Formatting a UITextField for credit card input like (xxxx xxxx xxxx xxxx)

Question

I want to format a UITextField for entering a credit card number into such that it only allows digits to be entered and automatically inserts spaces so that the

Answer 1

Please use simple form of credite card /** See sample usage: ### let str = "41111111111111111"

 let x = yourClassname.setStringAsCardNumberWithSartNumber(4, withString: str!, withStrLenght: 8)

 ### output:- 4111XXXXXXXX1111

 let x = yourClassname.setStringAsCardNumberWithSartNumber(0, withString: str!, withStrLenght: 12)

 ### output: - XXXXXXXXXXXX1111

 */
func setStringAsCardNumberWithSartNumber(Number:Int,withString str:String ,withStrLenght len:Int ) -> String{
    //let aString: String = "41111111111111111"
    let arr = str.characters
    var CrediteCard : String = ""
    if arr.count > (Number + len) {
        for (index, element ) in arr.enumerate(){
            if index >= Number && index < (Number + len) {
                CrediteCard = CrediteCard + String("X")
            }else{
                CrediteCard = CrediteCard + String(element)
            }
        }
      return CrediteCard
    }else{
            print("\(Number) plus \(len) are grether than strings chatarter \(arr.count)")
    }
    print("\(CrediteCard)")
    return str
}

I hope this is helpful to you.