSNotification) {
    if let userInfo = notification.userInfo {
        let endFrame = (userInfo[UIResponder.keyboardFrameEndUserInfoKey] as? NSValue)?.cgRectValue
        let endFrameY = endFrame?.origin.y ?? 0
        let duration:TimeInterval = (userInfo[UIResponder.keyboardAnimationDurationUserInfoKey] as? NSNumber)?.doubleValue ?? 0
        let animationCurveRawNSN = userInfo[UIResponder.keyboardAnimationCurveUserInfoKey] as? NSNumber
        let animationCurveRaw = animationCurveRawNSN?.uintValue ?? UIView.AnimationOptions.curveEaseInOut.rawValue
        let animationCurve:UIView.AnimationOptions = UIView.AnimationOptions(rawValue: animationCurveRaw)
        if endFrameY >= UIScreen.main.bounds.size.height {
            self.keyboardHeightLayoutConstraint?.constant = 0.0
        } else {
            self.keyboardHeightLayoutConstraint?.constant = endFrame?.size.height ?? 0.0
        }
        UIView.animate(withDuration: duration,
                                   delay: TimeInterval(0),
                                   options: animationCurve,
                                   animations: { self.view.layoutIfNeeded() },
                                   completion: nil)
    }
}

回答by Isuru

If you're using Auto Layout, I assume you've set the Bottom Space to Superviewconstraint. If that's the case, you simply have to update the constraint's value. Here's how you do it with a little bit of animation.

如果您使用自动布局，我假设您已将底部空间设置为 Superview约束。如果是这种情况，您只需更新约束的值。这是你如何通过一点动画来做到这一点。

func keyboardWasShown(notification: NSNotification) {
    let info = notification.userInfo!
    let keyboardFrame: CGRect = (info[UIKeyboardFrameEndUserInfoKey] as! NSValue).CGRectValue()

    UIView.animateWithDuration(0.1, animations: { () -> Void in
        self.bottomConstraint.constant = keyboardFrame.size.height + 20
    })
}

The hardcoded 20 is added only to pop the textfield above the keyboard just a bit. Otherwise the keyboard's top margin and textfield's bottom margin would be touching.

添加硬编码 20 只是为了将键盘上方的文本字段弹出一点。否则键盘的上边距和文本字段的下边距会相互影响。

When the keyboard is dismissed, reset the constraint's value to its original one.

当键盘关闭时，将约束的值重置为其原始值。

回答by Saqib Omer

A simple solution is to move view up with constant of keyboard height.

一个简单的解决方案是在键盘高度不变的情况下向上移动视图。

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);
}

@objc func keyboardWillShow(sender: NSNotification) {
     self.view.frame.origin.y = -150 // Move view 150 points upward 
}

@objc func keyboardWillHide(sender: NSNotification) {
     self.view.frame.origin.y = 0 // Move view to original position  
}

Swift 5:

斯威夫特 5：

NotificationCenter.default.addObserver(self, selector: #selector(keyboardWillShow(sender:)), name: UIResponder.keyboardWillShowNotification, object: nil);

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

回答by Jogendra.Com

For moving your view while editing textfield try this , I have applied this ,

为了在编辑文本字段时移动您的视图试试这个，我已经应用了这个，

Option 1 :- ** **Update in Swift 5.0 and iPhone X , XR , XS and XS MaxMove using NotificationCenter

选项 1：- ** **使用 NotificationCenter在 Swift 5.0 和 iPhone X、XR、XS 和 XS MaxMove 中更新

• Register this Notification in func viewWillAppear(_ animated: Bool)

• Deregister this Notification in func viewWillDisappear(_ animated: Bool)

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

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

Note:- If you will not deregister than it will call from child class and will reason of crashing or else.

注意：- 如果您不注销，它会从子类调用，并且会导致崩溃或其他原因。

override func viewWillAppear(_ animated: Bool) {
    super.viewWillAppear(animated)
    NotificationCenter.default.addObserver( self, selector: #selector(keyboardWillShow(notification:)), name:  UIResponder.keyboardWillShowNotification, object: nil )
}
override func viewWillDisappear(_ animated: Bool) {
    super.viewWillDisappear(animated)
    NotificationCenter.default.removeObserver(self, name: UIResponder.keyboardWillShowNotification, object: nil)
}

@objc func keyboardWillShow( notification: Notification) {
    if let keyboardFrame: NSValue = notification.userInfo?[UIResponder.keyboardFrameEndUserInfoKey] as? NSValue {
        var newHeight: CGFloat
        let duration:TimeInterval = (notification.userInfo![UIResponder.keyboardAnimationDurationUserInfoKey] as? NSNumber)?.doubleValue ?? 0
        let animationCurveRawNSN = notification.userInfo![UIResponder.keyboardAnimationCurveUserInfoKey] as? NSNumber
        let animationCurveRaw = animationCurveRawNSN?.uintValue ?? UIView.AnimationOptions.curveEaseInOut.rawValue
        let animationCurve:UIView.AnimationOptions = UIView.AnimationOptions(rawValue: animationCurveRaw)
        if #available(iOS 11.0, *) {
            newHeight = keyboardFrame.cgRectValue.height - self.view.safeAreaInsets.bottom
        } else {
            newHeight = keyboardFrame.cgRectValue.height
        }
        let keyboardHeight = newHeight  + 10 // **10 is bottom margin of View**  and **this newHeight will be keyboard height**
        UIView.animate(withDuration: duration,
                       delay: TimeInterval(0),
                       options: animationCurve,
                       animations: {
                        self.view.textViewBottomConstraint.constant = keyboardHeight **//Here you can manage your view constraints for animated show**
                        self.view.layoutIfNeeded() },
                       completion: nil)
    }
}

Option 2 :-Its work fine

选项 2 :-工作正常

func textFieldDidBeginEditing(textField: UITextField) {
        self.animateViewMoving(up: true, moveValue: 100)
}
func textFieldDidEndEditing(textField: UITextField) {
        self.animateViewMoving(up: false, moveValue: 100)
}

func animateViewMoving (up:Bool, moveValue :CGFloat){
    var movementDuration:NSTimeInterval = 0.3
    var 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()
}

I got this answer from this source UITextField move up when keyboard appears in Swift

当键盘出现在 Swift 中时，我从这个源UITextField move up得到了这个答案

IN the Swift 4 ---

在斯威夫特 4 ---

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

    func textFieldDidEndEditing(_ textField: UITextField) {
        animateViewMoving(up: false, moveValue: 100)
    }
    func animateViewMoving (up:Bool, moveValue :CGFloat){
        let movementDuration:TimeInterval = 0.3
        let movement:CGFloat = ( up ? -moveValue : moveValue)
        UIView.beginAnimations( "animateView", context: nil)
        UIView.setAnimationBeginsFromCurrentState(true)
        UIView.setAnimationDuration(movementDuration ) 
        self.view.frame = self.view.frame.offsetBy(dx: 0, dy: movement)
        UIView.commitAnimations()
    }

回答by scootermg

I love clean Swift code. So here's the tightest code I could come up with to move a text view up/down with the keyboard. It's currently working in an iOS8/9 Swift 2 production app.

我喜欢干净的 Swift 代码。所以这是我能想出的最紧凑的代码，可以用键盘向上/向下移动文本视图。它目前正在 iOS8/9 Swift 2 生产应用程序中工作。

UPDATE (March 2016): I just tightened up my previous code as much as possible. Also, there are a bunch of popular answers here that hardcode the keyboard height and animation parameters. There's no need for that, not to mention that the numbers in these answers don't always line up with the actual values I'm seeing on my 6s+ iOS9 (keyboard height of 226, duration of 0.25, and animation curve of 7). In any case, it's almost no extra code to get those values straight from the system. See below.

更新（2016 年 3 月）：我只是尽可能地收紧了我以前的代码。此外，这里有很多流行的答案，它们对键盘高度和动画参数进行了硬编码。没有必要，更不用说这些答案中的数字并不总是与我在 6s+ iOS9 上看到的实际值一致（键盘高度为 226，持续时间为 0.25，动画曲线为 7）。无论如何，直接从系统中获取这些值几乎不需要额外的代码。见下文。

override func viewDidLoad() {
    super.viewDidLoad()

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

func animateWithKeyboard(notification: NSNotification) {

    // Based on both Apple's docs and personal experience, 
    // I assume userInfo and its documented keys are available.
    // If you'd like, you can remove the forced unwrapping and add your own default values.

    let userInfo = notification.userInfo!
    let keyboardHeight = (userInfo[UIKeyboardFrameEndUserInfoKey] as! NSValue).CGRectValue().height
    let duration = userInfo[UIKeyboardAnimationDurationUserInfoKey] as! Double
    let curve = userInfo[UIKeyboardAnimationCurveUserInfoKey] as! UInt
    let moveUp = (notification.name == UIKeyboardWillShowNotification)

    // baseContraint is your Auto Layout constraint that pins the
    // text view to the bottom of the superview.

    baseConstraint.constant = moveUp ? -keyboardHeight : 0

    let options = UIViewAnimationOptions(rawValue: curve << 16)
    UIView.animateWithDuration(duration, delay: 0, options: options,
        animations: {
            self.view.layoutIfNeeded()
        },
        completion: nil
    )

}

NOTE: This code covers the most comment/general case. However, more code may be needed to handle different orientations and/or custom keyboards Here's an in-depth articleon working with the iOS keyboard. If you need to handle every scenario, this may help.

注意：此代码涵盖了大多数注释/一般情况。但是，可能需要更多代码来处理不同的方向和/或自定义键盘这里有一篇关于使用 iOS 键盘的深入文章。如果您需要处理每种情况，这可能会有所帮助。

回答by Hlung

Edit: I recommend an easier and cleaner solution. Just change the class of bottom spacing constraint to KeyboardLayoutConstraint. It will automatically expand to the keyboard height.

编辑：我推荐一个更简单、更清洁的解决方案。只需将底部间距约束的类更改为KeyboardLayoutConstraint。它会自动扩展到键盘高度。

---

---

This is an improved version of @JosephLord 's answer.

这是@JosephLord 答案的改进版本。

As tested on iOS 8.3 iPad Simulator, Portrait. Xcode6.3 beta4, I found his answer doesn't work when keyboard is hiding because UIKeyboardFrameEndUserInfoKeyis "NSRect: {{0, 1024}, {768, 264}}";. The height is never 0.

在 iOS 8.3 iPad 模拟器上测试，Portrait。Xcode6.3 beta4，我发现他的答案在键盘隐藏时不起作用，因为UIKeyboardFrameEndUserInfoKey是"NSRect: {{0, 1024}, {768, 264}}";. 高度从来没有0。

This goes back to use the traditional UIKeyboardWillShowNotificationand UIKeyboardWillHideNotificationto better tell when keyboard is hiding rather than relying on the end frame's height. UIKeyboardWillShowNotificationis also sent when keyboard frame is changed so it should cover all use cases.

这可以追溯到使用传统UIKeyboardWillShowNotification并UIKeyboardWillHideNotification更好地判断键盘何时隐藏而不是依赖于端框架的高度。UIKeyboardWillShowNotification更改键盘框架时也会发送，因此它应该涵盖所有用例。

    // You have to set this up in storyboard first!. 
    // It's a vertical spacing constraint between view and bottom of superview.
    @IBOutlet weak var bottomSpacingConstraint: NSLayoutConstraint! 

    override func viewDidLoad() {
        super.viewDidLoad()

        NSNotificationCenter.defaultCenter().addObserver(self, selector: Selector("keyboardNotification:"), name:UIKeyboardWillShowNotification, object: nil);
        NSNotificationCenter.defaultCenter().addObserver(self, selector: Selector("keyboardNotification:"), name:UIKeyboardWillHideNotification, object: nil);
    }

    deinit {
        NSNotificationCenter.defaultCenter().removeObserver(self)
    }

    func keyboardNotification(notification: NSNotification) {

        let isShowing = notification.name == UIKeyboardWillShowNotification

        if let userInfo = notification.userInfo {
            let endFrame = (userInfo[UIKeyboardFrameEndUserInfoKey] as? NSValue)?.CGRectValue()
            let endFrameHeight = endFrame?.size.height ?? 0.0
            let duration:NSTimeInterval = (userInfo[UIKeyboardAnimationDurationUserInfoKey] as? NSNumber)?.doubleValue ?? 0
            let animationCurveRawNSN = userInfo[UIKeyboardAnimationCurveUserInfoKey] as? NSNumber
            let animationCurveRaw = animationCurveRawNSN?.unsignedLongValue ?? UIViewAnimationOptions.CurveEaseInOut.rawValue
            let animationCurve:UIViewAnimationOptions = UIViewAnimationOptions(rawValue: animationCurveRaw)
            self.bottomSpacingConstraint?.constant = isShowing ? endFrameHeight : 0.0
            UIView.animateWithDuration(duration,
                delay: NSTimeInterval(0),
                options: animationCurve,
                animations: { self.view.layoutIfNeeded() },
                completion: nil)
        }
    }

回答by pansora abhay

i am working with swift 4and i am solved this issue without use any extra bottom constraint look my code is here.its really working on my case

我正在使用swift 4，我在没有使用任何额外底部约束的情况下解决了这个问题，看起来我的代码在这里。它真的适用于我的案例

1) Add Notification Observer in did load

1) 在 did load 中添加 Notification Observer

override func viewDidLoad() {
        super.viewDidLoad()
        setupManager()
        // Do any additional setup after loading the view.
        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)
    }

override func viewDidLoad() {
        super.viewDidLoad()
        setupManager()
        // Do any additional setup after loading the view.
        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)
    }

2) Remove Notification Observer like

2）删除通知观察者，如

deinit {
        NotificationCenter.default.removeObserver(self)
    }

deinit {
        NotificationCenter.default.removeObserver(self)
    }

3) Add keyboard show/ hide methods like

3）添加键盘显示/隐藏方法，如

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

@objc func keyboardWillHide(notification: NSNotification) {
        if let keyboardSize = (notification.userInfo?[UIKeyboardFrameBeginUserInfoKey] as? NSValue)?.cgRectValue {
            UIView.animate(withDuration: 0.1, animations: { () -> Void in
                self.view.frame.origin.y += keyboardSize.height
                self.view.layoutIfNeeded()
            })
        }
    }

4) Add textfeild delegate and add touchesBegan methods .usefull for hide the keyboard when touch outside the textfeild on screen

4) 添加 textfeild 委托并添加 touchesBegan 方法 .usefull 用于在屏幕上的 textfeild 之外触摸时隐藏键盘

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

    }

回答by Jeff Gu Kang

This is an improved version of @JosephLord and @Hlung's answer. It can apply whether you have tabbar or not. And it would perfectly restore view that is moved by keyboard to original position.

这是@JosephLord 和@Hlung 答案的改进版本。无论您是否有标签栏，它都可以应用。并且可以完美还原键盘移动到原始位置的视图。

// You have to set this up in storyboard first!. 
// It's a vertical spacing constraint between view and bottom of superview.
@IBOutlet weak var bottomSpacingConstraint: NSLayoutConstraint! 

override func viewDidLoad() {
        super.viewDidLoad()            

        //    Receive(Get) Notification
        NSNotificationCenter.defaultCenter().addObserver(self, selector: "keyboardNotification:", name: UIKeyboardWillShowNotification, object: nil)
        NSNotificationCenter.defaultCenter().addObserver(self, selector: "keyboardNotification:", name: UIKeyboardWillHideNotification, object: nil)


        self.originalConstraint = self.keyboardHeightLayoutConstraint?.constant //for original coordinate.
}

func keyboardNotification(notification: NSNotification) {
        let isShowing = notification.name == UIKeyboardWillShowNotification

        var tabbarHeight: CGFloat = 0
        if self.tabBarController? != nil {
            tabbarHeight = self.tabBarController!.tabBar.frame.height
        }
        if let userInfo = notification.userInfo {
            let endFrame = (userInfo[UIKeyboardFrameEndUserInfoKey] as? NSValue)?.CGRectValue()
            let duration:NSTimeInterval = (userInfo[UIKeyboardAnimationDurationUserInfoKey] as? NSNumber)?.doubleValue ?? 0
            let animationCurveRawNSN = userInfo[UIKeyboardAnimationCurveUserInfoKey] as? NSNumber
            let animationCurveRaw = animationCurveRawNSN?.unsignedLongValue ?? UIViewAnimationOptions.CurveEaseInOut.rawValue
            let animationCurve:UIViewAnimationOptions = UIViewAnimationOptions(rawValue: animationCurveRaw)
            self.keyboardHeightLayoutConstraint?.constant = isShowing ? (endFrame!.size.height - tabbarHeight) : self.originalConstraint!
            UIView.animateWithDuration(duration,
                delay: NSTimeInterval(0),
                options: animationCurve,
                animations: { self.view.layoutIfNeeded() },
                completion: nil)
        }
}

回答by gammachill

Easiest way that doesn't require any code:

不需要任何代码的最简单方法：

1. Download KeyboardLayoutConstraint.swiftand add (drag & drop) the file into your project, if you're not using the Spring animation framework already.
2. In your storyboard, create a bottom constraint for the object/view/textfield, select the constraint (double-click it) and in the Identity Inspector, change its class from NSLayoutConstraint to KeyboardLayoutConstraint.
3. Done!

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. 在您的故事板中，为对象/视图/文本字段创建一个底部约束，选择该约束（双击它）并在 Identity Inspector 中，将其类从 NSLayoutConstraint 更改为 KeyboardLayoutConstraint。
3. 完毕！

The object will auto-move up with the keyboard, in sync.

该对象将与键盘同步自动向上移动。

回答by ale_stro

Such simple UIViewControllerextensioncan be used

可以使用这样简单的UIViewController扩展

//MARK: - Observers
extension UIViewController {

    func addObserverForNotification(notificationName: String, actionBlock: (NSNotification) -> Void) {
        NSNotificationCenter.defaultCenter().addObserverForName(notificationName, object: nil, queue: NSOperationQueue.mainQueue(), usingBlock: actionBlock)
    }

    func removeObserver(observer: AnyObject, notificationName: String) {
        NSNotificationCenter.defaultCenter().removeObserver(observer, name: notificationName, object: nil)
    }
}

//MARK: - Keyboard observers
extension UIViewController {

    typealias KeyboardHeightClosure = (CGFloat) -> ()

    func addKeyboardChangeFrameObserver(willShow willShowClosure: KeyboardHeightClosure?,
        willHide willHideClosure: KeyboardHeightClosure?) {
            NSNotificationCenter.defaultCenter().addObserverForName(UIKeyboardWillChangeFrameNotification,
                object: nil, queue: NSOperationQueue.mainQueue(), usingBlock: { [weak self](notification) in
                    if let userInfo = notification.userInfo,
                        let frame = (userInfo[UIKeyboardFrameEndUserInfoKey] as? NSValue)?.CGRectValue(),
                        let duration = userInfo[UIKeyboardAnimationDurationUserInfoKey] as? Double,
                        let c = userInfo[UIKeyboardAnimationCurveUserInfoKey] as? UInt,
                        let kFrame = self?.view.convertRect(frame, fromView: nil),
                        let kBounds = self?.view.bounds {

                            let animationType = UIViewAnimationOptions(rawValue: c)
                            let kHeight = kFrame.size.height
                            UIView.animateWithDuration(duration, delay: 0, options: animationType, animations: {
                                if CGRectIntersectsRect(kBounds, kFrame) { // keyboard will be shown
                                    willShowClosure?(kHeight)
                                } else { // keyboard will be hidden
                                    willHideClosure?(kHeight)
                                }
                                }, completion: nil)
                    } else {
                            print("Invalid conditions for UIKeyboardWillChangeFrameNotification")
                    }
            })
    }

    func removeKeyboardObserver() {
        removeObserver(self, notificationName: UIKeyboardWillChangeFrameNotification)
    }
}

Example of usage

使用示例

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

        removeKeyboardObserver()
    }

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

    addKeyboardChangeFrameObserver(willShow: { [weak self](height) in
        //Update constraints here
        self?.view.setNeedsUpdateConstraints()
        }, willHide: { [weak self](height) in
        //Reset constraints here
        self?.view.setNeedsUpdateConstraints()
    })
}

Swift 4 solution

斯威夫特 4 解决方案

//MARK: - Observers
extension UIViewController {

  func addObserverForNotification(_ notificationName: Notification.Name, actionBlock: @escaping (Notification) -> Void) {
    NotificationCenter.default.addObserver(forName: notificationName, object: nil, queue: OperationQueue.main, using: actionBlock)
  }

  func removeObserver(_ observer: AnyObject, notificationName: Notification.Name) {
    NotificationCenter.default.removeObserver(observer, name: notificationName, object: nil)
  }
}

//MARK: - Keyboard handling
extension UIViewController {

  typealias KeyboardHeightClosure = (CGFloat) -> ()

  func addKeyboardChangeFrameObserver(willShow willShowClosure: KeyboardHeightClosure?,
                                      willHide willHideClosure: KeyboardHeightClosure?) {
    NotificationCenter.default.addObserver(forName: NSNotification.Name.UIKeyboardWillChangeFrame,
                                           object: nil, queue: OperationQueue.main, using: { [weak self](notification) in
                                            if let userInfo = notification.userInfo,
                                              let frame = (userInfo[UIKeyboardFrameEndUserInfoKey] as? NSValue)?.cgRectValue,
                                              let duration = userInfo[UIKeyboardAnimationDurationUserInfoKey] as? Double,
                                              let c = userInfo[UIKeyboardAnimationCurveUserInfoKey] as? UInt,
                                              let kFrame = self?.view.convert(frame, from: nil),
                                              let kBounds = self?.view.bounds {

                                              let animationType = UIViewAnimationOptions(rawValue: c)
                                              let kHeight = kFrame.size.height
                                              UIView.animate(withDuration: duration, delay: 0, options: animationType, animations: {
                                                if kBounds.intersects(kFrame) { // keyboard will be shown
                                                  willShowClosure?(kHeight)
                                                } else { // keyboard will be hidden
                                                  willHideClosure?(kHeight)
                                                }
                                              }, completion: nil)
                                            } else {
                                              print("Invalid conditions for UIKeyboardWillChangeFrameNotification")
                                            }
    })
  }

  func removeKeyboardObserver() {
    removeObserver(self, notificationName: NSNotification.Name.UIKeyboardWillChangeFrame)
  }
}

Swift 4.2

斯威夫特 4.2

//MARK: - Keyboard handling
extension UIViewController {

    func addObserverForNotification(_ notificationName: Notification.Name, actionBlock: @escaping (Notification) -> Void) {
        NotificationCenter.default.addObserver(forName: notificationName, object: nil, queue: OperationQueue.main, using: actionBlock)
    }

    func removeObserver(_ observer: AnyObject, notificationName: Notification.Name) {
        NotificationCenter.default.removeObserver(observer, name: notificationName, object: nil)
    }

    typealias KeyboardHeightClosure = (CGFloat) -> ()

    func removeKeyboardObserver() {
        removeObserver(self, notificationName: UIResponder.keyboardWillChangeFrameNotification)
    }

    func addKeyboardChangeFrameObserver(willShow willShowClosure: KeyboardHeightClosure?,
                                        willHide willHideClosure: KeyboardHeightClosure?) {
        NotificationCenter.default.addObserver(forName: UIResponder.keyboardWillChangeFrameNotification,
                                               object: nil, queue: OperationQueue.main, using: { [weak self](notification) in
                                                if let userInfo = notification.userInfo,
                                                    let frame = (userInfo[UIResponder.keyboardFrameEndUserInfoKey] as? NSValue)?.cgRectValue,
                                                    let duration = userInfo[UIResponder.keyboardAnimationDurationUserInfoKey] as? Double,
                                                    let c = userInfo[UIResponder.keyboardAnimationCurveUserInfoKey] as? UInt,
                                                    let kFrame = self?.view.convert(frame, from: nil),
                                                    let kBounds = self?.view.bounds {

                                                    let animationType = UIView.AnimationOptions(rawValue: c)
                                                    let kHeight = kFrame.size.height
                                                    UIView.animate(withDuration: duration, delay: 0, options: animationType, animations: {
                                                        if kBounds.intersects(kFrame) { // keyboard will be shown
                                                            willShowClosure?(kHeight)
                                                        } else { // keyboard will be hidden
                                                            willHideClosure?(kHeight)
                                                        }
                                                    }, completion: nil)
                                                } else {
                                                    print("Invalid conditions for UIKeyboardWillChangeFrameNotification")
                                                }
        })
    }
}