仅在键盘覆盖输入字段时才向上移动视图

时间：2015-03-02 15:23:52

标签： ios swift keyboard xcode6

我正在尝试为iPhone构建输入屏幕。屏幕有许多输入字段。其中大多数位于屏幕顶部，但两个字段位于底部。 当用户尝试编辑屏幕底部的文本时，键盘将弹出并覆盖屏幕。 当发生这种情况时，我找到了一个简单的解决方案来移动屏幕，但结果是屏幕始终向上移动，当用户尝试编辑这些屏幕时，屏幕顶部的字段无法触及。

在编辑底部字段时，有没有办法让屏幕仅移动？

我使用了此代码here：

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

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

27 个答案:

答案 0 :(得分：197)

this document by Apple详细解释了您的问题。此页面上的示例代码（位于Listing 4-1）完全符合您的需要，只有在当前编辑应位于键盘下方时才会滚动视图。您只需要将所需的控件放在scrollViiew中。 唯一的问题是这是Objective-C，我认为你需要它在Swift中...所以它是：

声明变量

var activeField: UITextField?

然后添加这些方法

 func registerForKeyboardNotifications()
{
    //Adding notifies on keyboard appearing
    NSNotificationCenter.defaultCenter().addObserver(self, selector: "keyboardWasShown:", name: UIKeyboardWillShowNotification, object: nil)
    NSNotificationCenter.defaultCenter().addObserver(self, selector: "keyboardWillBeHidden:", name: UIKeyboardWillHideNotification, object: nil)
}


func deregisterFromKeyboardNotifications()
{
    //Removing notifies on keyboard appearing
    NSNotificationCenter.defaultCenter().removeObserver(self, name: UIKeyboardWillShowNotification, object: nil)
    NSNotificationCenter.defaultCenter().removeObserver(self, name: UIKeyboardWillHideNotification, object: nil)
}

func keyboardWasShown(notification: NSNotification)
{
    //Need to calculate keyboard exact size due to Apple suggestions
    self.scrollView.scrollEnabled = true
    var info : NSDictionary = notification.userInfo!
    var keyboardSize = (info[UIKeyboardFrameBeginUserInfoKey] as? NSValue)?.CGRectValue().size
    var contentInsets : UIEdgeInsets = UIEdgeInsetsMake(0.0, 0.0, keyboardSize!.height, 0.0)

    self.scrollView.contentInset = contentInsets
    self.scrollView.scrollIndicatorInsets = contentInsets

    var aRect : CGRect = self.view.frame
    aRect.size.height -= keyboardSize!.height
    if let activeFieldPresent = activeField
    {
        if (!CGRectContainsPoint(aRect, activeField!.frame.origin))
        {
            self.scrollView.scrollRectToVisible(activeField!.frame, animated: true)
        }
    }


}


func keyboardWillBeHidden(notification: NSNotification)
{
    //Once keyboard disappears, restore original positions
    var info : NSDictionary = notification.userInfo!
    var keyboardSize = (info[UIKeyboardFrameBeginUserInfoKey] as? NSValue)?.CGRectValue().size
    var contentInsets : UIEdgeInsets = UIEdgeInsetsMake(0.0, 0.0, -keyboardSize!.height, 0.0)
    self.scrollView.contentInset = contentInsets
    self.scrollView.scrollIndicatorInsets = contentInsets
    self.view.endEditing(true)
    self.scrollView.scrollEnabled = false

}

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

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

确保将ViewController声明为UITextFieldDelegate并在初始化方法中设置正确的委托： 例如：

self.you_text_field.delegate = self

请记得在退出时在viewInit和registerForKeyboardNotifications上调用deregisterFromKeyboardNotifications。

编辑/更新：Swift 4.2语法

func registerForKeyboardNotifications(){
    //Adding notifies on keyboard appearing
    NotificationCenter.default.addObserver(self, selector: #selector(keyboardWasShown(notification:)), name: NSNotification.Name.UIResponder.keyboardWillShowNotification, object: nil)
    NotificationCenter.default.addObserver(self, selector: #selector(keyboardWillBeHidden(notification:)), name: NSNotification.Name.UIResponder.keyboardWillHideNotification, object: nil)
}

func deregisterFromKeyboardNotifications(){
    //Removing notifies on keyboard appearing
    NotificationCenter.default.removeObserver(self, name: NSNotification.Name.UIResponder.keyboardWillShowNotification, object: nil)
    NotificationCenter.default.removeObserver(self, name: NSNotification.Name.UIResponder.keyboardWillHideNotification, object: nil)
}

@objc func keyboardWasShown(notification: NSNotification){
    //Need to calculate keyboard exact size due to Apple suggestions
    self.scrollView.isScrollEnabled = true
    var info = notification.userInfo!
    let keyboardSize = (info[UIResponder.keyboardFrameBeginUserInfoKey] as? NSValue)?.cgRectValue.size
    let contentInsets : UIEdgeInsets = UIEdgeInsets(top: 0.0, left: 0.0, bottom: keyboardSize!.height, right: 0.0)

    self.scrollView.contentInset = contentInsets
    self.scrollView.scrollIndicatorInsets = contentInsets

    var aRect : CGRect = self.view.frame
    aRect.size.height -= keyboardSize!.height
    if let activeField = self.activeField {
        if (!aRect.contains(activeField.frame.origin)){
            self.scrollView.scrollRectToVisible(activeField.frame, animated: true)
        }
    }
}

@objc func keyboardWillBeHidden(notification: NSNotification){
    //Once keyboard disappears, restore original positions
    var info = notification.userInfo!
    let keyboardSize = (info[UIResponder.keyboardFrameBeginUserInfoKey] as? NSValue)?.cgRectValue.size
    let contentInsets : UIEdgeInsets = UIEdgeInsets(top: 0.0, left: 0.0, bottom: -keyboardSize!.height, right: 0.0)
    self.scrollView.contentInset = contentInsets
    self.scrollView.scrollIndicatorInsets = contentInsets
    self.view.endEditing(true)
    self.scrollView.isScrollEnabled = false
}

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

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

答案 1 :(得分：122)

这是我的2美分：

您是否尝试过：https://github.com/hackiftekhar/IQKeyboardManager

非常容易安装Swift或Objective-C。

这是如何运作的：

IQKeyboardManager（Swift）： - IQKeyboardManagerSwift可通过CocoaPods获得，安装它只需将以下行添加到您的Podfile：（＃236）

pod 'IQKeyboardManagerSwift'

在AppDelegate.swift中，只需导入IQKeyboardManagerSwift框架并启用IQKeyboardManager。

import IQKeyboardManagerSwift

@UIApplicationMain
class AppDelegate: UIResponder, UIApplicationDelegate {

    var window: UIWindow?

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

    IQKeyboardManager.sharedManager().enable = true

    return true
    }
}

就是这样。简单！

答案 2 :(得分：19)

我发现能为我完美工作的是：

func textFieldDidBeginEditing(textField: UITextField) {
    if textField == email || textField == password {
        animateViewMoving(true, moveValue: 100)
    }
}

func textFieldDidEndEditing(textField: UITextField) {
    if textField == email || textField == password {
        animateViewMoving(false, moveValue: 100)
    }
}

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()
}

您还可以更改高度值。如果要将其用于所有文本字段，请删除“if语句”。

您甚至可以将此用于需要用户输入的所有控件，如TextView。

答案 3 :(得分：7)

  

当编辑底部字段时，是否有办法让屏幕 移动？

我遇到了类似的问题，发现了一个非常直接的解决方案没有使用scrollView，而是在keyboardWillShow / Hide方法中使用if语句。

func keyboardWillShow(notification: NSNotification) {
    if bottomText.editing{
        self.view.window?.frame.origin.y = -1 * getKeyboardHeight(notification)
    }
}

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

这对我来说是一个很好的解决方案，因为我只有两个文本字段。

仅在编辑某些文本字段（bottomText）时移动整个视图

仅在视图不在原始位置时向下移动整个视图

答案 4 :(得分：5)

只需使用此扩展程序即可在显示键盘时移动任何UIView。

extension UIView {
    func bindToKeyboard(){
        NotificationCenter.default.addObserver(self, selector: #selector(self.keyboardWillChange(_:)), name: NSNotification.Name.UIKeyboardWillChangeFrame, object: nil)
    }

    @objc func keyboardWillChange(_ notification: NSNotification){
        let duration = notification.userInfo![UIKeyboardAnimationDurationUserInfoKey] as! Double
        let curve = notification.userInfo![UIKeyboardAnimationCurveUserInfoKey] as! UInt
        let beginningFrame = (notification.userInfo![UIKeyboardFrameBeginUserInfoKey] as! NSValue).cgRectValue
        let endFrame = (notification.userInfo![UIKeyboardFrameEndUserInfoKey] as! NSValue).cgRectValue

        let deltaY = endFrame.origin.y - beginningFrame.origin.y

        UIView.animateKeyframes(withDuration: duration, delay: 0.0, options: UIViewKeyframeAnimationOptions(rawValue: curve), animations: {
            self.frame.origin.y += deltaY
        }, completion: nil)
    }
}

然后在viewdidload中将视图绑定到键盘

UiView.bindToKeyboard()

答案 5 :(得分：5)

为什么不在UITableViewController中实现呢？键盘在显示时不会隐藏任何文本字段。

答案 6 :(得分：4)

Swift 4（**已更新），扩展名为**

  1. 在一个容器中添加按钮
  2. 使用IBOutlet containerBtmConstrain
    3. 连接容器的底部约束

  3. inViewDidLoad 

    self.containerDependOnKeyboardBottomConstrain = containerBtmConstrain
self.watchForKeyboard()

  4. 添加以下扩展程序

    import UIKit

private var xoAssociationKeyForBottomConstrainInVC: UInt8 = 0

extension UIViewController {

    var containerDependOnKeyboardBottomConstrain :NSLayoutConstraint! {
        get {
            return objc_getAssociatedObject(self, &xoAssociationKeyForBottomConstrainInVC) as? NSLayoutConstraint
        }
        set(newValue) {
            objc_setAssociatedObject(self, &xoAssociationKeyForBottomConstrainInVC, newValue, objc_AssociationPolicy.OBJC_ASSOCIATION_RETAIN)
        }
    }

    func watchForKeyboard() {
        NotificationCenter.default.addObserver(self, selector: #selector(self.keyboardWasShown(notification:)), name:UIResponder.keyboardWillShowNotification, object: nil);
        NotificationCenter.default.addObserver(self, selector: #selector(self.keyboardWillHide(notification:)), name:UIResponder.keyboardWillHideNotification, object: nil);
    }

    @objc func keyboardWasShown(notification: NSNotification) {
        let info = notification.userInfo!
        let keyboardFrame: CGRect = (info[UIResponder.keyboardFrameEndUserInfoKey] as! NSValue).cgRectValue

        UIView.animate(withDuration: 0.3, animations: { () -> Void in
            self.containerDependOnKeyboardBottomConstrain.constant = -keyboardFrame.height
            self.view.layoutIfNeeded()
        })
    }

    @objc func keyboardWillHide(notification: NSNotification) {
        UIView.animate(withDuration: 0.3, animations: { () -> Void in
            self.containerDependOnKeyboardBottomConstrain.constant = 0
            self.view.layoutIfNeeded()
        })
    }
}

答案 7 :(得分：2)

我使用SwiftLint，它对接受的答案的格式有一些问题。具体做法是：

结肠前没有空格， 没有力铸造， 更喜欢UIEdgeInset（顶部：等等......而不是UIEdgeInsetMake。

所以这里是Swift 3的更新

func registerForKeyboardNotifications() {
    //Adding notifies on keyboard appearing
    NotificationCenter.default.addObserver(self, selector: #selector(keyboardWasShown(notification:)), name: NSNotification.Name.UIKeyboardWillShow, object: nil)
    NotificationCenter.default.addObserver(self, selector: #selector(keyboardWillBeHidden(notification:)), name: NSNotification.Name.UIKeyboardWillHide, object: nil)
}

func deregisterFromKeyboardNotifications() {
    //Removing notifies on keyboard appearing
    NotificationCenter.default.removeObserver(self, name: NSNotification.Name.UIKeyboardWillShow, object: nil)
    NotificationCenter.default.removeObserver(self, name: NSNotification.Name.UIKeyboardWillHide, object: nil)
}

func keyboardWasShown(notification: NSNotification) {
    //Need to calculate keyboard exact size due to Apple suggestions
    scrollView?.isScrollEnabled = true
    var info = notification.userInfo!
    if let keyboardSize = (info[UIKeyboardFrameBeginUserInfoKey] as? NSValue)?.cgRectValue.size {
        let contentInsets: UIEdgeInsets = UIEdgeInsets(top: 0.0, left: 0.0, bottom: keyboardSize.height, right: 0.0)

        scrollView?.contentInset = contentInsets
        scrollView?.scrollIndicatorInsets = contentInsets

        var aRect: CGRect = self.view.frame
        aRect.size.height -= keyboardSize.height
        if let activeField = self.activeField {
            if !aRect.contains(activeField.frame.origin) {
                self.scrollView.scrollRectToVisible(activeField.frame, animated: true)
            }
        }
    }
}

func keyboardWillBeHidden(notification: NSNotification) {
    //Once keyboard disappears, restore original positions
    var info = notification.userInfo!
    if let keyboardSize = (info[UIKeyboardFrameBeginUserInfoKey] as? NSValue)?.cgRectValue.size {
        let contentInsets: UIEdgeInsets = UIEdgeInsets(top: 0.0, left: 0.0, bottom: -keyboardSize.height, right: 0.0)
        scrollView?.contentInset = contentInsets
        scrollView?.scrollIndicatorInsets = contentInsets
    }

    view.endEditing(true)
    scrollView?.isScrollEnabled = false
}

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

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

答案 8 :(得分：2)

我认为这个条款是错误的：

if (!CGRectContainsPoint(aRect, activeField!.frame.origin))

虽然activeField的原点可能在键盘上方，但maxY可能不会......

我会为activeField创建一个'max'点并检查它是否在键盘Rect中。

答案 9 :(得分：1)

在下面的示例中，我只是在开始编辑txtLastName或txtCity时向上移动视图。我创建了变量keyboardActive，因为如果我点击txtLastName并在txtCity之后，视图可以向上移动2倍。

看看它是否适合你。

class ViewController: UIViewController, UITextFieldDelegate {

   @IBOutlet weak var txtFirstName: UITextField!
   @IBOutlet weak var txtLastName: UITextField!
   @IBOutlet weak var txtCity: UITextField!

   var keyboardActive = false

   override func viewDidLoad() {
       super.viewDidLoad()
       self.txtFirstName.delegate = self
       self.txtLastName.delegate = self
       self.txtCity.delegate = self
   }

   func textFieldDidBeginEditing(textField: UITextField) {
      if textField != self.txtFirstName && keyboardActive == false {
          self.view.frame.origin.y -= 165
          self.keyboardActive = true
      }
   }

   func textFieldShouldEndEditing(textField: UITextField) -> Bool {
      if textField != self.txtFirstName && keyboardActive == true {
          self.view.frame.origin.y += 165
          self.keyboardActive = false
      }
      return true
   }

   func textFieldShouldReturn(textField: UITextField) -> Bool {
      self.view.endEditing(true)
      return false
   }

}

答案 10 :(得分：1)

在阅读Apple提供的文档和之前的帖子后，这是我的版本。我注意到的一件事是当键盘覆盖时没有处理textView。遗憾的是，Apple的文档无法正常工作，因为无论出于何种原因，在调用textViewDidBeginEditing之后调用键盘。我通过调用一个中央方法来检查键盘是否显示以及是否正在编辑textView或textField。这样，只有当BOTH条件存在时才会触发该过程。

textViews的另一个要点是它们的高度可能会使键盘剪切textView的底部，如果在视图中左上角的点，则不会调整。因此，我编写的代码实际上采用任何textView或textField的屏幕引用的Bottom-Left点，并查看它是否落在所呈现键盘的屏幕引用坐标中，暗示键盘覆盖了它的某些部分。

let aRect : CGRect = scrollView.convertRect(activeFieldRect!, toView: nil)
    if (CGRectContainsPoint(keyboardRect!, CGPointMake(aRect.origin.x, aRect.maxY))) {
        // scroll textView/textField into view
    }

如果您正在使用导航控制器，子类还会将插件的滚动视图自动调整设置为false。

self.automaticallyAdjustsScrollViewInsets = false

它遍历每个textView和textField以设置代理以便处理

    for view in self.view.subviews {
        if view is UITextView {
            let tv = view as! UITextView
            tv.delegate = self
        } else if view is UITextField {
            let tf = view as! UITextField
            tf.delegate = self
        }
    }

只需将基类设置为此处为结果创建的子类。

import UIKit

class ScrollingFormViewController: UIViewController, UITextViewDelegate, UITextFieldDelegate {

var activeFieldRect: CGRect?
var keyboardRect: CGRect?
var scrollView: UIScrollView!

override func viewDidLoad() {

    self.automaticallyAdjustsScrollViewInsets = false

    super.viewDidLoad()

    // Do any additional setup after loading the view.
    self.registerForKeyboardNotifications()
    for view in self.view.subviews {
        if view is UITextView {
            let tv = view as! UITextView
            tv.delegate = self
        } else if view is UITextField {
            let tf = view as! UITextField
            tf.delegate = self
        }
    }
    scrollView = UIScrollView(frame: self.view.frame)
    scrollView.scrollEnabled = false
    scrollView.showsVerticalScrollIndicator = false
    scrollView.showsHorizontalScrollIndicator = false
    scrollView.addSubview(self.view)
    self.view = scrollView
}

override func viewDidLayoutSubviews() {
    scrollView.sizeToFit()
    scrollView.contentSize = scrollView.frame.size
    super.viewDidLayoutSubviews()
}

deinit {
    self.deregisterFromKeyboardNotifications()
}

override func didReceiveMemoryWarning() {
    super.didReceiveMemoryWarning()
    // Dispose of any resources that can be recreated.
}


func registerForKeyboardNotifications()
{
    //Adding notifies on keyboard appearing
    NSNotificationCenter.defaultCenter().addObserver(self, selector: #selector(ScrollingFormViewController.keyboardWasShown), name: UIKeyboardWillShowNotification, object: nil)
    NSNotificationCenter.defaultCenter().addObserver(self, selector: #selector(ScrollingFormViewController.keyboardWillBeHidden), name: UIKeyboardWillHideNotification, object: nil)
}


func deregisterFromKeyboardNotifications()
{
    //Removing notifies on keyboard appearing
    NSNotificationCenter.defaultCenter().removeObserver(self, name: UIKeyboardWillShowNotification, object: nil)
    NSNotificationCenter.defaultCenter().removeObserver(self, name: UIKeyboardWillHideNotification, object: nil)
}

func keyboardWasShown(notification: NSNotification)
{
    let info : NSDictionary = notification.userInfo!
    keyboardRect = (info[UIKeyboardFrameEndUserInfoKey] as? NSValue)?.CGRectValue()
    adjustForKeyboard()
}


func keyboardWillBeHidden(notification: NSNotification)
{
    keyboardRect = nil
    adjustForKeyboard()
}

func adjustForKeyboard() {
    if keyboardRect != nil && activeFieldRect != nil {
        let aRect : CGRect = scrollView.convertRect(activeFieldRect!, toView: nil)
        if (CGRectContainsPoint(keyboardRect!, CGPointMake(aRect.origin.x, aRect.maxY)))
        {
            scrollView.scrollEnabled = true
            let contentInsets : UIEdgeInsets = UIEdgeInsetsMake(0.0, 0.0, keyboardRect!.size.height, 0.0)
            scrollView.contentInset = contentInsets
            scrollView.scrollIndicatorInsets = contentInsets
            scrollView.scrollRectToVisible(activeFieldRect!, animated: true)
        }
    } else {
        let contentInsets : UIEdgeInsets = UIEdgeInsetsZero
        scrollView.contentInset = contentInsets
        scrollView.scrollIndicatorInsets = contentInsets
        scrollView.scrollEnabled = false
    }
}

func textViewDidBeginEditing(textView: UITextView) {
    activeFieldRect = textView.frame
    adjustForKeyboard()
}

func textViewDidEndEditing(textView: UITextView) {
    activeFieldRect = nil
    adjustForKeyboard()
}

func textFieldDidBeginEditing(textField: UITextField)
{
    activeFieldRect = textField.frame
    adjustForKeyboard()
}

func textFieldDidEndEditing(textField: UITextField)
{
    activeFieldRect = nil
    adjustForKeyboard()
}

}

答案 11 :(得分：1)

已经给出了很棒的答案，但这是处理这种情况的另一种方法（使用 Swift 3x ）：

首先在viewWillAppear()

中调用以下方法 
func registerForKeyboardNotifications() {

NotificationCenter.default.addObserver(self, selector: #selector(self.keyboardWasShown), name: NSNotification.Name.UIKeyboardDidShow, object: nil)
NotificationCenter.default.addObserver(self, selector: #selector(self.keyboardWillBeHidden), name: NSNotification.Name.UIKeyboardWillHide, object: nil)

}

现在，对IBOutlet UIView的{​​{1}}个UIViewcontroller个UIView进行约束：（此处UIScrollView是UIScrollView的子视图}这意味着您应该为所有subViews）

设置@IBOutlet weak var loginViewTopConstraint: NSLayoutConstraint! 
UITextFieldDelegate

另一个变量如跟随并添加一个委托，即var activeTextField = UITextField() //This is to keep the reference of UITextField currently active ：

func keyboardWasShown(_ notification: Notification) {

let keyboardInfo  = notification.userInfo as NSDictionary?

//print(keyboardInfo!)

let keyboardFrameEnd: NSValue? = (keyboardInfo?.value(forKey: UIKeyboardFrameEndUserInfoKey) as? NSValue)

let keyboardFrameEndRect: CGRect? = keyboardFrameEnd?.cgRectValue


if activeTextField.frame.origin.y + activeTextField.frame.size.height + 10 > (keyboardFrameEndRect?.origin.y)! {

    UIView.animate(withDuration: 0.3, delay: 0, options: .transitionFlipFromTop, animations: {() -> Void in

        //code with animation

        //Print some stuff to know what is actually happening
        //print(self.activeTextField.frame.origin.y)
        //print(self.activeTextField.frame.size.height)
        //print(self.activeTextField.frame.size.height)

        self.loginViewTopConstraint.constant = -(self.activeTextField.frame.origin.y + self.activeTextField.frame.size.height - (keyboardFrameEndRect?.origin.y)!) - 30.0

        self.view.layoutIfNeeded()

    }, completion: {(_ finished: Bool) -> Void in
        //code for completion

    })
}
}

func keyboardWillBeHidden(_ notification: Notification) {

UIView.animate(withDuration: 0.3, animations: {() -> Void in

    self.loginViewTopConstraint.constant = self.view.frame.origin.y
    self.view.layoutIfNeeded()

})
}

//MARK: textfield delegates
func textFieldShouldBeginEditing(_ textField: UITextField) -> Bool {
    activeTextField = textField
    return true
}

func textFieldShouldReturn(_ textField: UITextField) -> Bool {

           switch textField {
    case YOUR_TEXTFIELD_ONE:
        YOUR_TEXTFIELD_TWO.becomeFirstResponder()
        break
    case YOUR_TEXTFIELD_TWO:
        YOUR_TEXTFIELD_THREE.becomeFirstResponder()
        break
    default:
        textField.resignFirstResponder()
        break
    }
    return true
}

之后是神奇的部分，只需将其粘贴在代码段下面：

//Remove Keyboard Observers
override func viewWillDisappear(_ animated: Bool) {

NotificationCenter.default.removeObserver(self, name: NSNotification.Name.UIKeyboardDidShow, object: nil)

NotificationCenter.default.removeObserver(self, name: NSNotification.Name.UIKeyboardWillHide, object: nil)
}

现在是最后一段：

UITextField

不要忘记将代理人分配到UIStoryboard

中的所有egrep -f file2.txt file1.txt 祝你好运！

答案 12 :(得分：1)

Swift 3语法： 

func textFieldDidBeginEditing(_ textField: UITextField) {
    // add if for some desired textfields
        animateViewMoving(up: true, moveValue: 100)
}

func textFieldDidEndEditing(_ textField: UITextField) {
    // add if for some desired textfields
        animateViewMoving(up: false, moveValue: 100)
}

func animateViewMoving (up:Bool, moveValue :CGFloat){
     textFieldDidEndEditing(_ textField: UITextField) {

    let movementDuration:TimeInterval = 0.5

    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()
}

这是一个很好的方法来获得你想要的东西 你可以添加＆＃34;如果＆＃34;某些文本字段的条件 但这种类型适用于所有人......希望它对每个人都有用

答案 13 :(得分：1)

首先声明一个变量来标识您的活动UITextField。

第1步： -

与var activeTextField: UITextField一样？

第2步： - 在此之后，在viewDidLoad中添加这两行。

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)

第3步： -

现在在控制器类中定义这两个方法。

func keyboardWillShow(_ notification: NSNotification) {

    self.scrollView.isScrollEnabled = true
    var info = notification.userInfo!
    let keyboardSize = (info[UIKeyboardFrameBeginUserInfoKey] as? NSValue)?.cgRectValue.size
    let contentInsets : UIEdgeInsets = UIEdgeInsetsMake(0.0, 0.0, keyboardSize!.height, 0.0)

    self.scrollView.contentInset = contentInsets
    self.scrollView.scrollIndicatorInsets = contentInsets

    var aRect : CGRect = self.view.frame
    aRect.size.height -= keyboardSize!.height
    if let activeField = self.activeField {
        if (!aRect.contains(activeField.frame.origin)){
            self.scrollView.scrollRectToVisible(activeField.frame, animated: true)
        }
    }
}


func keyboardWillHide(_ notification: NSNotification) {

    let contentInsets : UIEdgeInsets = UIEdgeInsetsMake(0.0, 0.0, 0.0, 0.0)
    self.scrollView.contentInset = contentInsets
    self.scrollView.scrollIndicatorInsets = contentInsets
    self.view.endEditing(true)
    self.scrollView.isScrollEnabled = true
}


func textFieldDidBeginEditing(_ textField: UITextField){

    activeField = textField
}

func textFieldDidEndEditing(_ textField: UITextField){

    activeField = nil
}

答案 14 :(得分：1)

  

快速4.2。

     

这将适用于任何形式。无需滚动视图。   不要忘记设置委托。

制作多个uitextfield 

var clickedTextField = UITextField()

在您的可见负载中

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);

了解单击的文本字段。可能您的整个屏幕上都有文本字段。

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

检查键盘是否覆盖文本字段。

@objc func keyboardWillShow(sender: NSNotification,_ textField : UITextField) {
    if let keyboardSize = (sender.userInfo?[UIKeyboardFrameEndUserInfoKey] as? NSValue)?.cgRectValue {

        if clickedTextField.frame.origin.y > keyboardSize.origin.y {
            self.view.frame.origin.y = keyboardSize.origin.y - clickedTextField.center.y - 20
        }
    }
}

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

返回以关闭键盘

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

更新： NSNotification.Name.UIKeyboardWillShow和NSNotification.Name.UIKeyboardWillHide分别被重命名为UIResponder.keyboardWillShowNotification和UIResponder.keyboardWillHideNotification。

答案 15 :(得分：0)

由于在Combine中没有关于如何执行此操作的答案，因此这是我使用的方法。

  1. 我们创建了一个发布者，以同时监听，显示和隐藏通知。
  2. 为了演示，我们从通知// Input Data const weeks = [ [{ name: "Tuesday", sessions: [{ code: "N/A", session: "AM" }, { code: "N/A", session: "PM" } ], date: "2020-09-22T01:00:00.000Z" }, { name: "Wednesday", sessions: [{ code: "N/A", session: "AM" }, { code: "N/A", session: "PM" } ], date: "2020-09-23T01:00:00.000Z" }, { name: "Thursday", sessions: [{ code: "N/A", session: "AM" }, { code: "N/A", session: "PM" } ], date: "2020-09-24T01:00:00.000Z" }, { name: "Friday", sessions: [{ code: "N/A", session: "AM" }, { code: "N/A", session: "PM" } ], date: "2020-09-25T01:00:00.000Z" } ], [{ name: "Monday", sessions: [{ code: "N/A", session: "AM" }, { code: "N/A", session: "PM" } ], date: "2020-09-22T01:00:00.000Z" }, { name: "Tuesday", sessions: [{ code: "N/A", session: "AM" }, { code: "N/A", session: "PM" } ], date: "2020-09-23T01:00:00.000Z" }, { name: "Wednesday", sessions: [{ code: "N/A", session: "AM" }, { code: "N/A", session: "PM" } ], date: "2020-09-24T01:00:00.000Z" }, { name: "Thursday", sessions: [{ code: "N/A", session: "AM" }, { code: "N/A", session: "PM" } ], date: "2020-09-25T01:00:00.000Z" } ] ]; // Actual Code const days = { 0: "Monday", 1: "Tuesday", 2: "Wednesday", 3: "Thursday", 4: "Friday", Monday: 0, Tuesday: 1, Wednesday: 2, Thursday: 3, Friday: 4 }; function handleWeek(week) { const referenceDate = new Date(week[0].date), referenceIndex = days[week[0].name]; const weekObject = week.reduce((acc, cv) => (Object.assign(Object.assign({}, acc), { [cv.name]: cv })), {}); return Object.keys(days) .filter(key => !isNaN(+key)) .sort() .map((dayIndex, index) => { const day = days[dayIndex]; return weekObject[day] ? weekObject[day] : { name: day, sessions: [{ code: "N/A", session: "AM" }, { code: "N/A", session: "PM" } ], date: referenceIndex < index ? new Date(new Date(referenceDate).setDate(referenceDate.getDate() + (index - referenceIndex))).toISOString() : new Date(new Date(referenceDate).setDate(referenceDate.getDate() - (referenceIndex - index))).toISOString() }; }); } const result = weeks.map(week => handleWeek(week)); console.log(result);获取键盘框架，并检查其中是否包含current active responder。如果已覆盖，请返回键盘框架的高度。如果未覆盖返回0，则我们不希望移动框架。对于隐藏通知，我们只需返回0。
userInfo

在private var keyboardHeightPublisher: AnyPublisher<CGFloat, Never> { Publishers.Merge( NotificationCenter.default .publisher(for: UIResponder.keyboardWillShowNotification) .compactMap { $0.userInfo?[UIResponder.keyboardFrameEndUserInfoKey] as? CGRect } .map { $0.intersects(self.view.firstResponder!.frame) ? $0.height : 0 } .map { $0 * -1 }, NotificationCenter.default .publisher(for: UIResponder.keyboardWillHideNotification) .map { _ in CGFloat(0) } ).eraseToAnyPublisher() } 中，我们只订阅发布者即可相应地更改视图框架。

viewDidLoad

编辑
小心！如果override func viewDidLoad() { super.viewDidLoad() keyboardHeightPublisher.sink{ [weak self] height in self?.view.frame.origin.y = height }.store(in: &cancelables) } 在子视图中，则必须计算与整个屏幕相对应的帧，以检查它们是否真正相交。
示例：

firstResponder

答案 16 :(得分：0)

快速：您可以通过检查要显示的文本字段来实现。

@objc func keyboardWillShow(notification: NSNotification) {
    if self.textField.isFirstResponder == true {
        self.view.frame.origin.y -= 150
     }
}

@objc func keyboardWillHide(notification: NSNotification){
    if self.textField.isFirstResponder == true {
       self.view.frame.origin.y += 150
    }
}

答案 17 :(得分：0)

对于Swift 4.2

此代码将允许您控制特定设备屏幕尺寸的框架的Y轴力矩。

PS：此代码不会根据TextField的位置智能地移动框架。

为UIDevice创建扩展 

extension UIDevice {
    enum ScreenType: String {
        case iPhone4_4S = "iPhone 4 or iPhone 4s"
        case iPhones_5_5s_5c_SE = "iPhone 5, iPhone 5s, iPhone 5c or iPhone SE"
        case iPhones_6_6s_7_8 = "iPhone 6, iPhone 6s, iPhone 7 or iPhone 8"
        case iPhones_6Plus_6sPlus_7Plus_8Plus = "iPhone 6 Plus, iPhone 6s Plus, iPhone 7 Plus or iPhone 8 Plus"
        case iPhoneX_Xs = "iPhone X, iPhone Xs"
        case iPhoneXR = "iPhone XR"
        case iPhoneXSMax = "iPhone Xs Max"
        case unknown
    }
    var screenType: ScreenType {
        switch UIScreen.main.nativeBounds.height {
        case 960:
            return .iPhone4_4S
        case 1136:
            return .iPhones_5_5s_5c_SE
        case 1334:
            return .iPhones_6_6s_7_8
        case 1920, 2208:
            return .iPhones_6Plus_6sPlus_7Plus_8Plus
        case 1792:
            return .iPhoneXR
        case 2436:
            return .iPhoneX_Xs
        case 2688:
            return .iPhoneXSMax
        default:
            return .unknown
        }
    }
}

在viewDidLoad上添加NotificationObserver 

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

选择器 

@objc func keyboardWillShow(notification: NSNotification) {
    if ((notification.userInfo?[UIResponder.keyboardFrameBeginUserInfoKey] as? NSValue)?.cgRectValue) != nil {
        if self.view.frame.origin.y == 0 {
            switch (UIDevice.current.screenType.rawValue) {
            case (UIDevice.ScreenType.iPhones_5_5s_5c_SE.rawValue):
                self.view.frame.origin.y -= 210
            case (UIDevice.ScreenType.iPhones_6_6s_7_8.rawValue):
                self.view.frame.origin.y -= 110
            case (UIDevice.ScreenType.iPhones_6Plus_6sPlus_7Plus_8Plus.rawValue):
                self.view.frame.origin.y -= 80
            case (UIDevice.ScreenType.iPhoneX_Xs.rawValue):
                self.view.frame.origin.y -= 70
            case (UIDevice.ScreenType.iPhoneXR.rawValue):
                self.view.frame.origin.y -= 70
            case (UIDevice.ScreenType.iPhoneXSMax.rawValue):
                self.view.frame.origin.y -= 70
            default:
                self.view.frame.origin.y -= 150
            }
        }
    }
}

@objc func keyboardWillHide(notification: NSNotification) {
    if ((notification.userInfo?[UIResponder.keyboardFrameBeginUserInfoKey] as? NSValue)?.cgRectValue) != nil {
        if self.view.frame.origin.y != 0 {
            switch (UIDevice.current.screenType.rawValue) {
            case (UIDevice.ScreenType.iPhones_5_5s_5c_SE.rawValue):
                self.view.frame.origin.y += 210
            case (UIDevice.ScreenType.iPhones_6_6s_7_8.rawValue):
                self.view.frame.origin.y += 110
            case (UIDevice.ScreenType.iPhones_6Plus_6sPlus_7Plus_8Plus.rawValue):
                self.view.frame.origin.y += 80
            case (UIDevice.ScreenType.iPhoneX_Xs.rawValue):
                self.view.frame.origin.y += 70
            case (UIDevice.ScreenType.iPhoneXR.rawValue):
                self.view.frame.origin.y += 70
            case (UIDevice.ScreenType.iPhoneXSMax.rawValue):
                self.view.frame.origin.y += 70
            default:
                self.view.frame.origin.y += 150
            }
        }
    }
}

答案 18 :(得分：0)

为Swift 4.2重写

在ViewDidLoad中。

 NotificationCenter.default.addObserver(self, selector: #selector(trailViewController.keyboardWasShown), name: UIResponder.keyboardWillShowNotification, object: nil)
 NotificationCenter.default.addObserver(self, selector: #selector(trailViewController.keyboardWillBeHidden), name: UIResponder.keyboardWillHideNotification, object: nil)

剩余功能

func registerForKeyboardNotifications(){
    //Adding notifies on keyboard appearing
    NotificationCenter.default.addObserver(self, selector: #selector(keyboardWasShown(notification:)), name: UIResponder.keyboardWillShowNotification, object: nil)
    NotificationCenter.default.addObserver(self, selector: #selector(keyboardWillBeHidden(notification:)), name: UIResponder.keyboardWillHideNotification, object: nil)
}

func deregisterFromKeyboardNotifications(){
    //Removing notifies on keyboard appearing
    NotificationCenter.default.removeObserver(self, name: UIResponder.keyboardWillShowNotification, object: nil)
    NotificationCenter.default.removeObserver(self, name: UIResponder.keyboardWillHideNotification, object: nil)
}

@objc func keyboardWasShown(notification: NSNotification){
    //Need to calculate keyboard exact size due to Apple suggestions
    self.scrollView.isScrollEnabled = true
    var info = notification.userInfo!
    let keyboardSize = (info[UIResponder.keyboardFrameBeginUserInfoKey] as? NSValue)?.cgRectValue.size
    let contentInsets : UIEdgeInsets = UIEdgeInsets(top: 0.0, left: 0.0, bottom: keyboardSize!.height, right: 0.0)

    self.scrollView.contentInset = contentInsets
    self.scrollView.scrollIndicatorInsets = contentInsets

    var aRect : CGRect = self.view.frame
    aRect.size.height -= keyboardSize!.height
    if let activeField = self.activeField {
        if (!aRect.contains(activeField.frame.origin)){
            self.scrollView.scrollRectToVisible(activeField.frame, animated: true)
        }
    }
}

@objc func keyboardWillBeHidden(notification: NSNotification){
    //Once keyboard disappears, restore original positions
    var info = notification.userInfo!
    let keyboardSize = (info[UIResponder.keyboardFrameBeginUserInfoKey] as? NSValue)?.cgRectValue.size
    let contentInsets : UIEdgeInsets = UIEdgeInsets(top: 0.0, left: 0.0, bottom: -keyboardSize!.height, right: 0.0)
    self.scrollView.contentInset = contentInsets
    self.scrollView.scrollIndicatorInsets = contentInsets
    self.view.endEditing(true)
    self.scrollView.isScrollEnabled = false
}

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

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

答案 19 :(得分：0)

Swift 4.2

我的解决方案将视图垂直放置在UITextField上，如果其位置在键盘下方。

步骤1：创建新的swift文件并复制粘贴UIViewWithKeyboard类。
步骤2：在Interface Builder中，将其设置为最热门的UIView的自定义类。

import UIKit

class UIViewWithKeyboard: UIView {
    @IBInspectable var offsetMultiplier: CGFloat = 0.75
    private var keyboardHeight = 0 as CGFloat
    private weak var activeTextField: UITextField?
    override func awakeFromNib() {
        super.awakeFromNib()
        NotificationCenter.default.addObserver(self, selector: #selector(UIViewWithKeyboard.textDidBeginEditing),
                                               name: UITextField.textDidBeginEditingNotification, object: nil)
        NotificationCenter.default.addObserver(self, selector: #selector(UIViewWithKeyboard.keyboardWillShow),
                                               name: UIResponder.keyboardWillShowNotification, object: nil)
        NotificationCenter.default.addObserver(self, selector: #selector(UIViewWithKeyboard.keyboardWillHide),
                                               name: UIResponder.keyboardWillHideNotification, object: nil)
    }

    @objc func textDidBeginEditing(_ notification: NSNotification) {
        self.activeTextField = notification.object as? UITextField
    }

    @objc func keyboardWillShow(_ notification: Notification) {
        if let frameValue = notification.userInfo?[UIResponder.keyboardFrameEndUserInfoKey] as? NSValue {
            keyboardHeight = frameValue.cgRectValue.size.height
            if let textField = self.activeTextField {
                let offset = textField.frame.maxY < frame.maxY - keyboardHeight ? 0
                           : textField.frame.maxY - (frame.maxY - keyboardHeight) * offsetMultiplier
                self.setView(offset: offset)
            }
        }
    }

    @objc func keyboardWillHide(_ notification: NSNotification) {
        self.setView(offset: 0)
    }

    func setView(offset: CGFloat) {
        UIView.animate(withDuration: 0.25) {
            self.bounds.origin.y = offset
        }
    }
}

答案 20 :(得分：0)

“我忘了提到我是Swift的新手:(检查这个的正确语法是什么？（如何在此函数中获取字段名称？）”

好的。首先确认UITextFieldDelegate协议

class YourClass:UITextFieldDelegate

然后实现功能

func textFieldDidBeginEditing(textField: UITextField!) {

    if textField == txtOne
    {
        println("TextOne")
    }
    if textField == txtTwo
    {
        println("TextTwo")
    }
}

您应该注意，正确的方法是使用滚动视图并放置应在滚动视图中向上/向下移动的视图并相应地处理键盘事件

答案 21 :(得分：0)

Swift 4

您可以使用带动画的键盘轻松上下移动UITextField

enter image description here 

import UIKit

class ViewController: UIViewController {

    @IBOutlet var textField: UITextField!

    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

        UIView.animateKeyframes(withDuration: duration, delay: 0.0, options: UIViewKeyframeAnimationOptions(rawValue: curve), animations: {
            self.textField.frame.origin.y+=deltaY

        },completion: nil)
    }

答案 22 :(得分：0)

Swift 4更新了我的解决方案

键盘上的约束动画显示/隐藏， 享受。

import Foundation
import UIKit

class PhoneController: UIViewController, UITextFieldDelegate{

    var phoneLayoutYConstraint: NSLayoutConstraint?

    override func viewDidLoad() {

        super.viewDidLoad()

        view.backgroundColor = .white

        NotificationCenter.default.addObserver(self, selector: #selector(handleKeyBoardNotification(_:)), name: NSNotification.Name.UIKeyboardWillShow, object: nil)
        NotificationCenter.default.addObserver(self, selector: #selector(handleKeyBoardNotification(_:)), name: NSNotification.Name.UIKeyboardWillHide, object: nil)
        phoneField.delegate = self

        view.addSubview(phoneField)

        NSLayoutConstraint.activate([phoneField.heightAnchor.constraint(equalToConstant: 50),
                                     phoneField.centerXAnchor.constraint(equalTo: view.centerXAnchor),
                                     phoneField.leadingAnchor.constraint(equalTo: view.leadingAnchor, constant: 20),
                                     phoneField.trailingAnchor.constraint(equalTo: view.trailingAnchor, constant: -20)])

        phoneLayoutYConstraint = NSLayoutConstraint(item: phoneField, attribute: .bottom, relatedBy: .equal, toItem: view, attribute: .bottom, multiplier: 1, constant: 0)
        phoneLayoutYConstraint?.isActive = true

    }

    let phoneField: UITextField = {
        let text = UITextField()
        text.translatesAutoresizingMaskIntoConstraints = false
        text.keyboardType = .numberPad
        text.font = UIFont.systemFont(ofSize: 30)
        text.layer.cornerRadius = 5.0
        text.layer.masksToBounds = true
        text.layer.borderColor = UIColor.darkGray.cgColor
        text.layer.borderWidth = 2.0

        return text
    }()


    override func viewDidDisappear(_ animated: Bool) {
        super.viewWillDisappear(animated)
        NotificationCenter.default.removeObserver(self)
    }

    func textFieldDidBeginEditing(_ textField: UITextField) {

    }


    func textFieldDidEndEditing(_ textField: UITextField) {

    }

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


   @objc func handleKeyBoardNotification(_ notification: NSNotification) {

        if let info = notification.userInfo {

            let keyboardSize = (info[UIKeyboardFrameBeginUserInfoKey] as? NSValue)?.cgRectValue.size
            let isKeyBoardShowing = notification.name == NSNotification.Name.UIKeyboardWillShow

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


            phoneLayoutYConstraint?.constant = isKeyBoardShowing ? -keyboardSize!.height : 0

            UIView.animate(withDuration: 0, delay: 0, options: .curveEaseOut, animations: {
                self.view.layoutIfNeeded()
            }, completion: { (boo) in

            })

        }
    }

}

答案 23 :(得分：0)

接受的anwser几乎是完美的。但我需要使用UIKeyboardFrameEndUserInfoKey而不是UIKeyboardFrameBeginUserInfoKey,，因为后者返回keyborad height 0.并将hittest点更改为底部而不是原点。 

    var aRect : CGRect = self.view.frame
    aRect.size.height -= keyboardSize!.height
    if let activeField = self.activeField {
        var point = activeField.frame.origin
        point.y += activeField.frame.size.height
        if (!aRect.contains(point)){
            self.scrollView.scrollRectToVisible(activeField.frame, animated: true)
        }
    }

答案 24 :(得分：0)

Swift 3 

@IBOutlet var scrollView: UIScrollView!
@IBOutlet var edtEmail: UITextField!
@IBOutlet var bottomTextfieldConstrain: NSLayoutConstraint! // <- this guy is the constrain that connect the bottom of textField to lower object or bottom of page!

 @IBAction func edtEmailEditingDidBegin(_ sender: Any) { 
        self.bottomTextfieldConstrain.constant = 200
        let point = CGPoint(x: 0, y: 200)
        scrollView.contentOffset = point
    }

@IBAction func edtEmailEditingDidEnd(_ sender: Any) { 
    self.bottomTextfieldConstrain.constant = 50
}

答案 25 :(得分：0)

此代码向上移动您正在编辑的文本字段，以便您可以在Swift 3中查看它以获得此答案，您还必须使您的视图成为UITextFieldDelegate：

var moveValue: CGFloat!
var moved: Bool = false
var activeTextField = UITextField()

func textFieldDidBeginEditing(_ textField: UITextField) {
    self.activeTextField = textField
}
func textFieldDidEndEditing(_ textField: UITextField) {
    if moved == true{
    self.animateViewMoving(up: false, moveValue: moveValue )
        moved = false
    }
}
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()
}

然后在viewDidLoad中：

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

哪些电话（在viewDidLoad之外）：

func keyboardWillShow(notification: Notification) {
    if let keyboardSize = (notification.userInfo?[UIKeyboardFrameBeginUserInfoKey] as? NSValue)?.cgRectValue {
        let keyboardHeight = keyboardSize.height
        if (view.frame.size.height-self.activeTextField.frame.origin.y) - self.activeTextField.frame.size.height < keyboardHeight{
            moveValue = keyboardHeight - ((view.frame.size.height-self.activeTextField.frame.origin.y) - self.activeTextField.frame.size.height)
            self.animateViewMoving(up: true, moveValue: moveValue )
            moved = true
        }
    }
}

答案 26 :(得分：-2)

通过以下步骤解决了ReactNative android和IOS应用中的此类问题。

像这样安装软件包。

 $ npm install --save react-native-keyboard-spacer

现在将键盘分隔符导入到React Native项目中的js或jsx文件中。

 import React, { Component } from 'react';
 import KeyboardSpacer from 'react-native-keyboard-spacer';
 import { View, Text, TextInput } from 'react-native';

 export default class Sample extends Component{
    render(){
       return(
           <View style={{flex: 1}}>
              <TextInput 
                  placeholderTextColor="£000000"
                  underlineColorAndroid="transparent"
                  keyboardType="default"
                  maxLength={30}
                  placeholder={'Enter your text!'} />

              <TextInput placeholder={"another text field"} />

              <TextInput placeholder={"another text field"} />

              {/* now place the below component after your input fields form block or view */}

             <KeyboardSpacer/>
          </View>
       );
    }
 }

然后，解决书写时隐藏文本字段的键盘问题。

   Note: It will work both IOS and Android React Native apps.

   Hope It is helpful to others.
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