let mainString = “Hello World” let stringToColor = “World” SWIFT 5 let range = (mainString as NSString).range(of: stringToColor) let mutableAttributedString = NSMutableAttributedString.init(string: mainString) mutableAttributedString.addAttribute(NSAttributedString.Key.foregroundColor, value: UIColor.red, range: range) textField = UITextField.init(frame: CGRect(x:10, y:20, width:100, height: 100)) textField.attributedText = mutableAttributedString SWIFT 4.2 let range = (mainString as NSString).range(of: stringToColor) let mutableAttributedString = NSMutableAttributedString.init(string: mainString) mutableAttributedString.addAttribute(NSAttributedStringKey.foregroundColor, value: … Read more