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

I did something like this for a project, So basically this check whether it's a number and save it's location then by using NSAttributedString, we can easily change the character color like this :-

class ViewController: UIViewController {

@IBOutlet weak var mylabel: UILabel!
let numbers = ["0","1","2","3","4","5","6","7","8","9"]
var mystring = "abc 3423 opqrs 474598 lmno 343543"

override func viewDidLoad() {
    super.viewDidLoad()
    let myAttributedString = NSMutableAttributedString(string: "\(self.mystring)")
    var locations: [Int] = []
    let characters = mystring.characters
    var i = 0
    for letter in characters {
        i = i + 1
        letter.debugDescription
        if numbers.contains(String(letter)) {
            locations.append(i)
        }
    }

    for item in locations {
        print(item)
        let myRange = NSRange(location: item - 1, length: 1)
        myAttributedString.addAttribute(NSForegroundColorAttributeName, value: UIColor.redColor(), range: myRange)
    }
    self.mylabel.attributedText = myAttributedString
    // Do any additional setup after loading the view, typically from a nib.
}

override func didReceiveMemoryWarning() {
    super.didReceiveMemoryWarning()
    // Dispose of any resources that can be recreated.
}

}

Here is a screenShot