Changing specific text s color using NSMutableAttributedString in Swift

Question

The issue I am having is that I want to be able to change the textColor of certain text in a TextView  I am using a concatenated string  and just want the strings I am appending into the TextView s text  It appears that what I want to use is NSMutableAttributedString  but I am not finding any resources of how to use this in Swift  What I have so far is something like this   let string    A   stringOne  with   stringTwo   var attributedString   NSMutableAttributedString string  string  textView attributedText   attributedString   From here I know I need to find the range of words that need to have their textColor changed and then add them to the attributed string  What I need to know is how to find the correct strings from the attributedString  and then change their textColor   Since I have too low of a rating I can t answer my own question  but here is the answer I found  I found my own answer by translating from translating some code from   Change attributes of substrings in a NSAttributedString  Here is the example of implementation in Swift   let string    A   stringOne  and   stringTwo   var attributedString   NSMutableAttributedString string string   let stringOneRegex   NSRegularExpression pattern  nameString  options  nil  error  nil  let stringOneMatches   stringOneRegex matchesInString longString  options  nil  range  NSMakeRange 0  attributedString length   for stringOneMatch in stringOneMatches       let wordRange   stringOneMatch rangeAtIndex 0      attributedString addAttribute NSForegroundColorAttributeName  value  UIColor nameColor    range  wordRange     textView attributedText   attributedString   Since I am wanting to change the textColor of multiple Strings I will make a helper function to handle this  but this works for changing the textColor

User · Answer

To change color of the font colour  first select attributed instead of plain like in the image below  You then need to select the text in the attributed field and then select the color button on the right-hand side of the alignments  This will change the color

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Based on the answers before I created a string extension  extension String    func highlightWordsIn highlightedWords  String  attributes    NSAttributedStringKey  Any    - gt  NSMutableAttributedString        let range    self as NSString  range of  highlightedWords       let result   NSMutableAttributedString string  self        for attribute in attributes            result addAttributes attribute  range  range               return result           You can pass the attributes for the text to the method  Call like this    let attributes     NSAttributedStringKey foregroundColor UIColor red    NSAttributedStringKey font  UIFont boldSystemFont ofSize  17      myLabel attributedText    This is a text  highlightWordsIn highlightedWords   is a text   attributes  attributes

User · Answer

I see you have answered the question somewhat  but to provide a slightly more concise way without using regex to answer to the title question   To change the colour of a length of text you need to know the start and end index of the coloured-to-be characters in the string e g   var main string    Hello World  var string to color    World   var range    main string as NSString  rangeOfString string to color    Then you convert to attributed string and use  add attribute  with NSForegroundColorAttributeName   var attributedString   NSMutableAttributedString string main string  attributedString addAttribute NSForegroundColorAttributeName  value  UIColor redColor     range  range    A list of further standard attributes you can set can be found in Apple s documentation

User · Answer

Swift 4 1  I have changed from this In Swift 3  let str    Welcome   let welcomeAttribute     NSForegroundColorAttributeName  UIColor blue    let welcomeAttrString   NSMutableAttributedString string  str  attributes  welcomeAttribute    And this in Swift 4 0  let str    Welcome   let welcomeAttribute     NSAttributedStringKey foregroundColor  UIColor blue    let welcomeAttrString   NSMutableAttributedString string  str  attributes  welcomeAttribute    to Swift 4 1  let str    Welcome   let welcomeAttribute     NSAttributedStringKey rawValue  NSForegroundColorAttributeName   UIColor blue    let welcomeAttrString   NSMutableAttributedString string  str  attributes  welcomeAttribute    Works fine

User · Answer

You can use as simple extension extension String   func attributedString subStr  String  - gt  NSMutableAttributedString      let range    self as NSString  range of  subStr      let attributedString   NSMutableAttributedString string self      attributedString addAttribute NSAttributedString Key foregroundColor  value  UIColor red   range  range           return attributedString        myLable attributedText   fullStr attributedString subStr  strToChange

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For everyone who are looking for  Applying specific color to multiple words in text   we can do it using NSRegularExpression   func highlight matchingText  String  in text  String        let attributedString    NSMutableAttributedString string  text      if let regularExpression   try  NSRegularExpression pattern     matchingText    options   caseInsensitive            let matchedResults   regularExpression matches in  text  options      range  NSRange location  0  length  attributedString length           for matched in matchedResults                attributedString addAttributes  NSAttributedStringKey backgroundColor   UIColor yellow   range  matched range                     yourLabel attributedText   attributedString           Reference link   https   gist github com aquajach 4d9398b95a748fd37e88

User · Answer

You can use this extension I test it over swift 4 2 import Foundation import UIKit  extension NSMutableAttributedString        convenience init  fullString  String  fullStringColor  UIColor  subString  String  subStringColor  UIColor               let rangeOfSubString    fullString as NSString  range of  subString             let rangeOfFullString   NSRange location  0  length  fullString count   fullString range of  fullString             let attributedString   NSMutableAttributedString string fullString             attributedString addAttribute NSAttributedStringKey foregroundColor  value  fullStringColor  range  rangeOfFullString             attributedString addAttribute NSAttributedStringKey foregroundColor  value  subStringColor  range  rangeOfSubString              self init attributedString  attributedString

User · Answer

This might be work for you   let main string     User not found Want to review   Click here      let string to color    Click here       let range    main string as NSString  range of  string to color       let attribute   NSMutableAttributedString init string  main string      attribute addAttribute NSAttributedStringKey foregroundColor  value  UIColor blue   range  range       lblClickHere attributedText   attribute

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Swift 4 2 and Swift 5 colorise parts of the string   A very easy way to use NSMutableAttributedString while extending the String  This also can be used to colourize more than one word in the whole string   Add new file for extensions  File -  New -  Swift File with name for ex   NSAttributedString TextColouring  and add the code  import UIKit  extension String       func attributedStringWithColor   strings   String   color  UIColor  characterSpacing  UInt    nil  - gt  NSAttributedString           let attributedString   NSMutableAttributedString string  self          for string in strings               let range    self as NSString  range of  string              attributedString addAttribute NSAttributedString Key foregroundColor  value  color  range  range                     guard let characterSpacing   characterSpacing else  return attributedString           attributedString addAttribute NSAttributedString Key kern  value  characterSpacing  range  NSRange location  0  length  attributedString length            return attributedString           Now you can use globally at any viewcontroller you want   let attributedWithTextColor  NSAttributedString    Doc  welcome back     attributedStringWithColor   Doc    back    color  UIColor black   myLabel attributedText   attributedWithTextColor

User · Answer

Easiest way to do label with different style such as color  font etc  is use property  Attributed  in Attributes Inspector  Just choose part of text and change it like you want

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With this simple function you can assign the text and highlight the chosen word   You can also change the UITextView to UILabel  etc   func highlightBoldWordAtLabel textViewTotransform  UITextView  completeText  String  wordToBold  String       textViewToTransform text   completeText     let range    completeText as NSString  range of  wordToBold      let attribute   NSMutableAttributedString init string  completeText       attribute addAttribute NSAttributedString Key font  value  UIFont boldSystemFont ofSize  16   range  range      attribute addAttribute NSAttributedString Key foregroundColor  value  UIColor black   range  range      textViewToTransform attributedText   attribute

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Please check cocoapod Prestyler   Prestyler defineRule      UIColor orange  label attributedText    This  text  is orange  prestyled

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Answer is already given in previous posts but i have a different way of doing this  Swift 3x    var myMutableString   NSMutableAttributedString    myMutableString   NSMutableAttributedString string   Your full label textString    myMutableString setAttributes  NSFontAttributeName   UIFont name   HelveticaNeue-Light   size  CGFloat 17 0              NSForegroundColorAttributeName   UIColor red  232   255 0  green  117   255 0  blue  40   255 0  alpha  1 0    range  NSRange location 12 length 8      What ever range you want to give  yourLabel attributedText   myMutableString   Hope this helps anybody

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let mainString    quot Hello World quot  let stringToColor    quot World quot   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  UIColor red  range  range            textField   UITextField init frame  CGRect x 10  y 20  width 100  height  100   textField attributedText   mutableAttributedString

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This extension works well when configuring the text of a label with an already set default color  public extension String       func setColor   color  UIColor  ofSubstring substring  String  - gt  NSMutableAttributedString           let range    self as NSString  range of  substring          let attributedString   NSMutableAttributedString string  self          attributedString addAttribute NSAttributedString Key foregroundColor  value  color  range  range          return attributedString          For example let text    quot Hello World  quot  let attributedText   text setColor  blue  ofSubstring   quot World quot    let myLabel   UILabel   myLabel textColor    white myLabel attributedText   attributedText

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Swift 4 1  NSAttributedStringKey foregroundColor   for example if you want to change font in NavBar   self navigationController  navigationBar titleTextAttributes     NSAttributedStringKey font  UIFont systemFont ofSize  22   NSAttributedStringKey foregroundColor  UIColor white

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extension String     to make text field mandatory   looks mutating func markAsMandatoryField  - gt  NSAttributedString       let main string   self     let string to color           let range    main string as NSString  range of  string to color      print  The rang     range        let attribute   NSMutableAttributedString init string  main string      attribute addAttribute NSAttributedString Key foregroundColor  value  UIColor rgbColor red  255 0  green  0 0  blue  23 0    range  range       return attribute           use   EmailLbl attributedText   EmailLbl text  markAsMandatoryField

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Super easy way to do this   let text    This is a colorful attributed string  let attributedText    NSMutableAttributedString getAttributedString fromString  text  attributedText apply color   red  subString   This     Apply yellow color on range attributedText apply color   yellow  onRange  NSMakeRange 5  4     For more detail click here  https   github com iOSTechHub AttributedString

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swift 4 2      let textString    Hello world      let range    textString as NSString  range of   world       let attributedString   NSMutableAttributedString string  textString       attributedString addAttribute NSAttributedStringKey foregroundColor  value  UIColor red  range  range      self textUIlable attributedText   attributedString

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If you are using Swift 3x and UITextView  maybe the NSForegroundColorAttributeName won t work  it didn t work for me no matter what approach I tried    So  after some digging around I found a solution     Get the textView somehow let textView   UITextView     Set the attributed string with links to it textView attributedString   attributedString   Set the tint color  It will apply to the link only textView tintColor   UIColor red

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You need to change textview parameters  not parameters of attributed string  textView linkTextAttributes             NSAttributedString Key foregroundColor  UIColor red          NSAttributedString Key underlineColor  UIColor red          NSAttributedString Key underlineStyle  NSUnderlineStyle single rawValue

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You can use this method  I implemented this method in my common utility class to access globally    func attributedString with highlightString  String  normalString  String  highlightColor  UIColor  - gt  NSMutableAttributedString       let attributes    NSAttributedString Key foregroundColor  highlightColor      let attributedString   NSMutableAttributedString string  highlightString  attributes  attributes      attributedString append NSAttributedString string  normalString       return attributedString

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Swift 2 2  var myMutableString   NSMutableAttributedString    myMutableString   NSMutableAttributedString string   1234567890   attributes   NSFontAttributeName UIFont name  kDefaultFontName  size  14 0      myMutableString addAttribute NSForegroundColorAttributeName  value  UIColor red  0 0 255 0  green  125 0 255 0  blue  179 0 255 0  alpha  1 0   range  NSRange location 0 length 5    self lblPhone attributedText   myMutableString

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Swift 2 1 Update    let text    We tried to make this app as most intuitive as possible for you  If you have any questions don t hesitate to ask us  For a detailed manual just click here    let linkTextWithColor    click here    let range    text as NSString  rangeOfString linkTextWithColor    let attributedString   NSMutableAttributedString string text   attributedString addAttribute NSForegroundColorAttributeName  value  UIColor redColor     range  range    self helpText attributedText   attributedString   self helpText is a UILabel outlet

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Chris  answer was a great help to me  so I used his approach and turned into a func that I can reuse   This let s me assign a color to a substring while giving the rest of the string another color   static func createAttributedString fullString  String  fullStringColor  UIColor  subString  String  subStringColor  UIColor  - gt  NSMutableAttributedString       let range    fullString as NSString  rangeOfString subString      let attributedString   NSMutableAttributedString string fullString      attributedString addAttribute NSForegroundColorAttributeName  value  fullStringColor  range  NSRange location  0  length  fullString characters count       attributedString addAttribute NSForegroundColorAttributeName  value  subStringColor  range  range      return attributedString

[ios] Changing specific text's color using NSMutableAttributedString in Swift

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