当用户单击UIWebView中的文本字段时出现键盘后屏幕不再移动

Question

我有一个iPhone应用程序（Swift 3），其内容动态地从CMS加载登录。该表格包含用户需要输入和提交的字段，没有什么棘手的。

不幸的是，当用户点击登录字段时，键盘出现，并且它隐藏了包含表单的UIWebView。

我该如何解决这个问题？
Please Check Screenshot, click the form hiding my UIWebView Contents

Answer 1

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) 

} 


func keyboardWillShow(notification: NSNotification) { 

    if let keyboardSize = (notification.userInfo?[UIKeyboardFrameBeginUserInfoKey] as? NSValue)?.cgRectValue { 

      self.view.frame.origin.y = -keyboardSize.height/2 
    } 
} 

func keyboardWillHide(notification: NSNotification) { 

    if let _ = (notification.userInfo?[UIKeyboardFrameBeginUserInfoKey] as? NSValue)?.cgRectValue { 

      self.view.frame.origin.y = 0 
    } 
} 

Answer 2

试试这个代码，这会为工作斯威夫特3。在这种情况下，我给出了4个textFields

import UIKit 

class ViewController: UIViewController, UITextFieldDelegate { 

    @IBOutlet weak var textField4: UITextField! 
    @IBOutlet weak var textField3: UITextField! 
    @IBOutlet weak var textField2: UITextField! 
    @IBOutlet weak var textField1: UITextField! 

    override func viewWillDisappear(_ animated: Bool) 
    { 
    view.endEditing(true) 
    } 

    override func viewDidLoad() { 
     super.viewDidLoad() 

     self.textField1.delegate = self 
     self.textField2.delegate = self 
     self.textField3.delegate = self 
     self.textField4.delegate = self 

     self.textField1.tag = 0 
     self.textField2.tag = 1 
     self.textField3.tag = 2 
     self.textField4.tag = 3 
    } 

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

    func textFieldDidBeginEditing(_ textField: UITextField) { 
     switch textField.tag { 
     case 0: 
      moveTextField(textField: textField, moveDistance: -120, up: true) 
     case 1: 
      moveTextField(textField: textField, moveDistance: -140, up: true) 
     case 2: 
      moveTextField(textField: textField, moveDistance: -160, up: true) 
     case 3: 
      moveTextField(textField: textField, moveDistance: -180, up: true) 
     default: 
      print("Do Nothing...!") 
     } 
    } 

    func textFieldDidEndEditing(_ textField: UITextField) { 
     switch textField.tag { 
     case 0: 
      moveTextField(textField: textField, moveDistance: -120, up: false) 
     case 1: 
      moveTextField(textField: textField, moveDistance: -140, up: false) 
     case 2: 
      moveTextField(textField: textField, moveDistance: -160, up: false) 
     case 3: 
      moveTextField(textField: textField, moveDistance: -180, up: false) 
     default: 
      print("Do Nothing...!") 
     } 
    } 


    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() 
    } 
}