Making text bold using attributed string in swift

Question

I have a string like this  var str     text1 this is good  text1    Now replace text1 with another string  say t 1  I am able to replace the text  but i am not able to bold it  I want to bold the new string t 1  so that the final output will be    t 1 this is good  t 1  How can I do it    All the examples I am seeing are in Objective-C  but I want to do it in Swift   Thanks in advance

User · Answer

Just use code something like this     let font   UIFont name   Your-Font-Name   size  10 0            let attributedText   NSMutableAttributedString attributedString  noteLabel attributedText           let boldedRange   NSRange attributedText string range of   Note      in  attributedText string          attributedText addAttributes  NSAttributedString Key font   font   range  boldedRange          noteLabel attributedText   attributedText

User · Answer

For -  Search Television by size  1-way using NString and its Range  let query    Television  let headerTitle    size  let message    Search   query  by   headerTitle   let range    message as NSString  range of  query  let attributedString   NSMutableAttributedString string  message  attributedString addAttribute NSAttributedString Key font  value  UIFont boldSystemFont ofSize  label1 font pointSize   range  range  label1 attributedText   attributedString   another without using NString and its Range  let query    Television  let headerTitle    size  let  searchText  byText      Search      by   headerTitle    let attributedString   NSMutableAttributedString string  searchText  let byTextAttributedString   NSMutableAttributedString string  byText  let attrs    NSAttributedString Key font   UIFont boldSystemFont ofSize  label1 font pointSize   let boldString   NSMutableAttributedString string  query  attributes attrs  attributedString append boldString  attributedString append byTextAttributedString  label1 attributedText   attributedString   swift5

User · Answer

Accepting as valid the response of Prajeet Shrestha in this thread  I would like to extend his solution using the Label if it is known and the traits of the font   Swift 4  extension NSMutableAttributedString         discardableResult func normal   text  String  - gt  NSMutableAttributedString           let normal   NSAttributedString string  text          append normal           return self             discardableResult func bold   text  String  withLabel label  UILabel  - gt  NSMutableAttributedString              generate the bold font         var font  UIFont   UIFont name  label font fontName   size  label font pointSize           font   UIFont descriptor  font fontDescriptor withSymbolicTraits  traitBold     font fontDescriptor  size  font pointSize             generate attributes         let attrs   NSAttributedStringKey  Any     NSAttributedStringKey font  font          let boldString   NSMutableAttributedString string text  attributes  attrs             append the attributed text         append boldString           return self

User · Answer

edit update  Xcode 8 3 2     Swift 3 1  If you know HTML and CSS you can use it to easily control the font style  color and size of your attributed string as follow   extension String       var html2AttStr  NSAttributedString            return try  NSAttributedString data  Data utf8   options   NSDocumentTypeDocumentAttribute  NSHTMLTextDocumentType  NSCharacterEncodingDocumentAttribute  String Encoding utf8 rawValue   documentAttributes  nil             lt style type   text css   gt  red color  F00  green color  0F0  blue color   00F  font-weight  Bold  font-size  32  lt  style gt  lt span id   red    gt Red  lt  span gt  lt span id   green    gt  Green  lt  span gt  lt span id   blue   gt and Blue lt  span gt   html2AttStr

User · Answer

Building on Jeremy Bader and David West s excellent answers  a Swift 3 extension   extension String       func withBoldText boldPartsOfString  Array lt NSString gt   font  UIFont   boldFont  UIFont   - gt  NSAttributedString           let nonBoldFontAttribute    NSFontAttributeName font           let boldFontAttribute    NSFontAttributeName boldFont           let boldString   NSMutableAttributedString string  self as String  attributes nonBoldFontAttribute          for i in 0    lt  boldPartsOfString count               boldString addAttributes boldFontAttribute  range   self as NSString  range of  boldPartsOfString i  as String                     return boldString           Usage   let label   UILabel   let font   UIFont name   AvenirNext-Italic   size  24   let boldFont   UIFont name   AvenirNext-BoldItalic   size  24   label attributedText    Make sure your face is nbrightly and evenly lit  withBoldText      boldPartsOfString    brightly    evenly    font  font  boldFont  boldFont

User · Answer

Swift 4 and higher For Swift 4 and higher that is a good way      let attributsBold    NSAttributedString Key font   UIFont systemFont ofSize  16  weight   bold       let attributsNormal    NSAttributedString Key font   UIFont systemFont ofSize  16  weight   regular       var attributedString   NSMutableAttributedString string   quot Hi  quot   attributes attributsNormal      let boldStringPart   NSMutableAttributedString string   quot John quot   attributes attributsBold      attributedString append boldStringPart         yourLabel attributedText   attributedString  In the Label the Text looks like   quot Hi John quot

User · Answer

Improving upon Prajeet Shrestha answer   -   You can make a generic extension for NSMutableAttributedString which involves less code  In this case I have chosen to use system font but you could adapt it so you can input the font name as a parameter       extension NSMutableAttributedString            func systemFontWith text  String  size  CGFloat  weight  CGFloat  - gt  NSMutableAttributedString               let attributes   String  AnyObject     NSFontAttributeName  UIFont systemFont ofSize  size  weight  weight               let string   NSMutableAttributedString string  text  attributes  attributes              self append string              return self

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two liner in swift 4                button setAttributedTitle  init string   My text   attributes    font  UIFont systemFont ofSize  20  weight   bold     for   selected              button setAttributedTitle  init string   My text   attributes    font  UIFont systemFont ofSize  20  weight   regular     for   normal

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I extended David West s great answer so that you can input a string and tell it all the substrings you would like to embolden   func addBoldText fullString  NSString  boldPartsOfString  Array lt NSString gt   font  UIFont   boldFont  UIFont   - gt  NSAttributedString       let nonBoldFontAttribute    NSFontAttributeName font       let boldFontAttribute    NSFontAttributeName boldFont       let boldString   NSMutableAttributedString string  fullString as String  attributes nonBoldFontAttribute      for i in 0    lt  boldPartsOfString count           boldString addAttributes boldFontAttribute  range  fullString rangeOfString boldPartsOfString i  as String             return boldString     And then call it like this   let normalFont   UIFont name   Dosis-Medium   size  18  let boldSearchFont   UIFont name   Dosis-Bold   size  18  self UILabel attributedText   addBoldText  Check again in 30 days to find more friends   boldPartsOfString    Check    30 days    find    friends    font  normalFont   boldFont  boldSearchFont     This will embolden all the substrings you want bolded in your given string

User · Answer

var normalText    Hi am normal   var boldText     And I am BOLD    var attributedString   NSMutableAttributedString string normalText   var attrs    NSFontAttributeName   UIFont boldSystemFont ofSize  15   var boldString   NSMutableAttributedString string  boldText  attributes attrs   attributedString append boldString    When you want to assign it to a label   yourLabel attributedText   attributedString

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Usage  let label   UILabel   label attributedText       NSMutableAttributedString            bold  quot Address   quot            normal  quot  Kathmandu  Nepal n n quot            orangeHighlight  quot  Email   quot            blackHighlight  quot  prajeet shrestha gmail com  quot            bold  quot  n nCopyright   quot            underlined  quot  All rights reserved  2020  quot    Result   Here is a neat way to make a combination of bold and normal texts in a single label plus some other bonus methods  Extension  Swift 5   extension NSMutableAttributedString       var fontSize CGFloat   return 14       var boldFont UIFont   return UIFont name   quot AvenirNext-Bold quot   size  fontSize     UIFont boldSystemFont ofSize  fontSize        var normalFont UIFont   return UIFont name   quot AvenirNext-Regular quot   size  fontSize     UIFont systemFont ofSize  fontSize            func bold   value String  - gt  NSMutableAttributedString                    let attributes  NSAttributedString Key   Any                   font   boldFont                            self append NSAttributedString string  value  attributes attributes           return self                func normal   value String  - gt  NSMutableAttributedString                    let attributes  NSAttributedString Key   Any                   font   normalFont                             self append NSAttributedString string  value  attributes attributes           return self              Other styling methods        func orangeHighlight   value String  - gt  NSMutableAttributedString                    let attributes  NSAttributedString Key   Any                   font    normalFont               foregroundColor   UIColor white               backgroundColor   UIColor orange                            self append NSAttributedString string  value  attributes attributes           return self                func blackHighlight   value String  - gt  NSMutableAttributedString                    let attributes  NSAttributedString Key   Any                   font    normalFont               foregroundColor   UIColor white               backgroundColor   UIColor black                                         self append NSAttributedString string  value  attributes attributes           return self                func underlined   value String  - gt  NSMutableAttributedString                    let attributes  NSAttributedString Key   Any                   font    normalFont               underlineStyle   NSUnderlineStyle single rawValue                                         self append NSAttributedString string  value  attributes attributes           return self          Note  If compiler is missing UIFont UIColor  replace them with NSFont NSColor

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This could be useful   class func createAttributedStringFrom  string1   String  strin2   String  attributes1   Dictionary lt String  NSObject gt   attributes2   Dictionary lt String  NSObject gt   - gt  NSAttributedString   let fullStringNormal    string1   strin2  as NSString let attributedFullString   NSMutableAttributedString string  fullStringNormal as String   attributedFullString addAttributes attributes1  range  fullStringNormal rangeOfString string1   attributedFullString addAttributes attributes2  range  fullStringNormal rangeOfString strin2   return attributedFullString

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usage      let attrString   NSMutableAttributedString                appendWith weight   semibold   almost bold                appendWith color   white  weight   bold    white and bold                appendWith color   black  ofSize  18 0    big black     two cents     extension NSMutableAttributedString         discardableResult func appendWith color  UIColor   UIColor darkText  weight  UIFont Weight    regular  ofSize  CGFloat   12 0    text  String  - gt  NSMutableAttributedString          let attrText   NSAttributedString makeWith color  color  weight  weight  ofSize ofSize  text          self append attrText          return self          extension NSAttributedString        public static func makeWith color  UIColor   UIColor darkText  weight  UIFont Weight    regular  ofSize  CGFloat   12 0    text  String  - gt  NSMutableAttributedString            let attrs    NSAttributedStringKey font  UIFont systemFont ofSize  ofSize  weight  weight   NSAttributedStringKey foregroundColor  color          return NSMutableAttributedString string  text  attributes attrs

User · Answer

This is the best way that I have come up with  Add a function you can call from anywhere and add it to a file without a class like Constants swift and then you can embolden words within any string  on numerous occasions by calling just ONE LINE of code   To go in a constants swift file   import Foundation import UIKit  func addBoldText fullString  NSString  boldPartOfString  NSString  font  UIFont   boldFont  UIFont   - gt  NSAttributedString      let nonBoldFontAttribute    NSFontAttributeName font      let boldFontAttribute    NSFontAttributeName boldFont      let boldString   NSMutableAttributedString string  fullString as String  attributes nonBoldFontAttribute     boldString addAttributes boldFontAttribute  range  fullString rangeOfString boldPartOfString as String      return boldString     Then you can just call this one line of code for any UILabel   self UILabel attributedText   addBoldText  Check again in 30 DAYS to find more friends   boldPartOfString   30 DAYS   font  normalFont   boldFont  boldSearchFont       Mark  Albeit that you ve had to define these somewhere   let normalFont   UIFont name   INSERT FONT NAME   size  15  let boldFont   UIFont name   INSERT BOLD FONT   size  15

User · Answer

If you re working with localised strings  you might not be able to rely on the bold string always being at the end of the sentence  If this is the case then the following works well   e g  Query  blah  does not match any items     Create the search query part of the text  e g   blah       The variable  text  is just the value entered by  the user     let searchQuery        text         Put the search text into the message    let message    Query   searchQuery   does not match any items      Find the position of the search string  Cast to NSString as we want    range to be of type NSRange  not Swift s Range lt Index gt     let range    message as NSString  rangeOfString searchQuery      Make the text at the given range bold  Rather than hard-coding a text size     Use the text size configured in Interface Builder     let attributedString   NSMutableAttributedString string  message  attributedString addAttribute NSFontAttributeName  value  UIFont boldSystemFontOfSize label font pointSize   range  range      Put the text in a label    label attributedText   attributedString

User · Answer

You can do this using simple custom method written below  You have give whole string in first parameter and text to be bold in the second parameter  Hope this will help   func getAttributedBoldString str   String  boldTxt   String  - gt  NSMutableAttributedString           let attrStr   NSMutableAttributedString init string  str          let boldedRange   NSRange str range of  boldTxt    in  str          attrStr addAttributes  NSAttributedString Key font   UIFont systemFont ofSize  17  weight   bold    range  boldedRange          return attrStr         usage  initalString   I am a Boy  label attributedText   getAttributedBoldString str   initalString  boldTxt    Boy    resultant string   I am a Boy

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Swift 5 1 use NSAttributedString Key instead of NSAttributedStringKey  let test1Attributes  NSAttributedString Key  Any      font   UIFont name   CircularStd-Book   size  14    let test2Attributes  NSAttributedString Key  Any      font   UIFont name   CircularStd-Bold   size  16     let test1   NSAttributedString string     greeting      attributes test1Attributes  let test2   NSAttributedString string  firstName   attributes test2Attributes  let text   NSMutableAttributedString    text append test1  text append test2  return text

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Swift 3 0  Convert html to string and font change as per your requirement   do         let str   try NSAttributedString data    I m a normal text and  lt b gt this is my bold part    lt  b gt And I m again in the normal text  data using  String Encoding unicode  allowLossyConversion  true     options    NSDocumentTypeDocumentAttribute  NSHTMLTextDocumentType   documentAttributes  nil        myLabel attributedText   str      myLabel font    MONTSERRAT BOLD 23       myLabel textAlignment   NSTextAlignment left   catch        print error        func MONTSERRAT BOLD   size  CGFloat  - gt  UIFont       return UIFont name   MONTSERRAT-BOLD   size  size

User · Answer

Super easy way to do this       let text    This string is having multiple font      let attributedText        NSMutableAttributedString getAttributedString fromString  text       attributedText apply font  UIFont boldSystemFont ofSize  24   subString        This        attributedText apply font  UIFont boldSystemFont ofSize  24   onRange       NSMakeRange 5  6     For more detail click here  https   github com iOSTechHub AttributedString

[ios] Making text bold using attributed string in swift

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