如何以编程方式在swift ios中自动将光标从一个文本字段移动到另一个文本字段？

Question

func textFieldDidBeginEditing(textField: UITextField) { 
    scrlView.setContentOffset(CGPointMake(0, textField.frame.origin.y-70), animated: true) 


    if(textField == firstDigit){ 

     textField.becomeFirstResponder() 
     secondDigit.resignFirstResponder() 
    } 


    else if(textField == secondDigit){ 

     textField.becomeFirstResponder() 
     thirdDigit.resignFirstResponder() 
    } 

    else if(textField == thirdDigit){ 
     //textField.becomeFirstResponder() 
     fourthDigit.becomeFirstResponder() 
    } 

对于一次只能输入一个数字的OTP条目，我使用了四个文本字段。输入数字后，我需要将光标自动移动到下一个文本框。

Answer 1

设置文本框的委托，并添加目标：

override func viewDidLoad() { 
     super.viewDidLoad() 

     first.delegate = self 
     second.delegate = self 
     third.delegate = self 
     fourth.delegate = self 


     first.addTarget(self, action: "textFieldDidChange:", forControlEvents: UIControlEvents.EditingChanged) 
     second.addTarget(self, action: "textFieldDidChange:", forControlEvents: UIControlEvents.EditingChanged) 
     third.addTarget(self, action: "textFieldDidChange:", forControlEvents: UIControlEvents.EditingChanged) 
     fourth.addTarget(self, action: "textFieldDidChange:", forControlEvents: UIControlEvents.EditingChanged) 
    } 

现在，当文本的改变而改变文本框

而最后，当用户开始编辑文本框清晰

extension ViewController: UITextFieldDelegate{ 
    func textFieldDidBeginEditing(textField: UITextField) { 
     textField.text = "" 
    } 
} 

Answer 2

**从调用UITextfieldDelegate函数并使下一个文本字段成为第一响应者，并且不需要添加targ等并记得设置在viewDidLoad中所有文本字段的代表**

  extension ViewController : UITextFieldDelegate { 


      func textFieldShouldReturn(textField: UITextField) -> Bool { 

       nextTextFieldToFirstResponder(textField) 

       return true; 
      } 




      func nextTextFieldToFirstResponder(textField: UITextField) { 

      if textField == emailTextField 
      { 
       self.firstNameTextField.becomeFirstResponder() 
      } 
      else if textField == firstNameTextField { 

       self.lastNameTextField.becomeFirstResponder() 
      } 

      else if textField == lastNameTextField { 

       self.passwordTextField.becomeFirstResponder() 
      } 

      else if textField == passwordTextField { 

       self.confirmPassTextField.becomeFirstResponder() 
      } 

      else if textField == confirmPassTextField { 
       self.confirmPassTextField.resignFirstResponder() 

      } 

      } 

Answer 3

我已经尝试了许多代码，最后这雨燕3.0最新[2017年三月]

的“视图控制器”为我工作类应继承“UITextFieldDelegate”以使此代码正常工作。

class ViewController: UIViewController,UITextFieldDelegate 

添加文本字段与正确的代码nuber这个标签号码是用来采取基于分配给它的增量标签数量控制到合适的文本字段。

override func viewDidLoad() { 

userNameTextField.delegate = self 

     userNameTextField.tag = 0 

     userNameTextField.returnKeyType = UIReturnKeyType.next 

     passwordTextField.delegate = self 

     passwordTextField.tag = 1 


     passwordTextField.returnKeyType = UIReturnKeyType.go 

} 

在上面的代码中，“returnKeyType = UIReturnKeyType.next”，其中将键盘回车键显示为“下一个”你也有其他选择“加入/去”等，根据您的应用程序更改值。

这种“textFieldShouldReturn”是控制UITextFieldDelegate的方法，并有下一个字段选择基于标签值增量

func textFieldShouldReturn(_ textField: UITextField) -> Bool 

    { 

     if let nextField = textField.superview?.viewWithTag(textField.tag + 1) as? UITextField { 

      nextField.becomeFirstResponder() 

     } else { 

      textField.resignFirstResponder() 

      return true; 

     } 

     return false 

    } 

Answer 4

首先我们需要来设置的UITextField标签在这里我们;

func textFieldShouldReturnSingle(_ textField: UITextField , newString : String) 
{ 
    let nextTag: Int = textField.tag + 1 

    let nextResponder: UIResponder? = textField.superview?.superview?.viewWithTag(nextTag) 
    textField.text = newString 
    if let nextR = nextResponder 
    { 
     // Found next responder, so set it. 
     nextR.becomeFirstResponder() 
    } 
    else 
    { 
     // Not found, so remove keyboard. 
     textField.resignFirstResponder() 
    } 
} 

func textField(_ textField: UITextField, shouldChangeCharactersIn range: NSRange, replacementString string: String) -> Bool { 

    let newString = ((textField.text)! as NSString).replacingCharacters(in: range, with: string) 

    let newLength = newString.characters.count 

    if newLength == 1 { 
     textFieldShouldReturnSingle(textField , newString : newString) 
     return false 
    } 

    return true 
} 

注：需要的UITextField只有一个字符，数字格式，这是在OTP格式。

Answer 5

为SWIFT 3

func textField(_ textField: UITextField, shouldChangeCharactersIn range: NSRange, replacementString string: String) -> Bool { 
    // On inputing value to textfield 
    if ((textField.text?.characters.count)! < 1 && string.characters.count > 0){ 
     let nextTag = textField.tag + 1; 

     // get next responder 
     let nextResponder = textField.superview?.viewWithTag(nextTag); 
     textField.text = string; 

     if (nextResponder == nil){ 
      textField.resignFirstResponder() 
     } 
     nextResponder?.becomeFirstResponder(); 
     return false; 
    } 
    else if ((textField.text?.characters.count)! >= 1 && string.characters.count == 0){ 
     // on deleting value from Textfield 
     let previousTag = textField.tag - 1; 

     // get next responder 
     var previousResponder = textField.superview?.viewWithTag(previousTag); 

     if (previousResponder == nil){ 
      previousResponder = textField.superview?.viewWithTag(1); 
     } 
     textField.text = ""; 
     previousResponder?.becomeFirstResponder(); 
     return false; 
    } 
    return true; 
} 

Answer 6

解决方案对于斯威夫特4

在这个解决方案，你会去到下一个字段。当您按删除时将出现在前一个文本字段中。

第1步：设置选择器文本字段

override func viewDidLoad() { 
     super.viewDidLoad() 

     otpTextField1.addTarget(self, action: #selector(self.textFieldDidChange(textField:)), for: UIControlEvents.editingChanged) 
     otpTextField2.addTarget(self, action: #selector(self.textFieldDidChange(textField:)), for: UIControlEvents.editingChanged) 
     otpTextField3.addTarget(self, action: #selector(self.textFieldDidChange(textField:)), for: UIControlEvents.editingChanged) 
     otpTextField4.addTarget(self, action: #selector(self.textFieldDidChange(textField:)), for: UIControlEvents.editingChanged) 

    } 

第2步：现在我们将处理移到下一个文本字段，删除文本字段。

@objc func textFieldDidChange(textField: UITextField){ 
     let text = textField.text 
     if text?.count == 1 { 
      switch textField{ 
      case otpTextField1: 
       otpTextField2.becomeFirstResponder() 
      case otpTextField2: 
       otpTextField3.becomeFirstResponder() 
      case otpTextField3: 
       otpTextField4.becomeFirstResponder() 
      case otpTextField4: 
       otpTextField4.resignFirstResponder() 
      default: 
       break 
      } 
     } 
     if text?.count == 0 { 
      switch textField{ 
      case otpTextField1: 
       otpTextField1.becomeFirstResponder() 
      case otpTextField2: 
       otpTextField1.becomeFirstResponder() 
      case otpTextField3: 
       otpTextField2.becomeFirstResponder() 
      case otpTextField4: 
       otpTextField3.becomeFirstResponder() 
      default: 
       break 
      } 
     } 
     else{ 

     } 
    } 

重要提示：不要忘记设置代理。