How to change colour of all numbers in a string in swift

Question

I am trying to change colour for all numbers present in a string in swift code.Example:

var mystring = \"abc 3423 opqrs 474598 lmno 343543\"
         


        

Answer 1

Here's an extension using Swift 5 using Zig's answer as reference:

  extension String {

    func changeColorForNumbers() -> NSMutableAttributedString {
        let red = [NSAttributedString.Key.foregroundColor: UIColor.red]

        let myAttributedString = NSMutableAttributedString()
        for letter in self.unicodeScalars {
            let myLetter : NSAttributedString
            if CharacterSet.decimalDigits.contains(letter) {
                myLetter = NSAttributedString(string: "\(letter)", attributes: orange)
            } else {
                myLetter = NSAttributedString(string: "\(letter)")
            }
            myAttributedString.append(myLetter)
        }

        return myAttributedString
    }

}