Change string color with NSAttributedString

Question

I have a slider for a survey that display the following strings based on the value of the slider   Very Bad  Bad  Okay  Good  Very Good      Here is the code for the slider   -  IBAction  sliderValueChanged  UISlider   sender       scanLabel text    NSString stringWithFormat      f    sender value        NSArray  texts  NSArray arrayWithObjects   Very Bad     Bad     Okay     Good     Very Good     Very Good   nil       NSInteger sliderValue  sender value     make the slider value in given range integer one      self scanLabel text  texts objectAtIndex sliderValue       I want  Very Bad  to be red   Bad  to be orange   Okay  to be yellow   Good  and  Very Good  to be green     I don t understand how to use NSAttributedString to get this done

User · Answer

For Swift 5   var attributes    NSAttributedString Key  AnyObject    attributes  foregroundColor    UIColor red  let attributedString   NSAttributedString string   Very Bad   attributes  attributes   label attributedText   attributedString   For Swift 4   var attributes    NSAttributedStringKey  AnyObject    attributes  foregroundColor    UIColor red  let attributedString   NSAttributedString string   Very Bad   attributes  attributes   label attributedText   attributedString   For Swift 3   var attributes    String  AnyObject    attributes NSForegroundColorAttributeName    UIColor red  let attributedString   NSAttributedString string   Very Bad   attributes  attributes   label attributedText   attributedString

User · Answer

Update for Swift 4 2  var attributes    NSAttributedString Key  AnyObject     attributes  foregroundColor    UIColor blue  let attributedString   NSAttributedString string   Very Bad   attributes  attributes   label attributedText   attributedString

User · Answer

With Swift 4  NSAttributedStringKey has a static property called foregroundColor  foregroundColor has the following declaration   static let foregroundColor  NSAttributedStringKey      The value of this attribute is a UIColor object  Use this attribute to specify the color of the text during rendering  If you do not specify this attribute  the text is rendered in black    The following Playground code shows how to set the text color of an NSAttributedString instance with foregroundColor   import UIKit  let string    Some text  let attributes    NSAttributedStringKey foregroundColor   UIColor red  let attributedString   NSAttributedString string  string  attributes  attributes      The code below shows a possible UIViewController implementation that relies on NSAttributedString in order to update the text and text color of a UILabel from a UISlider   import UIKit  enum Status  Int       case veryBad   0  bad  okay  good  veryGood      var display   text  String  color  UIColor            switch self           case  veryBad   return   Very bad    red          case  bad       return   Bad    orange          case  okay      return   Okay    yellow          case  good      return   Good    green          case  veryGood  return   Very good    blue                       static let minimumValue   Status veryBad rawValue     static let maximumValue   Status veryGood rawValue       final class ViewController  UIViewController         IBOutlet weak var label  UILabel       IBOutlet weak var slider  UISlider      var currentStatus  Status   Status veryBad           didSet                  currentStatus is our model  Observe its changes to update our display             updateDisplay                        override func viewDidLoad             super viewDidLoad               Prepare slider         slider minimumValue   Float Status minimumValue          slider maximumValue   Float Status maximumValue              Set display         updateDisplay              func updateDisplay             let attributes    NSAttributedStringKey foregroundColor   currentStatus display color          let attributedString   NSAttributedString string  currentStatus display text  attributes  attributes          label attributedText   attributedString         slider value   Float currentStatus rawValue              IBAction func updateCurrentStatus   sender  UISlider            let value   Int sender value rounded            guard let status   Status rawValue  value  else   fatalError  Could not get Status object from value             currentStatus   status            Note however that you don t really need to use NSAttributedString for such an example and can simply rely on UILabel s text and textColor properties  Therefore  you can replace your updateDisplay   implementation with the following code   func updateDisplay         label text   currentStatus display text     label textColor   currentStatus display color     slider value   Float currentStatus rawValue

User · Answer

In Swift 4      Custom color let greenColor   UIColor red  10 255  green  190 255  blue  50 255  alpha  1     create the attributed colour let attributedStringColor    NSAttributedStringKey foregroundColor   greenColor      create the attributed string let attributedString   NSAttributedString string   Hello World    attributes  attributedStringColor     Set the label label attributedText   attributedString   In Swift 3       Custom color let greenColor   UIColor red  10 255  green  190 255  blue  50 255  alpha  1     create the attributed color let attributedStringColor   NSDictionary    NSForegroundColorAttributeName   greenColor      create the attributed string let attributedString   NSAttributedString string   Hello World    attributes  attributedStringColor as   String   AnyObject      Set the label label attributedText   attributedString    Enjoy

User · Answer

There is no need for using NSAttributedString  All you need is a simple label with the proper textColor  Plus this simple solution will work with all versions of iOS  not just iOS 6    But if you needlessly wish to use NSAttributedString  you can do something like this   UIColor  color    UIColor redColor      select needed color NSString  string          the string to colorize NSDictionary  attrs      NSForegroundColorAttributeName   color    NSAttributedString  attrStr     NSAttributedString alloc  initWithString string attributes attrs   self scanLabel attributedText   attrStr

User · Answer

You can create NSAttributedString NSDictionary  attributes      NSForegroundColorAttributeName    UIColor redColor     NSAttributedString  attrStr     NSAttributedString alloc  initWithString   quot My Color String quot  attributes attrs    OR NSMutableAttributedString to apply custom attributes with Ranges  NSMutableAttributedString  attributedString     NSMutableAttributedString alloc  initWithString  NSString stringWithFormat   quot      quot   methodPrefix  method  attributes     NSFontAttributeName   FONT MYRIADPRO 48       attributedString addAttribute NSFontAttributeName value FONT MYRIADPRO SEMIBOLD 48  range NSMakeRange methodPrefix length  method length     Available Attributes  NSAttributedStringKey  UPDATE  Swift 5 1 let message  String   greeting   someMessage let paragraphStyle   NSMutableParagraphStyle   paragraphStyle lineSpacing   2 0         Note  UIFont appFontFamily ofSize   is extended init  let regularAttributes   NSAttributedString Key   Any      font   UIFont appFontFamily   regular  ofSize  15     paragraphStyle   paragraphStyle  let boldAttributes    NSAttributedString Key font   UIFont appFontFamily   semiBold  ofSize  15     let mutableString   NSMutableAttributedString string  message  attributes  regularAttributes  mutableString addAttributes boldAttributes  range  NSMakeRange 0  greeting count

User · Answer

Use something like this  Not compiler checked   NSMutableAttributedString  string     NSMutableAttributedString alloc initWithString self text text   NSRange range  self myLabel text rangeOfString texts sliderValue      myLabel is the outlet from where you will get the text  it can be same or different  NSArray  colors    UIColor redColor                      UIColor redColor                      UIColor yellowColor                      UIColor greenColor                        string addAttribute NSForegroundColorAttributeName                 value colors sliderValue                  range range                self scanLabel setAttributedText texts sliderValue

User · Answer

One liner for Swift   NSAttributedString string   Red Text   attributes    foregroundColor  UIColor red

[ios] Change string color with NSAttributedString?

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