这段代码对我有用。

@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。

如果是多个文字字段

我只针对位于底部的文本字段（不使用通知观察者）实现。

如果您使用的是 scrollView ，则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)
}

如果要根据视图设置文本字段位置，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)
}

专门针对底部的文本字段。在 textFieldDidBeginEditing

中检查其代码值 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，最好使用通知观察器

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

为Uiview添加一个扩展：

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()
    })
}

}

Answer 5

对我来说很完美： http://www.seemuapps.com/move-uitextfield-when-keyboard-is-presented

如果代表设置正确，

 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()
    }

键盘覆盖视图底部的文本字段

5 个答案:

这段代码对我有用。