制作类似于锁定屏幕的登录屏幕

Question

我试图制作类似于具有4个textField的锁定屏幕的登录屏幕。 我面临的问题是将焦点从一个文本字段更改为下一个。

• 当我说secondTextField.becomeFirstResponder()的firstTextField的值被复制到secondTextField
• 我使用的是十进制垫 - 键盘类型

这是我到目前为止，我做无法找到解决办法来解决这个问题：

• 使用UITextFieldDelegate
• IBOutlet中取得连接对所有文本字段
• firstText.delegate = self secondText.delegate = self thirdText.delegate = self firstText.becomeFirstResponder()

• FUNC文本字段（文本框：的UITextField，shouldChangeCharactersInRange范围：NSRange，replacementString字符串：字符串） - >布尔{ 变种newLength = countElements（的TextField.text）+ countElements（字符串） - 范围。长度

  if newLength == 1 { 
       if textField == firstText{ 
        changeFocus(textField) 
       }else if textField == secondText { 
        changeFocus(textField) 
       }else if textField == thirdText { 
        changeFocus(textField) 
       } 
  
      } 
  return newLength <= 1 
  

  }

  FUNC changeFocus（的nextfocus：的UITextField）{

  if nextFocus == firstText { 
      firstText.resignFirstResponder() 
      secondText.becomeFirstResponder() 
  } else if nextFocus == secondText { 
      secondText.resignFirstResponder() 
      thirdText.becomeFirstResponder() 
  } else if nextFocus == thirdText { 
      thirdText.resignFirstResponder() 
  } 
  

  }

我怎样才能做到这一点正确，任何帮助和建议，请。

Answer 1

我发现类似的东西在这里：similar

得到它的工作，有两个限制：

• 首先，我不能向后删除
• 其次，用户必须点击第一个文本框如果passCode错误。 但现在这些已经够好了。

• 这里是方法

  func textField(textField: UITextField, shouldChangeCharactersInRange range: NSRange, replacementString string: String) -> Bool { 
  
  var shouldProcess = false 
  var moveToNextTextField = false 
  var insertStringLength = countElements(string) 
  if insertStringLength == 0 { 
      shouldProcess = true 
  } 
  else { 
      if countElements(textField.text) == 0 { 
       shouldProcess = true 
      } 
  } 
  if shouldProcess { 
      var myString = textField.text 
      if countElements(myString) == 0{ 
       myString = myString + string 
  
       password = password + myString 
       moveToNextTextField = true 
      } 
      textField.text = myString 
  
      if moveToNextTextField { 
       changeFocus(textField) 
      } 
  } 
  return false 
  } 
  

• 方法来改变焦点：

  func changeFocus(nextTextField : UITextField){ 
  if nextTextField == firstText { 
      firstText.resignFirstResponder() 
      secondText.becomeFirstResponder() 
  } else if nextTextField == secondText { 
      secondText.resignFirstResponder() 
      thirdText.becomeFirstResponder() 
  } else if nextTextField == thirdText { 
      thirdText.resignFirstResponder() 
      fourthText.becomeFirstResponder() 
  } else if nextTextField == fourthText { 
      fourthText.resignFirstResponder() 
  } 
  

  }

• 方法来检查管脚/密码：

  func textFieldShouldEndEditing(textField: UITextField) -> Bool { 
  if textField == fourthText { 
      thirdText.resignFirstResponder() 
      let pass = defaultUser.stringForKey(Admin) 
      println("password = \(password)") 
      if pass == password { 
  
       println("the password is correct") 
       dispatch_async(dispatch_get_main_queue()) {() -> Void in 
        self.performSegueWithIdentifier("SegueToSecond", sender: self) 
       } 
  
      } else { 
       println("wrong password") 
       thirdText.text = "" 
       secondText.text = "" 
       firstText.text = "" 
       fourthText.text = "" 
       password = "" 
       view.reloadInputViews() 
      } 
  
  } 
  
  return true 
  } 
  

希望这些帮助稍后一些。

Answer 2

使用该委托方法来改变焦点

func textFieldShouldReturn(textField: UITextField) -> Bool 

Answer 3

要添加更多一点svrushal答案：

func textFieldShouldReturn(textField: UITextField) -> Bool { 
    if textField == firstText { 
     secondText.becomeFirstResponder() 
    } 

    if textField == secondText { 
     thirdText.becomeFirstResponder() 
    } 

    if textField == thirdText { 
     fourthText.becomeFirstResponder() 
    } 

} 

Answer 4

你可以参考这个链接https://github.com/dhennessy/PAPasscode/blob/master/PAPasscode/PAPasscodeViewController.h

它会帮助你出去。