键盘覆盖了我视图底部的文本字段

Question

我已经搜索过了

这里：Move a view up only when the keyboard covers an input field

这里：Move textfield when keyboard appears swift

这里：How to make a UITextField move up when keyboard is present?

这里：https://developer.apple.com/library/content/documentation/StringsTextFonts/Conceptual/TextAndWebiPhoneOS/KeyboardManagement/KeyboardManagement.html

不幸的是，我能找到的所有链接以及似乎其他任何地方都没有提供我正在寻找的良好干净的解决方案。它们要么在 Obj-c 代码中过时，要么在 Xcode 9 的当前迭代中无法使用 Swift 4。

如何管理覆盖视图底部文本字段的键盘？我希望屏幕视图仅在键盘覆盖文本字段视图时移动，而不使用滚动视图，能够对其进行动画处理以使其看起来很漂亮，而不是让它只是快照，最重要的是我不想使用外部库。

Apple 的 CoreAnimation 库非常棒，但所有示例代码都已过时，并且在目标 c 中已被弃用（我不敢相信 Apple 没有更新他们的文档）。

如果有人可以为我指出正确的方向来更新和当前代码或我缺少的 Apple 库来专门解决这个问题，我将不胜感激。

Answer 1

您可以使用 IQKeyboardManagerSwift 轻松快速地解决您的问题。

在你的 pod 文件中使用下面的 pod，它支持 Swift 4。

pod 'IQKeyboardManagerSwift', '5.0.0'

这里是实现 IQKeyboardManagerSwift 的链接。

https://github.com/hackiftekhar/IQKeyboardManager

谢谢！！！

Answer 2

此代码将起作用，如果它的框架与键盘的框架相交，则使您的 textField 动画到键盘上方，并动画回到键盘隐藏的原始位置。

@IBOutlet weak var textField: UITextField!

  var offsetY:CGFloat = 0

  override func viewWillAppear(_ animated: Bool) {
    super.viewWillAppear(animated)
    NotificationCenter.default.addObserver(self, selector: #selector(ViewController.keyboardFrameChangeNotification(notification:)), name: NSNotification.Name.UIKeyboardWillChangeFrame, object: nil)
  }

  func keyboardFrameChangeNotification(notification: Notification) {
    if let userInfo = notification.userInfo {
      let endFrame = userInfo[UIKeyboardFrameEndUserInfoKey] as? CGRect
      let animationDuration = userInfo[UIKeyboardAnimationDurationUserInfoKey] as? Double ?? 0
      let animationCurveRawValue = (userInfo[UIKeyboardAnimationCurveUserInfoKey] as? Int) ?? Int(UIViewAnimationOptions.curveEaseInOut.rawValue)
      let animationCurve = UIViewAnimationOptions(rawValue: UInt(animationCurveRawValue))
      if let _ = endFrame, endFrame!.intersects(self.textField.frame) {
        self.offsetY = self.textField.frame.maxY - endFrame!.minY
        UIView.animate(withDuration: animationDuration, delay: TimeInterval(0), options: animationCurve, animations: {
          self.textField.frame.origin.y = self.textField.frame.origin.y - self.offsetY
        }, completion: nil)
      } else {
        if self.offsetY != 0 {
          UIView.animate(withDuration: animationDuration, delay: TimeInterval(0), options: animationCurve, animations: {
            self.textField.frame.origin.y = self.textField.frame.origin.y + self.offsetY
            self.offsetY = 0
          }, completion: nil)
        }
      }
    }
  }

Answer 3

这段代码对我有用。

如果有多个文本字段

我只为底部的文本字段实现了（不使用通知观察者）。

如果您使用的是 scrollView，此代码可能会有所帮助 （scrollViewDidScroll 是可选的）

func scrollViewDidScroll(_ scrollView: UIScrollView) {
    scrollView.contentSize = CGSize(width: self.scrollView.frame.size.width, height: (scrollView.frame.size.height + 300))// To be more specific, I have used multiple textfields so wanted to scroll to the end.So have given the constant 300.
}

func textFieldDidBeginEditing(_ textField:UITextField) {
    self.scrollView.setContentOffset(textField.frame.origin, animated: true)
}

如果你想根据视图设置文本字段的位置， 试试这个：

func textFieldDidBeginEditing(_ textField:UITextField){
    textField.frame.origin.y = textField.frame.origin.y - 150 //(If have not used contentsizing the scroll view then exclude this line)default origin takes the texfield to the top of the view.So to set lower textfields to proper position have used the constant 150.
    self.scrollView.setContentOffset(textField.frame.origin, animated: true)
}

专门为底部的文本字段做。在 textFieldDidBeginEditing

中检查他们的标签值 textfield.tag

func textFieldDidBeginEditing(_ textField:UITextField){
    if textField.tag = 4 { //tag value of the textfield which are at the bottom
        self.scrollView.setContentOffset(textField.frame.origin, animated: true)
    }
}

如果您在 tableView 中实现了文本字段，请使用下面解释的通知观察器。

如果 tableView 中有多个文本字段，最好使用 Notification Observer

override func viewDidAppear(_ animated: Bool) {
    NotificationCenter.default.addObserver(self, selector: #selector(keyboardWillShow(notification:)), name: NSNotification.Name.UIKeyboardDidShow, object: nil)
    NotificationCenter.default.addObserver(self, selector: #selector(keyboardWillHide(notification:)), name: NSNotification.Name.UIKeyboardDidHide, object: nil)
}

@objc func keyboardWillShow(notification: NSNotification) {
    if let keyboardHeight = (notification.userInfo?[UIKeyboardFrameEndUserInfoKey] as? NSValue)?.cgRectValue.height {
        self.tableView.contentInset = UIEdgeInsetsMake(0, 0, keyboardHeight, 0)
    }
}

@objc func keyboardWillHide(notification: NSNotification) {
    UIView.animate(withDuration: 0.2, animations: {
        // For some reason adding inset in keyboardWillShow is animated by itself but removing is not, that's why we have to use animateWithDuration here
        self.tableView.contentInset = UIEdgeInsetsMake(0, 0, 0, 0)
    })
}

deinit {
    print("denit")
    NotificationCenter.default.removeObserver(self)
}

Answer 4

非常适合我： http://www.seemuapps.com/move-uitextfield-when-keyboard-is-presented

如果代理设置正确，

 func textFieldDidBeginEditing(_ textField: UITextField) {
        moveTextField(textField, moveDistance: -250, up: true)
    }

    // Finish Editing The Text Field
    func textFieldDidEndEditing(_ textField: UITextField) {
        moveTextField(textField, moveDistance: -250, up: false)
    }

    // Hide the keyboard when the return key pressed
    func textFieldShouldReturn(_ textField: UITextField) -> Bool {
        textField.resignFirstResponder()
        return true
    }

    // Move the text field in a pretty animation!
    func moveTextField(_ textField: UITextField, moveDistance: Int, up: Bool) {
        let moveDuration = 0.3
        let movement: CGFloat = CGFloat(up ? moveDistance : -moveDistance)

        UIView.beginAnimations("animateTextField", context: nil)
        UIView.setAnimationBeginsFromCurrentState(true)
        UIView.setAnimationDuration(moveDuration)
        self.view.frame = self.view.frame.offsetBy(dx: 0, dy: movement)
        UIView.commitAnimations()
    }

Answer 5

为 Uiview 添加扩展：

import UIKit

//将视图绑定到键盘更改 扩展 UIView {

func bindToKeyboard(){
    NotificationCenter.default.addObserver(self, selector: #selector(UIView.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 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.frame.origin.y += deltaY

    },completion: {(true) in
        self.layoutIfNeeded()
    })
}

}