How to create a string with format

Question

I need to create a string with format which can convert int  long  double etc  types into string  Using Obj-C  I can do it via below way   NSString  str    NSString stringWithFormat    d    f   ld       INT VALUE  FLOAT VALUE  DOUBLE VALUE  STRING VALUE     How to do same with swift

User · Answer

let str      INT VALUE     FLOAT VALUE     DOUBLE VALUE     STRING VALUE     Update  I wrote this answer before Swift had String format   added to it s API  Use the method given by the top answer

User · Answer

The beauty of String format   is that you can save a formatting string and then reuse it later in dozen of places  It also can be localized in this single place  Where as in case of the interpolation approach you must write it again and again

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I know a lot s of time has passed since this publish  but I ve fallen in a similar situation and create a simples class to simplify my life   public struct StringMaskFormatter        public var pattern                String             public var replecementChar        Character           public var allowNumbers           Bool        true     public var allowText              Bool        false       public init pattern String  replecementChar Character      allowNumbers Bool true  allowText Bool true                self pattern              pattern         self replecementChar      replecementChar         self allowNumbers         allowNumbers         self allowText            allowText             private func prepareString string String  - gt  String            var charSet   NSCharacterSet           if allowText  amp  amp  allowNumbers               charSet   NSCharacterSet alphanumericCharacterSet   invertedSet                   else if allowText               charSet   NSCharacterSet letterCharacterSet   invertedSet                   else if allowNumbers               charSet   NSCharacterSet decimalDigitCharacterSet   invertedSet                    let result   string componentsSeparatedByCharactersInSet charSet          return result joinWithSeparator                public func createFormattedStringFrom text String  - gt  String               var resultString              if text characters count  gt  0  amp  amp  pattern characters count  gt  0                        var finalText                    var stop          false             let tempString    prepareString text               var formatIndex   pattern startIndex             var tempIndex     tempString startIndex              while  stop                               let formattingPatternRange   formatIndex    lt  formatIndex advancedBy 1                   if pattern substringWithRange formattingPatternRange     String replecementChar                        finalText   finalText stringByAppendingString pattern substringWithRange formattingPatternRange                                     else if tempString characters count  gt  0                       let pureStringRange   tempIndex    lt  tempIndex advancedBy 1                      finalText   finalText stringByAppendingString tempString substringWithRange pureStringRange                       tempIndex   tempIndex advancedBy 1                                     formatIndex   formatIndex advancedBy 1                   if formatIndex  gt   pattern endIndex    tempIndex  gt   tempString endIndex                       stop   true                                    resultString   finalText                                   return resultString            The follow link send to the complete source code  https   gist github com dedeexe d9a43894081317e7c418b96d1d081b25  This solution was base on this article  http   vojtastavik com 2015 03 29 real-time-formatting-in-uitextfield-swift-basics

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There is a simple solution I learned with  We  lt 3 Swift  if you can t either import Foundation  use round   and or does not want a String   var number   31 726354765 var intNumber   Int number   1000 0  var roundedNumber   Double intNumber    1000 0   result  31 726

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Success to try it    var letters NSString    abcdefghijkl          var strRendom   NSMutableString stringWithCapacity strlength          for var i 0  i lt strlength  i                 let rndString   Int arc4random     12                let strlk   NSString format   lt  NSString  gt    lt  CVarArg    gt               let strlk   NSString format    c   letters characterAtIndex rndString               strRendom appendString String strlk

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No NSString required   String format   Value   3 2f tResult   3 2f   arguments   2 7  99 8     or   String format  Value   3 2f tResult   3 2f   2 7  99 8

User · Answer

Simple functionality is not included in Swift  expected because it s included in other languages  can often be quickly coded for reuse  Pro tip for programmers to create a bag of tricks file that contains all this reuse code  So from my bag of tricks we first need string multiplication for use in indentation   inlinable func    string  String  scalar  Int  - gt  String       let array    String  repeating  string  count  scalar      return array joined separator   quot  quot      and then the code to add commas  extension Int        inlinable var withCommas String           var i   self         var retValue  String               while i  gt   1000               retValue append String format  quot  03d quot  i 1000               i    1000                   retValue append  quot   i  quot           return retValue reversed   joined separator   quot   quot               inlinable func withCommas   count Int   0  - gt  String           let retValue   self withCommas         let indentation   count - retValue count         let indent String   indentation  gt   0    quot   quot    indentation    quot  quot           return indent   retValue          I just wrote this last function so I could get the columns to line up  The  inlinable is great because it takes small functions and reduces their functionality so they run faster  You can use either the variable version or  to get a fixed column  use the function version  Lengths set less than the needed columns will just expand the field  Now you have something that is pure Swift and does not rely on some old objective C routine for NSString

User · Answer

let INT VALUE 80 let FLOAT VALUE Double  80 9999 let doubleValue 65 0 let DOUBLE VALUE Double  65 56 let STRING VALUE  Hello   let str   NSString format   d    f   ld       INT VALUE  FLOAT VALUE  DOUBLE VALUE  STRING VALUE    println str

User · Answer

I would argue that both  let str   String format   d   f   ld   INT VALUE  FLOAT VALUE  DOUBLE VALUE    and  let str      INT VALUE     FLOAT VALUE     DOUBLE VALUE     are both acceptable since the user asked about formatting and both cases fit what they are asking for      I need to create a string with format which can convert int  long  double etc  types into string     Obviously the former allows finer control over the formatting than the latter  but that does not mean the latter is not an acceptable answer

User · Answer

First read Official documentation for Swift language   Answer should be  var str      INT VALUE      FLOAT VALUE      DOUBLE VALUE     STRING VALUE   println str    Here   1  Any floating point value by default double   EX   var myVal   5 2    its double by default    -  If you want to display floating point value then you need to explicitly define such like a   EX       var myVal Float   5 2    now its float value    This is far more clear

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var str      INT VALUE      FLOAT VALUE      DOUBLE VALUE     STRING VALUE

User · Answer

nothing special  let str   NSString format   d    f   ld       INT VALUE  FLOAT VALUE  LONG VALUE  STRING VALUE

User · Answer

Use this following code       let intVal 56     let floatval Double 56 897898     let doubleValue 89 0     let explicitDaouble Double 89 56     let stringValue  Hello       let stringValue  String   stringValue  Integer   intVal  Float   floatval  Double   doubleValue  ExplicitDouble   explicitDaouble

User · Answer

I think this could help you   let timeNow   time nil  let aStr   String format      x    timeNow in hex     timeNow  print aStr    Example result   timeNow in hex  5cdc9c8d

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