快速将 UITextField 设置为 mm-dd-yy 格式

Question

所以我想让UITextField 只接受数字，通过使用自定义键盘输入解决了这个问题。

UITextField 的目的是为某人过生日。我不想使用UIDatePicker，因为我不喜欢它的外观。

我希望TextField 在用户输入TextField 的每个第二个数字后自动插入破折号。

dd-mm-yy 是占位符文本。我要么想永久制作破折号，但我也不知道该怎么做。

我该怎么做？

Answer 1

您希望允许用户在此 dd-mm-yy 的文本字段中输入文本，对吗？ 如果是这样，我相信这会对你有所帮助。

1. 在你的类的顶部声明这个我们稍后会使用的变量。

   var dateFormate = Bool()
   

2. 为该文本字段添加委托和标记。

3. 然后添加以下委托方法

   func textField(textField: UITextField, shouldChangeCharactersInRange range: NSRange, replacementString string: String) -> Bool {
   
   //1. To make sure that this is applicable to only particular textfield add tag.
   if textField.tag == 1 {
       //2. this one helps to make sure that user enters only numeric characters and '-' in fields
       let numbersOnly = NSCharacterSet(charactersInString: "1234567890-")
       let characterSetFromTextField = NSCharacterSet(charactersInString: string)
   
       let Validate:Bool = numbersOnly .isSupersetOfSet(characterSetFromTextField)
       if !Validate {
           return false;
       }
       if range.length + range.location > textField.text?.characters.count {
           return false
       }
       let newLength = (textField.text?.characters.count)! + string.characters.count - range.length
       if newLength == 3 || newLength == 6 {
           let  char = string.cStringUsingEncoding(NSUTF8StringEncoding)!
           let isBackSpace = strcmp(char, "\\b")
   
           if (isBackSpace == -92) {
               dateFormate = false;
           }else{
               dateFormate = true;
           }
   
           if dateFormate {
               let textContent:String!
               textContent = textField.text
               //3.Here we add '-' on overself.
               let textWithHifen:NSString = "\(textContent)-"
               textField.text = textWithHifen as String
               dateFormate = false
           }
       }
       //4. this one helps to make sure only 8 character is added in textfield .(ie: dd-mm-yy)
       return newLength <= 8;
   
   }
   return true
   }
   

4. 现在用户可以输入他们的出生日期了。不用担心会自动添加“-”。

斯威夫特 3：

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

    //1. To make sure that this is applicable to only particular textfield add tag.
    if textField.tag == 1 {
        //2. this one helps to make sure that user enters only numeric characters and '-' in fields
        let numbersOnly = CharacterSet(charactersIn: "1234567890-")

        let Validate = string.rangeOfCharacter(from: numbersOnly.inverted) == nil ? true : false
        if !Validate {
            return false;
        }
        if range.length + range.location > textField.text?.characters.count {
            return false
        }
        let newLength = (textField.text?.characters.count)! + string.characters.count - range.length
        if newLength == 3 || newLength == 6 {
            let  char = string.cString(using: NSUTF8StringEncoding)!
            let isBackSpace = strcmp(char, "\\b")

            if (isBackSpace == -92) {
                dateFormate = false;
            }else{
                dateFormate = true;
            }

            if dateFormate {
                let textContent:String!
                textContent = textField.text
                //3.Here we add '-' on overself.
                let textWithHifen:NSString = "\(textContent)-"
                textField.text = textWithHifen as String
                dateFormate = false
            }
        }
        //4. this one helps to make sure only 8 character is added in textfield .(ie: dd-mm-yy)
        return newLength <= 8;

    }
    return true
}

Answer 2

Swift5 // 使用文本域委托shouldChangeCharactersIn

 func textField(_ textField: UITextField, shouldChangeCharactersIn range: NSRange, replacementString string: String) -> Bool {
      if (textField.text?.count == 2) || (textField.text?.count == 5) {
           if !(string == "") {
                textField.text = (textField.text)! + "-"
               }
            }
       return !(textField.text!.count > 7 && (string.count ) > range.length)
    }