NSRange from Swift Range

Question

Problem  NSAttributedString takes an NSRange while I m using a Swift String that uses Range  let text    Long paragraph saying something goes here   let textRange   text startIndex   lt text endIndex let attributedString   NSMutableAttributedString string  text   text enumerateSubstringsInRange textRange  options  NSStringEnumerationOptions ByWords     substring  substringRange  enclosingRange  stop  - gt     in      if  substring     saying             attributedString addAttribute NSForegroundColorAttributeName  value  NSColor redColor    range  substringRange             Produces the following error      error   Range  is not convertible to  NSRange            attributedString addAttribute NSForegroundColorAttributeName  value  NSColor redColor    range  substringRange

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Possible Solution  Swift provides distance   which measures the distance between start and end that can be used to create an NSRange   let text    Long paragraph saying something goes here   let textRange   text startIndex   lt text endIndex let attributedString   NSMutableAttributedString string  text   text enumerateSubstringsInRange textRange  options  NSStringEnumerationOptions ByWords     substring  substringRange  enclosingRange  stop  - gt     in     let start   distance text startIndex  substringRange startIndex      let length   distance substringRange startIndex  substringRange endIndex      let range   NSMakeRange start  length         println  word    substring  -   d1  to   d2             if  substring     saying                 attributedString addAttribute NSForegroundColorAttributeName  value  NSColor redColor    range  range

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For cases like the one you described  I found this to work  It s relatively short and sweet    let attributedString   NSMutableAttributedString string   follow the yellow brick road     can essentially come from a textField text as well  will need to unwrap though   let text    follow the yellow brick road   let str   NSString string  text    let theRange   str rangeOfString  yellow    attributedString addAttribute NSForegroundColorAttributeName  value  UIColor yellowColor    range  theRange

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The answers are fine  but with Swift 4 you could simplify your code a bit   let text    Test string  let substring    string   let substringRange   text range of  substring   let nsRange   NSRange substringRange  in  text    Be cautious  as the result of range function has to be unwrapped

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Swift 3 Extension Variant  that preserves existing attributes    extension UILabel     func setLineHeight lineHeight  CGFloat        guard self text    nil  amp  amp  self attributedText    nil else   return       var attributedString   NSMutableAttributedString        if let attributedText   self attributedText         attributedString   NSMutableAttributedString attributedString  attributedText        else if let text   self text         attributedString   NSMutableAttributedString string  text             let style   NSMutableParagraphStyle       style lineSpacing   lineHeight     style alignment   self textAlignment     let str   NSString string  attributedString string       attributedString addAttribute NSParagraphStyleAttributeName                                    value  style                                    range  str range of  str as String       self attributedText   attributedString

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Swift String ranges and NSString ranges are not  compatible   For example  an emoji like  counts as one Swift character  but as two NSString characters  a so-called UTF-16 surrogate pair    Therefore your suggested solution will produce unexpected results if the string contains such characters  Example   let text    Long paragraph saying   let textRange   text startIndex   lt text endIndex let attributedString   NSMutableAttributedString string  text   text enumerateSubstringsInRange textRange  options  NSStringEnumerationOptions ByWords     substring  substringRange  enclosingRange  stop  - gt     in     let start   distance text startIndex  substringRange startIndex      let length   distance substringRange startIndex  substringRange endIndex      let range   NSMakeRange start  length       if  substring     saying             attributedString addAttribute NSForegroundColorAttributeName  value  NSColor redColor    range  range           println attributedString    Output    Long paragra   ph say      NSColor    NSCalibratedRGBColorSpace 1 0 0 1    ing       As you see   ph say  has been marked with the attribute  not  saying    Since NS Mutable AttributedString ultimately requires an NSString and an NSRange  it is actually better to convert the given string to NSString first  Then the substringRange is an NSRange and you don t have to convert the ranges anymore   let text    Long paragraph saying   let nsText   text as NSString let textRange   NSMakeRange 0  nsText length  let attributedString   NSMutableAttributedString string  nsText   nsText enumerateSubstringsInRange textRange  options  NSStringEnumerationOptions ByWords     substring  substringRange  enclosingRange  stop  - gt     in      if  substring     saying             attributedString addAttribute NSForegroundColorAttributeName  value  NSColor redColor    range  substringRange           println attributedString    Output    Long paragraph    saying      NSColor    NSCalibratedRGBColorSpace 1 0 0 1           Update for Swift 2   let text    Long paragraph saying   let nsText   text as NSString let textRange   NSMakeRange 0  nsText length  let attributedString   NSMutableAttributedString string  text   nsText enumerateSubstringsInRange textRange  options   ByWords  usingBlock         substring  substringRange        in      if  substring     saying             attributedString addAttribute NSForegroundColorAttributeName  value  NSColor redColor    range  substringRange           print attributedString    Update for Swift 3   let text    Long paragraph saying   let nsText   text as NSString let textRange   NSMakeRange 0  nsText length  let attributedString   NSMutableAttributedString string  text   nsText enumerateSubstrings in  textRange  options   byWords  using         substring  substringRange        in      if  substring     saying             attributedString addAttribute NSForegroundColorAttributeName  value  NSColor red  range  substringRange           print attributedString    Update for Swift 4   As of Swift 4  Xcode 9   the Swift standard library provides method to convert between Range lt String Index gt  and NSRange  Converting to NSString is no longer necessary   let text    Long paragraph saying   let attributedString   NSMutableAttributedString string  text   text enumerateSubstrings in  text startIndex   lt text endIndex  options   byWords         substring  substringRange        in     if substring     saying            attributedString addAttribute  foregroundColor  value  NSColor red                                        range  NSRange substringRange  in  text           print attributedString    Here substringRange is a Range lt String Index gt   and that is converted to the corresponding NSRange with  NSRange substringRange  in  text

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func formatAttributedStringWithHighlights text  String  highlightedSubString  String   formattingAttributes   String  AnyObject   - gt  NSAttributedString       let mutableString   NSMutableAttributedString string  text       let text   text as NSString            convert to NSString be we need NSRange     if let highlightedSubString   highlightedSubString           let highlightedSubStringRange   text rangeOfString highlightedSubString     find first occurence         if highlightedSubStringRange length  gt  0            check for not found             mutableString setAttributes formattingAttributes  range  highlightedSubStringRange                       return mutableString

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Swift 4   Sure  I know that Swift 4 has an extension for NSRange already   public init lt R  S gt    region  R  in target  S  where R   RangeExpression      S   StringProtocol       R Bound    String Index  S Index    String Index   I know in most cases this init is enough  See its usage   let string    Many animals here         if let range   string range of            print  string as NSString  substring with  NSRange range  in  string                But conversion can be done directly from Range lt  String Index   to NSRange without Swift s String instance   Instead of generic init usage which requires from you the target parameter as String and if you don t have target string at hand you can create conversion directly  extension NSRange       public init   range Range lt String Index gt             self init location  range lowerBound encodedOffset                length  range upperBound encodedOffset -                       range lowerBound encodedOffset            or you can create the specialized extension for Range itself  extension Range where Bound    String Index       var nsRange NSRange       return NSRange location  self lowerBound encodedOffset                       length  self upperBound encodedOffset -                              self lowerBound encodedOffset            Usage   let string    Many animals here        if let range   string range of           print  string as NSString  substring with  NSRange range               or  if let nsrange   string range of       nsRange      print  string as NSString  substring with  nsrange              Swift 5   Due to the migration of Swift strings to UTF-8 encoding by default  the usage of encodedOffset is considered as deprecated and Range cannot be converted to NSRange without an instance of String itself  because in order to calculate the offset we need the source string which is encoded in UTF-8 and it should be converted to UTF-16 before calculating offset  So best approach  for now  is to use generic init

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I love the Swift language  but using NSAttributedString with a Swift Range that is not compatible with NSRange has made my head hurt for too long  So to get around all that garbage I devised the following methods to return an NSMutableAttributedString with the highlighted words set with your color    This does not work for emojis  Modify if you must   extension String       func getRanges of string  String  - gt   NSRange            var ranges  NSRange               if contains string                let words   self components separatedBy                   var position Int   0             for word in words                   if word lowercased      string lowercased                         let startIndex   position                     let endIndex   word characters count                     let range   NSMakeRange startIndex  endIndex                      ranges append range                                    position     word characters count   1      1 for space                                 return ranges           func highlight   words   String   this color  UIColor  - gt  NSMutableAttributedString           let attributedString   NSMutableAttributedString string  self          for word in words               let ranges   getRanges of  word              for range in ranges                   attributedString addAttributes  NSForegroundColorAttributeName  color   range  range                                  return attributedString           Usage      The strings you re interested in let string    The dog ran after the cat  let words     the    ran       Highlight words and get back attributed string let attributedString   string highlight words  this   yellow      Set attributed string label attributedText   attributedString

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My solution is a string extension that first gets the swift range then get s the distance from the start of the string to the start and end of the substring  These values are then used to calculate the start and length of the substring  We can then apply these values to the NSMakeRange constructor  This solution works with substrings that consist of multiple words  which a lot of the solutions here using enumerateSubstrings let me down on  extension String        func NSRange of substring  String  - gt  NSRange               Get the swift range          guard let range   range of  substring  else   return nil               Get the distance to the start of the substring         let start   distance from  startIndex  to  range lowerBound  as Int           Get the distance to the end of the substring         let end   distance from  startIndex  to  range upperBound  as Int            length   endOfSubstring - startOfSubstring           start   startOfSubstring         return NSMakeRange start  end - start

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Swift 4  I think  there are two ways   1  NSRange range  in     2  NSRange location   length     Sample code   let attributedString   NSMutableAttributedString string   Sample Text 12345   attributes    font   UIFont systemFont ofSize  15 0        NSRange range  in    if let range   attributedString string range of   Sample          attributedString addAttribute  foregroundColor  value  UIColor orange  range  NSRange range  in  attributedString string         NSRange location    length    if let range   attributedString string range of   12345         attributedString addAttribute  foregroundColor  value  UIColor green  range  NSRange location  range lowerBound encodedOffset  length  range upperBound encodedOffset - range lowerBound encodedOffset       Screen Shot

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For me this works perfectly   let font   UIFont systemFont ofSize  12  weight   medium  let text    text  let attString   NSMutableAttributedString string   exemple text       attString addAttributes   font  font   range  attString string as NSString  range of  text    label attributedText   attString

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let text String    Hello Friend   let searchRange NSRange   NSRange location 0 length  text characters count   let range Range  lt Int  gt    Range  lt Int  gt  init start  searchRange location  end  searchRange length

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