How can I use UIColorFromRGB in Swift

Question

In Objective-C  we use this code to set RGB color codes for views    define UIColorFromRGB rgbValue           UIColor colorWithRed   float   rgbValue  amp  0xFF0000   gt  gt  16   255 0 green   float   rgbValue  amp  0xFF00   gt  gt  8   255 0 blue   float  rgbValue  amp  0xFF   255 0 alpha 1 0   view backgroundColor UIColorFromRGB 0x209624     How can I use this in Swift

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In Swift3  if you are starting with a color you have already chosen  you can get the RGB value online  http   imagecolorpicker com  and use those values defined as a UIColor   This solution implements them as a background        IBAction func blueBackground   sender  Any            let blueColor   UIColor red  CGFloat 160 255   green  CGFloat 183 0 255   blue  CGFloat 227 0 255   alpha  1          view backgroundColor   blueColor    Vadym mentioned this above in the comments and it is important to define the CGFloat with a single decimal point

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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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That can be simply done by using this initialization  view backgroundColor   UIColor hex   067AB5

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adding a swift 3 option   cell layer borderColor   UIColor  red  192 0 255 0  green  192 0 255 0  blue  197 255 0  alpha  1 0  cgColor

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Nate Cook s answer is absolutely correct  Just for greater flexibility  I keep the following functions in my pack   func getUIColorFromRGBThreeIntegers red  Int  green  Int  blue  Int  - gt  UIColor       return UIColor red  CGFloat Float red    255 0           green  CGFloat Float green    255 0           blue  CGFloat Float blue    255 0           alpha  CGFloat 1 0      func getUIColorFromRGBHexValue value  Int  - gt  UIColor       return getUIColorFromRGBThreeIntegers red   value  amp  0xFF0000   gt  gt  16          green   value  amp  0x00FF00   gt  gt  8          blue  value  amp  0x0000FF     func getUIColorFromRGBString value  String  - gt  UIColor       let str   value lowercased   replacingOccurrences of       with               replacingOccurrences of   0x   with               return getUIColorFromRGBHexValue value  Int str  radix  16         And this is how I use them      All three of them are identical  let myColor1   getUIColorFromRGBHexValue value  0xd5a637  let myColor2   getUIColorFromRGBString value    D5A637   let myColor3   getUIColorFromRGBThreeIntegers red  213  green  166  blue  55    Hope this will help  Everything is tested with Swift 3 Xcode 8

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For Xcode 9  use UIColor with RGB values   shareBtn backgroundColor   UIColor  red  CGFloat 92 255 0   green  CGFloat 203 255 0   blue  CGFloat 207 255 0   alpha  CGFloat 1 0      Preview     See additional Apple documentation on UIColor

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UIColorFromRGB in Swift 4 button layer backgroundColor   UIColor red  112 0 255  green  86 0 255  blue  164 0 255  alpha  1 0  cgColor

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myLabel backgroundColor   UIColor red  50 0 255  green  150 0 255  blue  65 0 255  alpha  1 0

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You can use this     The color RGB  85CC4B let newColor   UIColor red  CGFloat 0x85  255                        green  CGFloat 0xCC  255                        blue  CGFloat 0x4B  255                        alpha  1 0

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solution for argb format       UIColorExtensions swift import UIKit extension UIColor        convenience init argb  UInt            self init              red  CGFloat  argb  amp  0xFF0000   gt  gt  16    255 0              green  CGFloat  argb  amp  0x00FF00   gt  gt  8    255 0              blue  CGFloat argb  amp  0x0000FF    255 0              alpha  CGFloat  argb  amp  0xFF000000   gt  gt  24    255 0                     usage   var clearColor  UIColor   UIColor init argb  0x00000000  var redColor  UIColor   UIColor init argb  0xFFFF0000

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If you re starting from a string  not hex  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 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 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 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

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Here s a Swift version of that function  for getting a UIColor representation of a UInt value    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           view backgroundColor   UIColorFromRGB 0x209624

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You cannot use a complex macros like  define UIColorFromRGB rgbValue  in swift  The replacement of simple macro in swift is global constants like     let FADE ANIMATION DURATION   0 35   Still the complex macros that accept parameters are not supported by swift  you could use functions instead       Complex macros are used in C and Objective-C but have no counterpart in Swift  Complex macros are macros that do not define constants  including parenthesized  function-like macros  You use complex macros in C and Objective-C to avoid type-checking constraints or to avoid retyping large amounts of boilerplate code  However  macros can make debugging and refactoring difficult  In Swift  you can use functions and generics to achieve the same results without any compromises  Therefore  the complex macros that are in C and Objective-C source files are not made available to your Swift code    Excerpt from Using swift with cocoa and objective C  Check  Nate Cooks answer for the Swift version of that function to be used here

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I really liked Nate Cook s answer but I wanted something a little more idiomatic  I believe this is a really good use case for a convenience initializer via a custom extension      UIColorExtensions swift import Foundation import UIKit  extension UIColor       convenience init rgb  UInt            self init              red  CGFloat  rgb  amp  0xFF0000   gt  gt  16    255 0              green  CGFloat  rgb  amp  0x00FF00   gt  gt  8    255 0              blue  CGFloat rgb  amp  0x0000FF    255 0              alpha  CGFloat 1 0                      This can now be used like so   view backgroundColor   UIColor rgb  0x209624    I would only recommend monkey patching UIKit classes like this in your own client code  not libraries

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I have used the following in swift   let appRedColor   UIColor red  200 0 255 0  green  16 0 255 0  blue  46 0 255 0  alpha  1 0  let appSilverColor   UIColor red  236 0 255 0  green  236 0 255 0  blue  236 0 255 0  alpha  1 0  let appWhiteColor   UIColor red  255 0 255 0  green  255 0 255 0  blue  255 0 255 0  alpha  1 0  let appNavyColor   UIColor red  19 0 255 0  green  41 0 255 0  blue  75 0 255 0  alpha  1 0

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This is worked for me in swift  Try this  bottomBorder borderColor   UIColor  red  255 0 255 0  green  215 0 255 0  blue  60 255 0  alpha  1 0  CGColor

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import Cocoa class ViewController  NSViewController       override func viewDidLoad                 super viewDidLoad       self view wantsLayer   true     self view layer  backgroundColor   NSColor hexString    4d9b48   cgColor    extension NSColor                convenience init hexString  String  alpha  CGFloat   1 0                      let hexString  String   hexString trimmingCharacters in  CharacterSet whitespacesAndNewlines                    let scanner   Scanner string  hexString                    if  hexString hasPrefix                               scanner scanLocation   1                                       var color  UInt32   0                   scanner scanHexInt32  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 alpha                                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 String format    06x   rgb

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I wanted to put     cell backgroundColor   UIColor colorWithRed 125 255 0  green  125 255 0  blue  125 255 0  alpha  1 0      but that didn t work    So I used  For Swift  cell backgroundColor   UIColor red  0 5  green  0 5  blue  0 5  alpha  1 0      So this is the workaround that I found

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This is a nice extension for UIColor  You can use enum values hex  string   and direct string values when you creating UIColor objects   The extension we deserve https   github com ioramashvili UsefulExtensions blob master Extensions playground Pages UIColor xcplaygroundpage Contents swift

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I can see its already been answered  but still hope one liner will help in better way   import UIKit  let requiredColor   UIColor red  CGFloat  rgbValue  amp  0xFF0000   gt  gt  16  255                               green  CGFloat  rgbValue  amp  0x00FF00   gt  gt  8  255                               blue  CGFloat rgbValue  amp  0x0000FF  255  alpha  1    Updated   Changes done as per example explained by Author of question to provide hex values

[ios] How can I use UIColorFromRGB in Swift?

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