How to use hex color values

Question

I am trying to use hex color values in Swift  instead of the few standard ones that UIColor allows you to use  but I have no idea how to do it    Example  how would I use  ffffff as a color

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Just some addiotion to the first answer

(haven't cehcked the alpha, may need to add an if netHext > 0xffffff):

extension UIColor {

struct COLORS_HEX {
    static let Primary = 0xffffff
    static let PrimaryDark = 0x000000
    static let Accent = 0xe89549
    static let AccentDark = 0xe27b2a
    static let TextWhiteSemiTransparent = 0x80ffffff
}

convenience init(red: Int, green: Int, blue: Int, alphaH: Int) {
    assert(red >= 0 && red <= 255, "Invalid red component")
    assert(green >= 0 && green <= 255, "Invalid green component")
    assert(blue >= 0 && blue <= 255, "Invalid blue component")
    assert(alphaH >= 0 && alphaH <= 255, "Invalid alpha component")

    self.init(red: CGFloat(red) / 255.0, green: CGFloat(green) / 255.0, blue: CGFloat(blue) / 255.0, alpha: CGFloat(alphaH) / 255.0)
}

convenience init(netHex:Int) {
    self.init(red:(netHex >> 16) & 0xff, green:(netHex >> 8) & 0xff, blue:netHex & 0xff, alphaH: (netHex >> 24) & 0xff)
}

}

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Swift 2 0   In viewDidLoad     var viewColor UIColor     viewColor   UIColor       let colorInt UInt     colorInt   0x000000     viewColor   UIColorFromRGB colorInt      self View backgroundColor viewColor    func UIColorFromRGB rgbValue  UInt  - gt  UIColor       return UIColor          red  CGFloat  rgbValue  amp  0xFF0000   gt  gt  16    255 0          green  CGFloat  rgbValue  amp  0x00FF00   gt  gt  8    255 0          blue  CGFloat rgbValue  amp  0x0000FF    255 0          alpha  CGFloat 1 0

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Warning   scanHexInt32  was deprecated in iOS 13 0  was fixed   The sample should work on Swift2 2 and above Swift2 x  Swift3 x  Swift4 x  Swift5 x    extension UIColor           hex sample  0xf43737     convenience init   hex  Int  alpha  Double   1 0            self init red  CGFloat  hex  gt  gt  16   amp  0xFF    255 0  green  CGFloat  hex  gt  gt  8   amp  0xFF    255 0  blue  CGFloat  hex   amp  0xFF    255 0  alpha  CGFloat 255   alpha    255             convenience init   hexString  String  alpha  Double   1 0            let hex   hexString trimmingCharacters in  CharacterSet alphanumerics inverted          var int   UInt64           Scanner string  hex  scanHexInt64  amp int           let r  g  b  UInt64         switch hex count           case 3     RGB  12-bit               r  g  b      int  gt  gt  8    17   int  gt  gt  4  amp  0xF    17   int  amp  0xF    17          case 6     RGB  24-bit               r  g  b     int  gt  gt  16  int  gt  gt  8  amp  0xFF  int  amp  0xFF          default               r  g  b     1  1  0                     self init red  CGFloat r    255  green  CGFloat g    255  blue  CGFloat b    255  alpha  CGFloat 255   alpha    255             convenience init r  CGFloat  g  CGFloat  b  CGFloat  a  CGFloat   1            self init red   r   255   green   g   255   blue   b   255   alpha  a            Use them like below   UIColor 0xF54A45  UIColor 0xF54A45  alpha  0 7  UIColor   f44   UIColor   f44   alpha  0 7  UIColor   F54A45   UIColor   F54A45   alpha  0 7  UIColor  F54A45   UIColor  F54A45   alpha  0 7  UIColor r  245 0  g  73  b  69  UIColor r  245 0  g  73  b  69  a  0 7

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If you re wanting from hex string rather than hex value        let hex    quot  FADE2B quot      yellow     let color   NSColor fromHex  hex   Supported formats    quot  fff quot      RGB  quot  ffff quot      RGBA  quot  ffffff quot      RRGGBB  quot  ffffffff quot      RRGGBBAA  with or without the   character      extension NSColor               Initialises NSColor from a hexadecimal string  Color is clear if string is invalid              - Parameter fromHex  supported formats are  quot  RGB quot    quot  RGBA quot    quot  RRGGBB quot    quot  RRGGBBAA quot   with or without the   character         public convenience init fromHex String                var r   0  g   0  b   0  a   0             let offset   fromHex hasPrefix  quot   quot     1   0             let ch   fromHex map  0              switch ch count - offset                case 4                  a   ch offset 3  hexDigitValue    0                 fallthrough             case 3                  r   ch offset 0  hexDigitValue    0                 g   ch offset 1  hexDigitValue    0                 b   ch offset 2  hexDigitValue    0                 break             case 8                  a    ch offset 6  hexDigitValue    0    16    ch offset 7  hexDigitValue    0                  fallthrough             case 6                  r    ch offset 0  hexDigitValue    0    16    ch offset 1  hexDigitValue    0                  g    ch offset 2  hexDigitValue    0    16    ch offset 3  hexDigitValue    0                  b    ch offset 4  hexDigitValue    0    16    ch offset 5  hexDigitValue    0                  break             default                  break                           self init red  CGFloat r  255  green  CGFloat g  255  blue  CGFloat b  255  alpha  CGFloat a  255                                      Author  Andrew Kingdom  License  CC BY

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With Swift 2 0 and Xcode 7 0 1 you can create this function          Creates a UIColor from a Hex string      func colorWithHexString  hex String  - gt  UIColor           var cString String   hex stringByTrimmingCharactersInSet NSCharacterSet whitespaceAndNewlineCharacterSet    uppercaseString          if  cString hasPrefix                     cString    cString as NSString  substringFromIndex 1                     if  cString characters count    6                return UIColor grayColor                      let rString    cString as NSString  substringToIndex 2          let gString     cString as NSString  substringFromIndex 2  as NSString  substringToIndex 2          let bString     cString as NSString  substringFromIndex 4  as NSString  substringToIndex 2           var r CUnsignedInt   0  g CUnsignedInt   0  b CUnsignedInt   0          NSScanner string  rString  scanHexInt  amp r          NSScanner string  gString  scanHexInt  amp g          NSScanner string  bString  scanHexInt  amp b            return UIColor red  CGFloat r    255 0  green  CGFloat g    255 0  blue  CGFloat b    255 0  alpha  CGFloat 1           and then use it in this way   let color1   colorWithHexString   1F437C     Updated For Swift 4  func colorWithHexString  hex String  - gt  UIColor        var cString   hex trimmingCharacters in  CharacterSet whitespacesAndNewlines  uppercased        if  cString hasPrefix                 cString    cString as NSString  substring from  1             if  cString characters count    6            return UIColor gray            let rString    cString as NSString  substring to  2      let gString     cString as NSString  substring from  2  as NSString  substring to  2      let bString     cString as NSString  substring from  4  as NSString  substring to  2       var r CUnsignedInt   0  g CUnsignedInt   0  b CUnsignedInt   0      Scanner string  rString  scanHexInt32  amp r      Scanner string  gString  scanHexInt32  amp g      Scanner string  bString  scanHexInt32  amp b        return UIColor red  CGFloat r    255 0  green  CGFloat g    255 0  blue  CGFloat b    255 0  alpha  CGFloat 1

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Here s a Swift extension on UIColor that takes a hex string   import UIKit  extension UIColor        convenience init hexString  String               Trim leading     if needed         var cleanedHexString   hexString         if hexString hasPrefix                      cleanedHexString   dropFirst hexString     Swift 1 2             cleanedHexString   String hexString characters dropFirst       Swift 2                       String - gt  UInt32         var rgbValue  UInt32   0         NSScanner string  cleanedHexString  scanHexInt  amp rgbValue              UInt32 - gt  R G B         let red   CGFloat  rgbValue  gt  gt  16   amp  0xff    255 0         let green   CGFloat  rgbValue  gt  gt  08   amp  0xff    255 0         let blue   CGFloat  rgbValue  gt  gt  00   amp  0xff    255 0          self init red  red  green  green  blue  blue  alpha  1 0

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Simple Color Extension for Swift 5 SwiftUI  Example   let myColor   Color hex 0xF2C94C    Code   import Foundation import SwiftUI  extension UIColor       convenience init hex  Int            let components                 R  CGFloat  hex  gt  gt  16   amp  0xff    255              G  CGFloat  hex  gt  gt  08   amp  0xff    255              B  CGFloat  hex  gt  gt  00   amp  0xff    255                   self init red  components R  green  components G  blue  components B  alpha  1           extension Color       public init hex  Int            self init UIColor hex  hex

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Swift 5 3  amp  SwiftUI  Hex and CSS color name support via a UIColor Gist code Swift Package SwiftUI Package Example strings   Orange  Lime  Tomato  etc  Clear  Transparent  nil  and empty string yield  UIColor clearColor  abc abc7  abc7 00FFFF  00FFFF 00FFFF77  Playground output

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This answer shows how to do it in Obj-C  The bridge is to use   let rgbValue   0xFFEEDD let r   Float  rgbValue  amp  0xFF0000   gt  gt  16  255 0 let g   Float  rgbValue  amp  0xFF00   gt  gt  8  255 0 let b   Float  rgbValue  amp  0xFF   255 0 self backgroundColor   UIColor red r  green  g  blue  b  alpha  1 0

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Swift 2 0  The code below is tested on xcode 7 2  import UIKit extension UIColor       public convenience init  colorCodeInHex  String  alpha  Float   1 0            var filterColorCode String    colorCodeInHex stringByReplacingOccurrencesOfString      withString               if  filterColorCode characters count    6               self init red  0 0  green  0 0  blue  0 0  alpha  CGFloat alpha               return                    filterColorCode   filterColorCode stringByTrimmingCharactersInSet NSCharacterSet whitespaceAndNewlineCharacterSet    uppercaseString          var range   Range start  filterColorCode startIndex advancedBy 0   end  filterColorCode startIndex advancedBy 2           let rString   filterColorCode substringWithRange range           range   Range start  filterColorCode startIndex advancedBy 2   end  filterColorCode startIndex advancedBy 4           let gString   filterColorCode substringWithRange range            range   Range start  filterColorCode startIndex advancedBy 4   end  filterColorCode startIndex advancedBy 6           let bString   filterColorCode substringWithRange range           var r CUnsignedInt   0  g CUnsignedInt   0  b CUnsignedInt   0          NSScanner string  rString  scanHexInt  amp r          NSScanner string  gString  scanHexInt  amp g          NSScanner string  bString  scanHexInt  amp b            self init red  CGFloat r    255 0  green  CGFloat g    255 0  blue  CGFloat b    255 0  alpha  CGFloat alpha           return

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The simplest way to add color programmatically is by using ColorLiteral   Just add the property ColorLiteral as shown in the example  Xcode will prompt you with a whole list of colors which you can choose  The advantage of doing so is lesser code  add HEX values or RGB  You will also get the recently used colors from the storyboard   Example   self view backgroundColor   ColorLiteral

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Swift 2 3  UIColor Extension  I Think its simpler   extension UIColor       static func colorFromHex hexString  String  alpha  CGFloat   1  - gt  UIColor             checking if hex has 7 characters or not including             if hexString characters count  lt  7               return UIColor whiteColor                       string by removing hash         let hexStringWithoutHash   hexString substringFromIndex hexString startIndex advancedBy 1              I am extracting three parts of hex color Red  first 2 characters   Green  middle 2 characters   Blue  last two characters          let eachColor                 hexStringWithoutHash substringWithRange hexStringWithoutHash startIndex   hexStringWithoutHash startIndex advancedBy 1                hexStringWithoutHash substringWithRange hexStringWithoutHash startIndex advancedBy 2    hexStringWithoutHash startIndex advancedBy 3                hexStringWithoutHash substringWithRange hexStringWithoutHash startIndex advancedBy 4    hexStringWithoutHash startIndex advancedBy 5             let hexForEach   eachColor map  CGFloat Int  0  radix  16     0     radix is base of numeric system you want to convert to  Hexadecimal has base 16            return the color by making color         return UIColor red  hexForEach 0    255  green  hexForEach 1    255  blue  hexForEach 2    255  alpha  alpha            Usage   let color   UIColor colorFromHex   25ac09

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Swift 5      extension UIColor       Converting hex string to UIColor         - Parameter hexString  input hex string convenience init hexString  String        let hex   hexString trimmingCharacters in  CharacterSet alphanumerics inverted      var int   UInt64       Scanner string  hex  scanHexInt64  amp int      let a  r  g  b  UInt64     switch hex count       case 3               a  r  g  b     255   int  gt  gt  8    17   int  gt  gt  4  amp  0xF    17   int  amp  0xF    17      case 6            a  r  g  b     255  int  gt  gt  16  int  gt  gt  8  amp  0xFF  int  amp  0xFF      case 8            a  r  g  b     int  gt  gt  24  int  gt  gt  16  amp  0xFF  int  gt  gt  8  amp  0xFF  int  amp  0xFF      default           a  r  g  b     255  0  0  0            self init red  CGFloat r    255  green  CGFloat g    255  blue  CGFloat b    255  alpha  CGFloat a    255        Call using UIColor hexString   your hex string

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Here s what I m using  Works with 6 and 8 character color strings  with or without the   symbol  Defaults to black in release and crashes in debug when initialized with an invalid string   extension UIColor       public convenience init hex  String            var r  CGFloat   0         var g  CGFloat   0         var b  CGFloat   0         var a  CGFloat   1          let hexColor   hex replacingOccurrences of       with              let scanner   Scanner string  hexColor          var hexNumber  UInt64   0         var valid   false          if scanner scanHexInt64  amp hexNumber                if hexColor count    8                   r   CGFloat  hexNumber  amp  0xff000000   gt  gt  24    255                 g   CGFloat  hexNumber  amp  0x00ff0000   gt  gt  16    255                 b   CGFloat  hexNumber  amp  0x0000ff00   gt  gt  8    255                 a   CGFloat hexNumber  amp  0x000000ff    255                 valid   true                           else if hexColor count    6                   r   CGFloat  hexNumber  amp  0xff0000   gt  gt  16    255                 g   CGFloat  hexNumber  amp  0x00ff00   gt  gt  8    255                 b   CGFloat hexNumber  amp  0x0000ff    255                 valid   true                                   if DEBUG             assert valid   UIColor initialized with invalid hex string            endif          self init red  r  green  g  blue  b  alpha  a            Usage   UIColor hex    75CC83FF   UIColor hex   75CC83FF   UIColor hex    75CC83   UIColor hex   75CC83

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UIColor   extension UIColor        convenience init hex  Int            let components                 R  CGFloat  hex  gt  gt  16   amp  0xff    255              G  CGFloat  hex  gt  gt  08   amp  0xff    255              B  CGFloat  hex  gt  gt  00   amp  0xff    255                   self init red  components R  green  components G  blue  components B  alpha  1             CGColor   extension CGColor        class func colorWithHex hex  Int  - gt  CGColorRef            return UIColor hex  hex  CGColor               Usage  let purple   UIColor hex  0xAB47BC

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Swift 5  You can create colors in Xcode as explained in the following two images     You should name the color because you reference the color by the name  As shown in image 2

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Another method  Swift 3 0  Write a extension for UIColor     To change the HexaDecimal value to Corresponding Color extension UIColor       class func uicolorFromHex   rgbValue UInt32  alpha   CGFloat - gt UIColor                let red   CGFloat  rgbValue  amp  0xFF0000   gt  gt  16    255 0         let green   CGFloat  rgbValue  amp  0xFF00   gt  gt  8    255 0         let blue   CGFloat rgbValue  amp  0xFF    255 0         return UIColor red red  green green  blue blue  alpha  alpha            you can directly create UIColor with hex like this  let carrot   UIColor uicolorFromHex 0xe67e22  alpha  1

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UIColor extension  This will greatly help you   version Swift 4 0   import UIKit extension UIColor       rgb   convenience init r  CGFloat  g  CGFloat  b  CGFloat        self init red  r 255 0  green  g 255 0  blue  b 255 0  alpha 1 0                  convenience init gray  CGFloat        self init red  gray 255 0  green  gray 255 0  blue  gray 255 0  alpha 1 0            class func randomCGColor   - gt  UIColor       return UIColor r  CGFloat arc4random uniform 256    g  CGFloat arc4random uniform 256    b  CGFloat arc4random uniform 256           hex  -Int convenience init hex Int  alpha CGFloat   1 0        self init          red    CGFloat  hex  amp  0xFF0000   gt  gt  16    255 0          green  CGFloat  hex  amp  0x00FF00   gt  gt  8     255 0          blue   CGFloat  hex  amp  0x0000FF   gt  gt  0     255 0          alpha  alpha             hex  -String convenience init hexString  String       var red    CGFloat   0 0     var green  CGFloat   0 0     var blue   CGFloat   0 0     var alpha  CGFloat   1 0     let scanner   Scanner string  hexString      var hexValue  CUnsignedLongLong   0     if scanner scanHexInt64  amp hexValue            switch  hexString characters count            case 3              red     CGFloat  hexValue  amp  0xF00   gt  gt  8          15 0             green   CGFloat  hexValue  amp  0x0F0   gt  gt  4          15 0             blue    CGFloat hexValue  amp  0x00F                 15 0         case 4              red     CGFloat  hexValue  amp  0xF000   gt  gt  12        15 0             green   CGFloat  hexValue  amp  0x0F00   gt  gt  8         15 0             blue    CGFloat  hexValue  amp  0x00F0   gt  gt  4         15 0             alpha   CGFloat hexValue  amp  0x000F                15 0         case 6              red     CGFloat  hexValue  amp  0xFF0000   gt  gt  16      255 0             green   CGFloat  hexValue  amp  0x00FF00   gt  gt  8       255 0             blue    CGFloat hexValue  amp  0x0000FF              255 0         case 8              alpha   CGFloat  hexValue  amp  0xFF000000   gt  gt  24    255 0             red     CGFloat  hexValue  amp  0x00FF0000   gt  gt  16    255 0             green   CGFloat  hexValue  amp  0x0000FF00   gt  gt  8     255 0             blue    CGFloat hexValue  amp  0x000000FF            255 0         default              log info  Invalid RGB string  number of characters after     should be either 3  4  6 or 8                   else           log error  Scan hex error             self init red red  green green  blue blue  alpha alpha

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Latest swift3 Version          extension UIColor   convenience init hexString  String        let hex   hexString trimmingCharacters in  CharacterSet alphanumerics inverted      var int   UInt32       Scanner string  hex  scanHexInt32  amp int      let a  r  g  b  UInt32     switch hex characters count       case 3     RGB  12-bit           a  r  g  b     255   int  gt  gt  8    17   int  gt  gt  4  amp  0xF    17   int  amp  0xF    17      case 6     RGB  24-bit           a  r  g  b     255  int  gt  gt  16  int  gt  gt  8  amp  0xFF  int  amp  0xFF      case 8     ARGB  32-bit           a  r  g  b     int  gt  gt  24  int  gt  gt  16  amp  0xFF  int  gt  gt  8  amp  0xFF  int  amp  0xFF      default           a  r  g  b     255  0  0  0              self init red  CGFloat r    255  green  CGFloat g    255  blue       CGFloat b    255  alpha  CGFloat a    255        Use in your class or where ever you converted into hexcolor to uicolor like in this way               let color1   UIColor hexString    FF323232

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Swift 2 0   Make an extension of UIColor   extension UIColor       convenience init hexString String            let hexString NSString   hexString stringByTrimmingCharactersInSet NSCharacterSet whitespaceAndNewlineCharacterSet            let scanner              NSScanner string  hexString as String          if  hexString hasPrefix                     scanner scanLocation   1                    var color UInt32   0         scanner scanHexInt  amp color           let mask   0x000000FF         let r   Int color  gt  gt  16   amp  mask         let g   Int color  gt  gt  8   amp  mask         let b   Int color   amp  mask          let red     CGFloat r    255 0         let green   CGFloat g    255 0         let blue    CGFloat b    255 0         self init red red  green green  blue blue  alpha 1             func toHexString   - gt  String           var r CGFloat   0         var g CGFloat   0         var b CGFloat   0         var a CGFloat   0         getRed  amp r  green   amp g  blue   amp b  alpha   amp a          let rgb Int    Int  r 255  lt  lt 16    Int  g 255  lt  lt 8    Int  b 255  lt  lt 0         return NSString format    06x   rgb  as String            Usage     Hex to Color     let countPartColor    UIColor hexString   E43038      Color to Hex let colorHexString    UIColor red  228  green  48  blue  56  alpha  1 0  toHexString

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ffffff are actually 3 color components in hexadecimal notation - red ff  green ff and blue ff  You can write hexadecimal notation in Swift using 0x prefix  e g 0xFF  To simplify the conversion  let s create an initializer that takes integer  0 - 255  values   extension UIColor      convenience init red  Int  green  Int  blue  Int           assert red  gt   0  amp  amp  red  lt   255   Invalid red component          assert green  gt   0  amp  amp  green  lt   255   Invalid green component          assert blue  gt   0  amp  amp  blue  lt   255   Invalid blue component           self init red  CGFloat red    255 0  green  CGFloat green    255 0  blue  CGFloat blue    255 0  alpha  1 0           convenience init rgb  Int           self init             red   rgb  gt  gt  16   amp  0xFF             green   rgb  gt  gt  8   amp  0xFF             blue  rgb  amp  0xFF                   Usage   let color   UIColor red  0xFF  green  0xFF  blue  0xFF  let color2   UIColor rgb  0xFFFFFF    How to get alpha   Depending on your use case  you can simply use the native UIColor withAlphaComponent method  e g   let semitransparentBlack   UIColor rgb  0x000000  withAlphaComponent 0 5    Or you can add an additional  optional  parameter to the above methods   convenience init red  Int  green  Int  blue  Int  a  CGFloat   1 0        self init          red  CGFloat red    255 0          green  CGFloat green    255 0          blue  CGFloat blue    255 0          alpha  a          convenience init rgb  Int  a  CGFloat   1 0        self init          red   rgb  gt  gt  16   amp  0xFF          green   rgb  gt  gt  8   amp  0xFF          blue  rgb  amp  0xFF          a  a            we cannot name the parameter alpha because of a name collision with the existing initializer    Called as   let color   UIColor red  0xFF  green  0xFF  blue  0xFF  a  0 5  let color2   UIColor rgb  0xFFFFFF  a  0 5    To get the alpha as an integer 0-255  we can  convenience init red  Int  green  Int  blue  Int  a  Int   0xFF        self init          red  CGFloat red    255 0          green  CGFloat green    255 0          blue  CGFloat blue    255 0          alpha  CGFloat a    255 0             let s suppose alpha is the first component  ARGB  convenience init argb  Int        self init          red   argb  gt  gt  16   amp  0xFF          green   argb  gt  gt  8   amp  0xFF          blue  argb  amp  0xFF          a   argb  gt  gt  24   amp  0xFF           Called as  let color   UIColor red  0xFF  green  0xFF  blue  0xFF  a  0xFF  let color2   UIColor argb  0xFFFFFFFF    Or a combination of the previous methods  There is absolutely no need to use strings

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You can use it in swift 5  SWIFT 5  import UIKit  extension UIColor       static func hexStringToUIColor  hex String  - gt  UIColor           var cString String   hex trimmingCharacters in   whitespacesAndNewlines  uppercased            if  cString hasPrefix                     cString remove at  cString startIndex                     if   cString count     6                return UIColor gray                    var rgbValue UInt32   0         Scanner string  cString  scanHexInt32  amp rgbValue           return UIColor              red  CGFloat  rgbValue  amp  0xFF0000   gt  gt  16    255 0              green  CGFloat  rgbValue  amp  0x00FF00   gt  gt  8    255 0              blue  CGFloat rgbValue  amp  0x0000FF    255 0              alpha  CGFloat 1 0

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RGBA Version Swift 3 4 I like  Luca s answer as i think it s the most elegant  However I don t want my colours specified in ARGB  I d rather RGBA   also i needed to hack in the case of dealing with strings that specify 1 character for each of the channels  quot  FFFA quot   This version also adds error throwing   strips the     character if it s included in the string  Here is my modified form for Swift  public enum ColourParsingError  Error            case invalidInput String    extension UIColor       public convenience init hexString  String  throws               let hexString   hexString replacingOccurrences of   quot   quot   with   quot  quot           let hex   hexString trimmingCharacters in NSCharacterSet alphanumerics inverted          var int   UInt32           Scanner string  hex  scanHexInt32  amp int          let a  r  g  b  UInt32         switch hex count                    case 3     RGB  12-bit               r  g  b a      int  gt  gt  8    17   int  gt  gt  4  amp  0xF    17   int  amp  0xF    17 255            iCSS specification in the form of  F0FA         case 4     RGB  24-bit               r  g  b a      int  gt  gt  12    17   int  gt  gt  8  amp  0xF    17   int  gt  gt  4  amp  0xF    17   int  amp  0xF    17          case 6     RGB  24-bit               r  g  b  a     int  gt  gt  16  int  gt  gt  8  amp  0xFF  int  amp  0xFF 255          case 8     ARGB  32-bit               r  g  b  a     int  gt  gt  24  int  gt  gt  16  amp  0xFF  int  gt  gt  8  amp  0xFF  int  amp  0xFF          default              throw ColourParsingError invalidInput  quot String is not a valid hex colour string    hexString  quot                     self init red  CGFloat r    255  green  CGFloat g    255  blue  CGFloat b    255  alpha  CGFloat a    255

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For swift 3  extension String       var hexColor  UIColor                   let hex   trimmingCharacters in  CharacterSet alphanumerics inverted          var int   UInt32                  Scanner string  hex  scanHexInt32  amp int          let a  r  g  b  UInt32         switch hex characters count           case 3     RGB  12-bit               a  r  g  b     255   int  gt  gt  8    17   int  gt  gt  4  amp  0xF    17   int  amp  0xF    17          case 6     RGB  24-bit               a  r  g  b     255  int  gt  gt  16  int  gt  gt  8  amp  0xFF  int  amp  0xFF          case 8     ARGB  32-bit               a  r  g  b     int  gt  gt  24  int  gt  gt  16  amp  0xFF  int  gt  gt  8  amp  0xFF  int  amp  0xFF          default              return  clear                   return UIColor red  CGFloat r    255  green  CGFloat g    255  blue  CGFloat b    255  alpha  CGFloat a    255

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extension UIColor          convenience init hex  Int  alpha  Double   1 0           self init red  CGFloat  hex gt  gt 16  amp 0xFF  255 0  green CGFloat  hex gt  gt 8  amp 0xFF  255 0  blue  CGFloat  hex  amp 0xFF  255 0  alpha   CGFloat 255   alpha    255             Use this extension like    let selectedColor   UIColor hex  0xFFFFFF  let selectedColor   UIColor hex  0xFFFFFF  alpha  0 5

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Swift 4   Combining the answers of Sulthan and Luca Torella    extension UIColor       convenience init hexFromString String  alpha CGFloat   1 0            var cString String   hexFromString trimmingCharacters in   whitespacesAndNewlines  uppercased           var rgbValue UInt32   10066329   color  999999 if string has wrong format          if  cString hasPrefix                     cString remove at  cString startIndex                     if   cString count     6                Scanner string  cString  scanHexInt32  amp rgbValue                     self init              red  CGFloat  rgbValue  amp  0xFF0000   gt  gt  16    255 0              green  CGFloat  rgbValue  amp  0x00FF00   gt  gt  8    255 0              blue  CGFloat rgbValue  amp  0x0000FF    255 0              alpha  alpha                     Usage examples   let myColor   UIColor hexFromString   4F9BF5    let myColor   UIColor hexFromString    4F9BF5    let myColor   UIColor hexFromString    4F9BF5   alpha  0 5

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extension UIColor        convenience init r  CGFloat  g  CGFloat  b  CGFloat  a  CGFloat   1            self init red  r 255  green  g 255  blue  b 255  alpha  a             convenience init hex  Int  alpha  CGFloat   1            self init r  CGFloat  hex  gt  gt  16   amp  0xff   g  CGFloat  hex  gt  gt  08   amp  0xff   b  CGFloat  hex  gt  gt  00   amp  0xff   a  alpha

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Swift 4 0  use this Single line of method   override func viewDidLoad         super viewDidLoad       let color   UIColor hexColor   FF00A0      self view backgroundColor   color      You have to create new Class or use any controller where u need to use Hex color  This extension class provide you UIColor that will convert Hex to RGB color   extension UIColor   convenience init hexColor  String        let scannHex   Scanner string  hexColor      var rgbValue  UInt64   0     scannHex scanLocation   0     scannHex scanHexInt64  amp rgbValue      let r    rgbValue  amp  0xff0000   gt  gt  16     let g    rgbValue  amp  0xff00   gt  gt  8     let b   rgbValue  amp  0xff     self init          red  CGFloat r    0xff          green  CGFloat g    0xff          blue  CGFloat b    0xff  alpha  1

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I made a small function placed it from where I can use it globally  amp  working fine with swift 2 1   func getColorFromHex rgbValue UInt32 - gt UIColor     let red   CGFloat  rgbValue  amp  0xFF0000   gt  gt  16  255 0    let green   CGFloat  rgbValue  amp  0xFF00   gt  gt  8  255 0    let blue   CGFloat rgbValue  amp  0xFF  255 0     return UIColor red red  green green  blue blue  alpha 1 0      usage   getColorFromHex 0xffffff

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You can use this extension on UIColor which converts Your String  Hexadecimal   RGBA  to UIColor and vice versa   extension UIColor        Convert RGBA String to UIColor object      rgbaString  must be separated by space  0 5 0 6 0 7 1 0  50  of Red 60  of Green 70  of Blue Alpha 100    public convenience init  rgbaString   String         self init ciColor  CIColor string  rgbaString            Convert UIColor to RGBA String   func toRGBAString  - gt  String       var r  CGFloat   0     var g  CGFloat   0     var b  CGFloat   0     var a  CGFloat   0     self getRed  amp r  green   amp g  blue   amp b  alpha   amp a      return    r    g    b    a            return UIColor from Hexadecimal Color string   public convenience init  hexString  String          let r  g  b  a  CGFloat      if hexString hasPrefix              let start   hexString index hexString startIndex  offsetBy  1        let hexColor   hexString substring from  start         if hexColor characters count    8           let scanner   Scanner string  hexColor          var hexNumber  UInt64   0          if scanner scanHexInt64  amp hexNumber              r   CGFloat  hexNumber  amp  0xff000000   gt  gt  24    255           g   CGFloat  hexNumber  amp  0x00ff0000   gt  gt  16    255           b   CGFloat  hexNumber  amp  0x0000ff00   gt  gt  8    255           a   CGFloat hexNumber  amp  0x000000ff    255           self init red  r  green  g  blue  b  alpha  a            return                              return nil           Convert UIColor to Hexadecimal String   func toHexString   - gt  String       var r  CGFloat   0     var g  CGFloat   0     var b  CGFloat   0     var a  CGFloat   0     self getRed  amp r  green   amp g  blue   amp b  alpha   amp a      return String          format    02X 02X 02X           Int r   0xff           Int g   0xff           Int b   0xff

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public static func hexStringToUIColor  hex String  - gt  UIColor       var cString String   hex trimmingCharacters in   whitespacesAndNewlines  uppercased        if  cString hasPrefix                 cString remove at  cString startIndex             if   cString characters count     6             var rgbValue UInt32   0         Scanner string  cString  scanHexInt32  amp rgbValue           return UIColor              red  CGFloat  rgbValue  amp  0xFF0000   gt  gt  16    255 0              green  CGFloat  rgbValue  amp  0x00FF00   gt  gt  8    255 0              blue  CGFloat rgbValue  amp  0x0000FF    255 0              alpha  CGFloat 1 0                 else if   cString characters count     8             var rgbValue UInt32   0         Scanner string  cString  scanHexInt32  amp rgbValue           return UIColor              red  CGFloat  rgbValue  amp  0x00FF0000   gt  gt  16    255 0              green  CGFloat  rgbValue  amp  0x0000FF00   gt  gt  8    255 0              blue  CGFloat rgbValue  amp  0x000000FF    255 0              alpha  CGFloat  rgbValue  amp  0xFF000000   gt  gt  24    255 0                else          return UIColor gray           How to use  var color  UIColor   hexStringToUIColor hex    00ff00       Without transparency var colorWithTransparency  UIColor   hexStringToUIColor hex    dd00ff00       With transparency

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Hex with validation     Based on Eduardo answer   Details   Xcode 10 0  Swift 4 2 Xcode 10 2 1  10E1001   Swift 5   Solution  import UIKit  extension UIColor        convenience init r  UInt8  g  UInt8  b  UInt8  alpha  CGFloat   1 0            let divider  CGFloat   255 0         self init red  CGFloat r  divider  green  CGFloat g  divider  blue  CGFloat b  divider  alpha  alpha             private convenience init rgbWithoutValidation value  Int32  alpha  CGFloat   1 0            self init              r  UInt8  value  amp  0xFF0000   gt  gt  16               g  UInt8  value  amp  0x00FF00   gt  gt  8               b  UInt8 value  amp  0x0000FF               alpha  alpha                      convenience init  rgb  Int32  alpha  CGFloat   1 0            if rgb  gt  0xFFFFFF    rgb  lt  0   return nil           self init rgbWithoutValidation  rgb  alpha  alpha             convenience init  hex  String  alpha  CGFloat   1 0            var charSet   CharacterSet whitespacesAndNewlines         charSet insert              let  hex   hex trimmingCharacters in  charSet          guard  hex range of     0-9A-Fa-f  6     options   regularExpression     nil else   return nil           var rgb  UInt32   0         Scanner string   hex  scanHexInt32  amp rgb          self init rgbWithoutValidation  Int32 rgb   alpha  alpha            Usage  let alpha  CGFloat   1 0     Hex print UIColor rgb  0x4F9BF5      nil   print UIColor rgb  0x4F9BF5  alpha  alpha      nil   print UIColor rgb  5217269      nil   print UIColor rgb  -5217269      nil                         nil print UIColor rgb  0xFFFFFF1      nil                        nil     String print UIColor hex   4F9BF5       nil   print UIColor hex   4F9BF5   alpha  alpha      nil   print UIColor hex    4F9BF5       nil   print UIColor hex    4F9BF5   alpha  alpha      nil   print UIColor hex    4F9BF56       nil                       nil print UIColor hex    blabla       nil                        nil     RGB print UIColor r  79  g  155  b  245   print UIColor r  79  g  155  b  245  alpha  alpha     print UIColor r  792  g  155  b  245  alpha  alpha       Compiler will throw an error  r g b    0   255

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I ve merged a few ideas from this thread of answers and updated it for iOS 13  amp  Swift 5  extension UIColor        convenience init   hex  String  alpha  CGFloat   1 0        var cString   hex trimmingCharacters in   whitespacesAndNewlines  uppercased            if cString hasPrefix  quot   quot     cString removeFirst              if cString count    6         self init  quot ff0000 quot      return red color for wrong hex input       return                var rgbValue  UInt64   0     Scanner string  cString  scanHexInt64  amp rgbValue           self init red  CGFloat  rgbValue  amp  0xFF0000   gt  gt  16    255 0                green  CGFloat  rgbValue  amp  0x00FF00   gt  gt  8    255 0                blue  CGFloat rgbValue  amp  0x0000FF    255 0                alpha  alpha          You can then use it like this  UIColor  quot  ff0000 quot      with   UIColor  quot ff0000 quot       without   UIColor  quot ff0000 quot   alpha  0 5     using optional alpha value

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Swift 5  Swift 4  Swift 3  UIColor extension   extension UIColor       convenience init hexString  String            let hex   hexString trimmingCharacters in  CharacterSet alphanumerics inverted          var int   UInt64           Scanner string  hex  scanHexInt64  amp int          let a  r  g  b  UInt64         switch hex count           case 3     RGB  12-bit               a  r  g  b     255   int  gt  gt  8    17   int  gt  gt  4  amp  0xF    17   int  amp  0xF    17          case 6     RGB  24-bit               a  r  g  b     255  int  gt  gt  16  int  gt  gt  8  amp  0xFF  int  amp  0xFF          case 8     ARGB  32-bit               a  r  g  b     int  gt  gt  24  int  gt  gt  16  amp  0xFF  int  gt  gt  8  amp  0xFF  int  amp  0xFF          default               a  r  g  b     255  0  0  0                    self init red  CGFloat r    255  green  CGFloat g    255  blue  CGFloat b    255  alpha  CGFloat a    255            Usage   let darkGrey   UIColor hexString    757575     Swift 2 x version   extension UIColor       convenience init hexString  String            let hex   hexString stringByTrimmingCharactersInSet NSCharacterSet alphanumericCharacterSet   invertedSet          var int   UInt32           NSScanner string  hex  scanHexInt  amp int          let a  r  g  b  UInt32         switch hex characters count           case 3     RGB  12-bit               a  r  g  b     255   int  gt  gt  8    17   int  gt  gt  4  amp  0xF    17   int  amp  0xF    17          case 6     RGB  24-bit               a  r  g  b     255  int  gt  gt  16  int  gt  gt  8  amp  0xFF  int  amp  0xFF          case 8     ARGB  32-bit               a  r  g  b     int  gt  gt  24  int  gt  gt  16  amp  0xFF  int  gt  gt  8  amp  0xFF  int  amp  0xFF          default               a  r  g  b     255  0  0  0                    self init red  CGFloat r    255  green  CGFloat g    255  blue  CGFloat b    255  alpha  CGFloat a    255

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This is a function that takes a hex string and returns a UIColor   You can enter hex strings with either format   ffffff or ffffff   Usage   var color1   hexStringToUIColor   d3d3d3     Swift 5   Swift 4    func hexStringToUIColor  hex String  - gt  UIColor       var cString String   hex trimmingCharacters in   whitespacesAndNewlines  uppercased        if  cString hasPrefix                 cString remove at  cString startIndex             if   cString count     6            return UIColor gray            var rgbValue UInt64   0     Scanner string  cString  scanHexInt64  amp rgbValue       return UIColor          red  CGFloat  rgbValue  amp  0xFF0000   gt  gt  16    255 0          green  CGFloat  rgbValue  amp  0x00FF00   gt  gt  8    255 0          blue  CGFloat rgbValue  amp  0x0000FF    255 0          alpha  CGFloat 1 0            Swift 3   func hexStringToUIColor  hex String  - gt  UIColor       var cString String   hex trimmingCharacters in   whitespacesAndNewlines  uppercased        if  cString hasPrefix                 cString remove at  cString startIndex             if   cString characters count     6            return UIColor gray            var rgbValue UInt32   0     Scanner string  cString  scanHexInt32  amp rgbValue       return UIColor          red  CGFloat  rgbValue  amp  0xFF0000   gt  gt  16    255 0          green  CGFloat  rgbValue  amp  0x00FF00   gt  gt  8    255 0          blue  CGFloat rgbValue  amp  0x0000FF    255 0          alpha  CGFloat 1 0            Swift 2   func hexStringToUIColor  hex String  - gt  UIColor       var cString String   hex stringByTrimmingCharactersInSet NSCharacterSet whitespaceAndNewlineCharacterSet   as NSCharacterSet  uppercaseString      if  cString hasPrefix               cString   cString substringFromIndex cString startIndex advancedBy 1              if   cString characters count     6          return UIColor grayColor              var rgbValue UInt32   0     NSScanner string  cString  scanHexInt  amp rgbValue       return UIColor          red  CGFloat  rgbValue  amp  0xFF0000   gt  gt  16    255 0          green  CGFloat  rgbValue  amp  0x00FF00   gt  gt  8    255 0          blue  CGFloat rgbValue  amp  0x0000FF    255 0          alpha  CGFloat 1 0                Source  arshad gist de147c42d7b3063ef7bc  Edit  Updated the code   Thanks  Hlung  jaytrixz  Ahmad F  Kegham K  and Adam Waite

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extension UIColor       public convenience init  hex  String            let r  g  b  a  CGFloat          if hex hasPrefix                    let start   hex index hex startIndex  offsetBy  1              let hexColor   String hex start                   if hexColor count    8                   let scanner   Scanner string  hexColor                  var hexNumber  UInt64   0                  if scanner scanHexInt64  amp hexNumber                        r   CGFloat  hexNumber  amp  0xff000000   gt  gt  24    255                     g   CGFloat  hexNumber  amp  0x00ff0000   gt  gt  16    255                     b   CGFloat  hexNumber  amp  0x0000ff00   gt  gt  8    255                     a   CGFloat hexNumber  amp  0x000000ff    255                      self init red  r  green  g  blue  b  alpha  a                      return                                                    return nil           Usage   let white   UIColor hex    ffffff

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Supporting 7 Hex color types  There are 7 hex color formats     FF0000   0xFF0000    FF0000    F00    red   0x00FF00   16711935  NSColorParser nsColor   FF0000  1   red nsColor NSColorParser nsColor  FF0  1   red nsColor NSColorParser nsColor  0xFF0000  1   red nsColor NSColorParser nsColor   FF0000  1   red nsColor NSColorParser nsColor  FF0000  1   red nsColor NSColorParser nsColor 0xFF0000 1   red nsColor NSColorParser nsColor 16711935 1   red nsColor   CAUTION  This isn t a  one-file-solution   there are some dependencies  but hunting them down may be faster than researching this from scratch    https   github com eonist swift-utils blob 2882002682c4d2a3dc7cb3045c45f66ed59d566d geom color NSColorParser swift  Permalink  https   github com eonist Element wiki Progress supporting-7-hex-color-types

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iOS 14  SwiftUI 2 0  swift 5 1  Xcode beta12 extension Color     static func hexColour hexValue UInt32 - gt Color             let red   Double  hexValue  amp  0xFF0000   gt  gt  16    255 0       let green   Double  hexValue  amp  0xFF00   gt  gt  8    255 0       let blue   Double hexValue  amp  0xFF    255 0       return Color red red  green green  blue blue           You call it with a hex number let red   Color hexColour hexValue  0xFF0000

[ios] How to use hex color values

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