Swift apply uppercaseString to only the first letter of a string

Question

I am trying to make an autocorrect system  and when a user types a word with a capital letter  the autocorrect doesn t work  In order to fix this  I made a copy of the string typed  applied  lowercaseString  and then compared them  If the string is indeed mistyped  it should correct the word  However then the word that replaces the typed word is all lowercase  So I need to apply  uppercaseString to only the first letter  I originally thought I could use  nameOfString 0    but this apparently does not work  How can I get the first letter of the string to uppercase  and then be able to print the full string with the first letter capitalized    Thanks for any help

User · Answer

Here   s a version for Swift 5 that uses the Unicode scalar properties API to bail out if the first letter is already uppercase  or doesn   t have a notion of case   extension String     func firstLetterUppercased   - gt  String       guard let first   first  first isLowercase else   return self       return String first  uppercased     dropFirst

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Incorporating the answers above  I wrote a small extension that capitalizes the first letter of every word  because that s what I was looking for and figured someone else could use it    I humbly submit   extension String       var wordCaps String           let listOfWords  String    self componentsSeparatedByString              var returnString  String              for word in listOfWords               if word                         var capWord   word lowercaseString as String                 capWord replaceRange startIndex   startIndex  with  String capWord capWord startIndex   uppercaseString                  returnString   returnString   capWord                                       if returnString hasSuffix                    returnString removeAtIndex returnString endIndex predecessor                      return returnString

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In swift 5  https   www hackingwithswift com example-code strings how-to-capitalize-the-first-letter-of-a-string  extension String       func capitalizingFirstLetter   - gt  String           return prefix 1  capitalized   dropFirst              mutating func capitalizeFirstLetter             self   self capitalizingFirstLetter             use with your string   let test    the rain in Spain  print test capitalizingFirstLetter

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Capitalize the first character in the string  extension String       var capitalizeFirst  String           if self characters count    0               return self          return String self self startIndex   capitalized   String self characters dropFirst

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Add this line in viewDidLoad   method       txtFieldName autocapitalizationType   UITextAutocapitalizationType words

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Including mutating and non mutating versions that are consistent with API guidelines   Swift 3   extension String       func capitalizingFirstLetter   - gt  String           let first   String characters prefix 1   capitalized         let other   String characters dropFirst            return first   other            mutating func capitalizeFirstLetter             self   self capitalizingFirstLetter             Swift 4   extension String       func capitalizingFirstLetter   - gt  String         return prefix 1  uppercased     self lowercased   dropFirst              mutating func capitalizeFirstLetter           self   self capitalizingFirstLetter

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Credits to Leonardo Savio Dabus   I imagine most use cases is to get Proper Casing   import Foundation  extension String        var toProper String           var result   lowercaseString         result replaceRange startIndex   startIndex  with  String self startIndex   capitalizedString          return result

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Swift 4  Xcode 9 1   extension String       var capEachWord  String           return self split separator       map   word in             return String  word startIndex   uppercased     word lowercased   dropFirst             joined separator

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extension String       var lowercased String           var result   Array lt Character gt  self characters           if let first   result first   result 0    Character String first  uppercaseString            return String result

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If your string is all caps then below method will work  labelTitle text   remarks  lowercased   firstUppercased   This extension will helps you  extension StringProtocol       var firstUppercased  String           guard let first   first else   return              return String first  uppercased     dropFirst

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Swift 4 0  string capitalized with  nil    or   string capitalized   However this capitalizes first letter of every word  Apple s documentation      A capitalized string is a string with the first character in each word changed to its corresponding uppercase value  and all remaining characters set to their corresponding lowercase values  A    word    is any sequence of characters delimited by spaces  tabs  or line terminators  Some common word delimiting punctuation isn   t considered  so this property may not generally produce the desired results for multiword strings  See the getLineStart   end contentsEnd for   method for additional information

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Swift 3  xcode 8 3 3   Uppercase all first characters of string  let str    your string  let capStr   str capitalized    Your String   Uppercase all characters  let str    your string  let upStr   str uppercased      YOUR STRING   Uppercase only first character of string   var str    your string   let capStr   String str characters prefix 1   uppercased     String str characters dropFirst       Your string

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Swift 4  func firstCharacterUpperCase   - gt  String           if self count    0   return self           return prefix 1  uppercased     dropFirst   lowercased

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From Swift 3 you can easily use  textField autocapitalizationType   UITextAutocapitalizationType sentences

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Swift 2 0  Single line    String nameOfString characters prefix 1   uppercaseString   String nameOfString characters dropFirst

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Swift 3 Update  The replaceRange func is now replaceSubrange  nameOfString replaceSubrange nameOfString startIndex   nameOfString startIndex  with  String nameOfString nameOfString startIndex   capitalized

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Here s the way I did it in small steps  its similar to  Kirsteins    func capitalizedPhrase phrase String  - gt  String       let firstCharIndex   advance phrase startIndex  1      let firstChar   phrase substringToIndex firstCharIndex  uppercaseString     let firstCharRange   phrase startIndex   lt firstCharIndex     return phrase stringByReplacingCharactersInRange firstCharRange  withString  firstChar

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My solution   func firstCharacterUppercaseString string  String  - gt  String       var str   string as NSString     let firstUppercaseCharacter   str substringToIndex 1  uppercaseString     let firstUppercaseCharacterString   str stringByReplacingCharactersInRange NSMakeRange 0  1   withString  firstUppercaseCharacter      return firstUppercaseCharacterString

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Swift 3 0   for  Hello World   nameOfString capitalized   or for  HELLO WORLD   nameOfString uppercased

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func helperCapitalizeFirstLetter stringToBeCapd String - gt String      let capString   stringToBeCapd substringFromIndex stringToBeCapd startIndex  capitalizedString     return capString     Also works just pass your string in and get a capitalized one back

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In Swift 3 0  this is a little bit faster and safer than the accepted answer     extension String       func firstCharacterUpperCase   - gt  String           if let firstCharacter   characters first               return replacingCharacters in  startIndex   lt index after  startIndex   with  String firstCharacter  uppercased                      return              nameOfString capitalized won t work  it will capitalize every words in the sentence

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I m getting the first character duplicated with Kirsteins  solution  This will capitalise the first character  without seeing double   var s  String    hello world  s   prefix s  1  capitalizedString   suffix s  countElements s  - 1    I don t know whether it s more or less efficient  I just know that it gives me the desired result

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For first character in word use  capitalized in swift and for whole-word use  uppercased

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Swift 5 1 or later  extension StringProtocol       var firstUppercased  String   prefix 1  uppercased     dropFirst         var firstCapitalized  String   prefix 1  capitalized   dropFirst           Swift 5  extension StringProtocol       var firstUppercased  String   return prefix 1  uppercased     dropFirst         var firstCapitalized  String   return prefix 1  capitalized   dropFirst            Swift  first      S   Swift  last       t   hello world     firstUppercased      Hello world          firstCapitalized              firstCapitalized              firstCapitalized

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I m partial to this version  which is a cleaned up version from another answer   extension String     var capitalizedFirst  String       let characters   self characters     if let first   characters first         return String first  uppercased                   String characters dropFirst              return self         It strives to be more efficient by only evaluating self characters once  and then uses consistent forms to create the sub-strings

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extension String       func firstCharacterUpperCase   - gt  String            let lowercaseString   self lowercaseString          return lowercaseString stringByReplacingCharactersInRange lowercaseString startIndex   lowercaseString startIndex  withString  String lowercaseString lowercaseString startIndex   uppercaseString           let x    heLLo  let m   x firstCharacterUpperCase     For Swift 5   extension String       func firstCharacterUpperCase   - gt  String            guard  isEmpty else   return nil           let lowerCasedString   self lowercased           return lowerCasedString replacingCharacters in  lowerCasedString startIndex   lowerCasedString startIndex  with  String lowerCasedString lowerCasedString startIndex   uppercased

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For swift 5  you can simple do like that   yourString firstUppercased   Sample   abc  -   Abc

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If you want to capitalised each word of string you can use this extension  Swift 4 Xcode 9 2  extension String       var wordUppercased  String           var aryOfWord   self split separator               aryOfWord    aryOfWord map  String  0 first   uppercased      0 dropFirst             return aryOfWord joined separator                 Used  print  simple text example  wordUppercased    output    Simple Text Example

[ios] Swift apply .uppercaseString to only the first letter of a string

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