Question

所以我希望UITextField只接受数字，通过使用自定义键盘输入解决这个问题。

这个UITextField的目的是让某人生日快乐。我不想使用UIDatePicker强硬，因为我不喜欢它的样子。

我希望TextField会在用户输入TextField后的每两位数后自动插入破折号。

dd-mm-yy是占位符文字。我要么想要永久破折号，要么我也不知道怎么做。

我该怎么做？

Answer 1

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

在你的班级顶部声明我们稍后会使用的这个变量。
```
var dateFormate = Bool()
```
为该文字字段添加委托和代码。

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
}

现在用户可以输入他们的DOB.No需要担心＆＃39; - ＆＃39;它会自动添加。

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
}

在swift中将UITextField设置为mm-dd-yy格式

1 个答案: