shadcn/gist:de147c42d7b3063ef7bc

ghost · 2014-07-25T13:39:10Z

I'd probably make the return value an optional and return nil rather than a grey color if the string isn't right. Only because that's easier to check for, after all you might want a shade of grey ;)

ghost · 2014-07-25T13:54:55Z

Also, for example, I think you should be writing it like this

if (cString.hasPrefix("#"))
{
cString = cString.substringFromIndex(advance(cString.startIndex, 1))
}

ghost · 2014-07-25T14:35:45Z

Also for some reason I don't know I had to pass the arguments as NSNumbers I know you get the bridging for free, but in Beta 4 it seems to be a requirement. On UIColor

shadcn · 2014-07-26T15:56:33Z

Code updated. Thanks @YannisBelessiotis.

barrault01 · 2014-08-10T21:31:43Z

I update the code to make it work with xcode 6 beta 5.

mahi008 · 2014-09-03T19:16:11Z

Well it looks like you have to update it again, because of this error "String.Index' does not conform protocol 'IntegerLiteralConvertible' " on Xcode 6 Beta7

lukaskollmer · 2014-10-29T07:05:24Z

Please update the code, it does not work:

 "String.Index' does not conform protocol 'IntegerLiteralConvertible'

kylelol · 2014-10-29T16:17:13Z

I got it working in Xcode 6.1, here are my changes

func colorWithHexString (hex:String) -> UIColor {
        var cString:String = hex.stringByTrimmingCharactersInSet(NSCharacterSet.whitespaceAndNewlineCharacterSet()).uppercaseString

        if (cString.hasPrefix("#")) {
            cString = (cString as NSString).substringFromIndex(1)
        }

        if (countElements(cString) != 6) {
            return UIColor.grayColor()
        }

        var rString = (cString as NSString).substringToIndex(2)
        var gString = ((cString as NSString).substringFromIndex(2) as NSString).substringToIndex(2)
        var bString = ((cString as NSString).substringFromIndex(4) as NSString).substringToIndex(2)

        var r:CUnsignedInt = 0, g:CUnsignedInt = 0, b:CUnsignedInt = 0;
        NSScanner(string: rString).scanHexInt(&r)
        NSScanner(string: gString).scanHexInt(&g)
        NSScanner(string: bString).scanHexInt(&b)


        return UIColor(red: CGFloat(r) / 255.0, green: CGFloat(g) / 255.0, blue: CGFloat(b) / 255.0, alpha: CGFloat(1))
    }

mehawk · 2014-11-19T02:42:26Z

func colorWithHexString (hex:String) -> UIColor {
    var cString:String = hex.stringByTrimmingCharactersInSet(NSCharacterSet.whitespaceAndNewlineCharacterSet() as NSCharacterSet).uppercaseString

    if (cString.hasPrefix("#")) {
        cString = cString.substringFromIndex(advance(cString.startIndex, 1))
    }

    if (countElements(cString) != 6) {
        return UIColor.grayColor()
    }

    var rgbValue:UInt32 = 0
    NSScanner(string: cString).scanHexInt(&rgbValue)

    return UIColor(
        red: CGFloat((rgbValue & 0xFF0000) >> 16) / 255.0,
        green: CGFloat((rgbValue & 0x00FF00) >> 8) / 255.0,
        blue: CGFloat(rgbValue & 0x0000FF) / 255.0,
        alpha: CGFloat(1.0)
    )
}

harlanhaskins · 2015-04-14T18:46:34Z

convenience init(hex: String) {
    let characterSet = NSCharacterSet.whitespaceAndNewlineCharacterSet().mutableCopy() as! NSMutableCharacterSet
    characterSet.formUnionWithCharacterSet(NSCharacterSet(charactersInString: "#"))
    var cString = hex.stringByTrimmingCharactersInSet(characterSet).uppercaseString
    if (count(cString) != 6) {
        self.init(white: 1.0, alpha: 1.0)
    } else {
        var rgbValue: UInt32 = 0
        NSScanner(string: cString).scanHexInt(&rgbValue)

        self.init(red: CGFloat((rgbValue & 0xFF0000) >> 16) / 255.0,
            green: CGFloat((rgbValue & 0x00FF00) >> 8) / 255.0,
            blue: CGFloat(rgbValue & 0x0000FF) / 255.0,
            alpha: CGFloat(1.0))
    }
}

nabs-m · 2015-07-07T00:04:45Z

For Xcode 7 & Swift 2.0

func colorWithHexString (hex:String) -> 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(&r)
    NSScanner(string: gString).scanHexInt(&g)
    NSScanner(string: bString).scanHexInt(&b)


    return UIColor(red: CGFloat(r) / 255.0, green: CGFloat(g) / 255.0, blue: CGFloat(b) / 255.0, alpha: CGFloat(1))
}

amywtlin · 2015-07-19T08:59:20Z

Thanks @arshad and @nabilmaad. The one updated for Swift 2.0 works fine for me, except the if character count statement.

blixt · 2015-09-30T00:50:33Z

Consider parsing the entire hex string at once, as well as supporting short hex colors and ARGB:

import UIKit

extension String {
    var hexColor: UIColor {
        let hex = self.stringByTrimmingCharactersInSet(NSCharacterSet.alphanumericCharacterSet().invertedSet)
        var int = UInt32()
        NSScanner(string: hex).scanHexInt(&int)
        let a, r, g, b: UInt32
        switch hex.characters.count {
        case 3: // RGB (12-bit)
            (a, r, g, b) = (255, (int >> 8) * 17, (int >> 4 & 0xF) * 17, (int & 0xF) * 17)
        case 6: // RGB (24-bit)
            (a, r, g, b) = (255, int >> 16, int >> 8 & 0xFF, int & 0xFF)
        case 8: // ARGB (32-bit)
            (a, r, g, b) = (int >> 24, int >> 16 & 0xFF, int >> 8 & 0xFF, int & 0xFF)
        default:
            return UIColor.clearColor()
        }
        return UIColor(red: CGFloat(r) / 255, green: CGFloat(g) / 255, blue: CGFloat(b) / 255, alpha: CGFloat(a) / 255)
    }
}

"#f00".hexColor       // r 1.0 g 0.0 b 0.0 a 1.0
"#be1337".hexColor    // r 0.745 g 0.075 b 0.216 a 1.0
"#12345678".hexColor  // r 0.204 g 0.337 b 0.471 a 0.071

blixt · 2015-09-30T01:10:27Z

It can also be a good idea to make the result nillable, so that the caller can determine whether parsing failed, or if the string was actually the color you defaulted to: https://gist.github.com/blixt/821a0748257dc8d3581f

jorgecasariego · 2015-10-23T21:08:06Z

Thanks @nabilmaad

lucatorella · 2015-10-28T17:14:36Z

UIColor extension. Xcode 7 & Swift 2

extension UIColor {
    convenience init(hexString: String) {
        let hex = hexString.stringByTrimmingCharactersInSet(NSCharacterSet.alphanumericCharacterSet().invertedSet)
        var int = UInt32()
        NSScanner(string: hex).scanHexInt(&int)
        let a, r, g, b: UInt32
        switch hex.characters.count {
        case 3: // RGB (12-bit)
            (a, r, g, b) = (255, (int >> 8) * 17, (int >> 4 & 0xF) * 17, (int & 0xF) * 17)
        case 6: // RGB (24-bit)
            (a, r, g, b) = (255, int >> 16, int >> 8 & 0xFF, int & 0xFF)
        case 8: // ARGB (32-bit)
            (a, r, g, b) = (int >> 24, int >> 16 & 0xFF, int >> 8 & 0xFF, int & 0xFF)
        default:
            (a, r, g, b) = (1, 1, 1, 0)
        }
        self.init(red: CGFloat(r) / 255, green: CGFloat(g) / 255, blue: CGFloat(b) / 255, alpha: CGFloat(a) / 255)
    }
}

jeffery812 · 2015-11-12T10:19:05Z

thanks @nabilmaad, @blixt ,@lucatorella, they work very well

mertnesvat · 2016-01-07T13:46:16Z

@lucotorella 👍

ZebTheWizard · 2016-02-19T02:28:23Z

This worked perfectly for NSColor Swift 2:

func colorWithHexString (hex:String) -> NSColor {
        var cString:String = hex.stringByTrimmingCharactersInSet(NSCharacterSet.whitespaceAndNewlineCharacterSet()).uppercaseString

        if cString.hasPrefix("#") {
            cString = (cString as NSString).substringFromIndex(1)
        }

        if cString.characters.count != 6 {
            return NSColor.grayColor()
        }

        var rgbValue : UInt32 = 0
        NSScanner(string: cString).scanHexInt(&rgbValue)

        return NSColor(
            red: CGFloat((rgbValue & 0xFF0000) >> 16) / 255.0,
            green: CGFloat((rgbValue & 0x00FF00) >> 8) / 255.0,
            blue: CGFloat(rgbValue & 0x0000FF) / 255.0,
            alpha: CGFloat(1.0)
        )
    }

skywinder · 2016-03-25T12:19:28Z

Update version for Swift 2:

extension UIColor {
// Creates a UIColor from a Hex string.
    convenience init(hexString: String) {
        var cString: String = hexString.stringByTrimmingCharactersInSet(NSCharacterSet.whitespaceAndNewlineCharacterSet()).uppercaseString

        if (cString.hasPrefix("#")) {
            cString = (cString as NSString).substringFromIndex(1)
        }

        if (cString.characters.count != 6) {
            self.init(white: 0.5, alpha: 1.0)
        } else {
            let rString: String = (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(&r)
            NSScanner(string: gString).scanHexInt(&g)
            NSScanner(string: bString).scanHexInt(&b)

            self.init(red: CGFloat(r) / CGFloat(255.0), green: CGFloat(g) / CGFloat(255.0), blue: CGFloat(b) / CGFloat(255.0), alpha: CGFloat(1))
        }


    }
}

vitorspencer · 2016-05-11T15:39:45Z

Thanks guys, you just saved me quite some work! 👍

imsoda · 2016-05-18T04:03:45Z

Thanks!

StallionV · 2016-05-18T04:42:33Z

With Hexstring and Alpha separate.

extension UIColor {
    convenience init(hexString: String, alpha: Double = 1.0) {
        let hex = hexString.stringByTrimmingCharactersInSet(NSCharacterSet.alphanumericCharacterSet().invertedSet)
        var int = UInt32()
        NSScanner(string: hex).scanHexInt(&int)
        let r, g, b: UInt32
        switch hex.characters.count {
        case 3: // RGB (12-bit)
            (r, g, b) = ((int >> 8) * 17, (int >> 4 & 0xF) * 17, (int & 0xF) * 17)
        case 6: // RGB (24-bit)
            (r, g, b) = (int >> 16, int >> 8 & 0xFF, int & 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)
    }
}

UIColor.init(hexString: "000000", alpha: 0.5) // r 0.0 g 0.0 b 0.0 a 0.5
UIColor.init(hexString: "#fff", alpha: 0.2) // r 1.0 g 1.0 b 1.0 a 0.2
UIColor.init(hexString: "00ff00", alpha: 1.0) // r 0.0 g 1.0 b 0.0 a 1.0
UIColor.init(hexString: "0000ff") // r 0.0 g 0.0 b 1.0 a 1.0 with alpha optional which defaults to 1

raymond-liao · 2016-08-12T02:56:47Z

I've made another UIColor extension in Swift 2.2, wish to help some one:

extension UIColor {
convenience init(hex: Int, alpha: Double = 1.0) {
self.init(red: CGFloat((hex>>16)&0xFF)/255.0, green: CGFloat((hex>>8)&0xFF)/255.0, blue: CGFloat((hex)&0xFF)/255.0, alpha: CGFloat(255 * alpha) / 255)
}
}

Sample to use:
UIColor(hex: 0xffffff) // r 1.0 g 1.0 b 1.0 a 1.0
UIColor(hex: 0xffffff, alpha: 0.5) // r 1.0 g 1.0 b 1.0 a 0.5

p.s.: Sorry for the abnormal code format, the 'Insert code' function is not good for me.

arvidurs · 2016-08-16T22:47:39Z

For Swift 3.0

extension String {
    var hexColor: UIColor {        
        let hex = trimmingCharacters(in: CharacterSet.alphanumerics.inverted)
        var int = UInt32()       
        Scanner(string: hex).scanHexInt32(&int)
        let a, r, g, b: UInt32
        switch hex.characters.count {
        case 3: // RGB (12-bit)
            (a, r, g, b) = (255, (int >> 8) * 17, (int >> 4 & 0xF) * 17, (int & 0xF) * 17)
        case 6: // RGB (24-bit)
            (a, r, g, b) = (255, int >> 16, int >> 8 & 0xFF, int & 0xFF)
        case 8: // ARGB (32-bit)
            (a, r, g, b) = (int >> 24, int >> 16 & 0xFF, int >> 8 & 0xFF, int & 0xFF)
        default:
            return .clear
        }
        return UIColor(red: CGFloat(r) / 255, green: CGFloat(g) / 255, blue: CGFloat(b) / 255, alpha: CGFloat(a) / 255)
    }
}

cppcho · 2016-08-17T08:54:14Z

@arvidurs Thanks 👍

muruganandham · 2016-10-17T11:03:33Z

thanks @arvidurs

realAbstractionist · 2017-04-26T08:33:06Z

@arvidurs Really helped!
Just wanna add that you have to put this code outside of any class. Otherwise you are probably going to get an exception.

CocoaDebug · 2018-03-24T10:38:54Z

nice work! @arvidurs

label.textColor = "#007aff".hexColor

CaptainFarrell · 2018-09-04T02:02:34Z

in swift 4.0

convenience init(hex: String)
{
let characterSet = NSCharacterSet.whitespacesAndNewlines as! NSMutableCharacterSet
characterSet.formUnion(with: NSCharacterSet.init(charactersIn: "#") as CharacterSet)
let cString = hex.trimmingCharacters(in: characterSet as CharacterSet).uppercased()
if (cString.count != 6) {
self.init(white: 1.0, alpha: 1.0)
} else {
var rgbValue: UInt32 = 0
Scanner(string: cString).scanHexInt32(&rgbValue)

        self.init(red: CGFloat((rgbValue & 0xFF0000) >> 16) / 255.0,
                  green: CGFloat((rgbValue & 0x00FF00) >> 8) / 255.0,
                  blue: CGFloat(rgbValue & 0x0000FF) / 255.0,
                  alpha: CGFloat(1.0))
    }
}

	// Creates a UIColor from a Hex string.
	func colorWithHexString (hex:String) -> UIColor {
	var cString:String = hex.stringByTrimmingCharactersInSet(NSCharacterSet.whitespaceAndNewlineCharacterSet()).uppercaseString

	if (cString.hasPrefix("#")) {
	cString = cString.substringFromIndex(1)
	}

	if (countElements(cString) != 6) {
	return UIColor.grayColor()
	}

	var rString = cString.substringToIndex(2)
	var gString = cString.substringFromIndex(2).substringToIndex(2)
	var bString = cString.substringFromIndex(4).substringToIndex(2)

	var r:CUnsignedInt = 0, g:CUnsignedInt = 0, b:CUnsignedInt = 0;
	NSScanner.scannerWithString(rString).scanHexInt(&r)
	NSScanner.scannerWithString(gString).scanHexInt(&g)
	NSScanner.scannerWithString(bString).scanHexInt(&b)

	return UIColor(red: Float(r) / 255.0, green: Float(g) / 255.0, blue: Float(b) / 255.0, alpha: Float(1))
	}

shadcn/gist:de147c42d7b3063ef7bc

ghost commented Jul 25, 2014

ghost commented Jul 25, 2014

ghost commented Jul 25, 2014

shadcn commented Jul 26, 2014

barrault01 commented Aug 10, 2014

mahi008 commented Sep 3, 2014

lukaskollmer commented Oct 29, 2014

kylelol commented Oct 29, 2014

mehawk commented Nov 19, 2014

harlanhaskins commented Apr 14, 2015

nabs-m commented Jul 7, 2015

amywtlin commented Jul 19, 2015

blixt commented Sep 30, 2015

blixt commented Sep 30, 2015

jorgecasariego commented Oct 23, 2015

lucatorella commented Oct 28, 2015

jeffery812 commented Nov 12, 2015

mertnesvat commented Jan 7, 2016

ZebTheWizard commented Feb 19, 2016

skywinder commented Mar 25, 2016

vitorspencer commented May 11, 2016

imsoda commented May 18, 2016

StallionV commented May 18, 2016 •

edited

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raymond-liao commented Aug 12, 2016 •

edited

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arvidurs commented Aug 16, 2016

cppcho commented Aug 17, 2016

muruganandham commented Oct 17, 2016

realAbstractionist commented Apr 26, 2017

CocoaDebug commented Mar 24, 2018

CaptainFarrell commented Sep 4, 2018

shadcn/gist:de147c42d7b3063ef7bc

ghost commented Jul 25, 2014

ghost commented Jul 25, 2014

ghost commented Jul 25, 2014

shadcn commented Jul 26, 2014

barrault01 commented Aug 10, 2014

mahi008 commented Sep 3, 2014

lukaskollmer commented Oct 29, 2014

kylelol commented Oct 29, 2014

mehawk commented Nov 19, 2014

harlanhaskins commented Apr 14, 2015

nabs-m commented Jul 7, 2015

amywtlin commented Jul 19, 2015

blixt commented Sep 30, 2015

blixt commented Sep 30, 2015

jorgecasariego commented Oct 23, 2015

lucatorella commented Oct 28, 2015

jeffery812 commented Nov 12, 2015

mertnesvat commented Jan 7, 2016

ZebTheWizard commented Feb 19, 2016

skywinder commented Mar 25, 2016

vitorspencer commented May 11, 2016

imsoda commented May 18, 2016

StallionV commented May 18, 2016 • edited Loading

raymond-liao commented Aug 12, 2016 • edited Loading

arvidurs commented Aug 16, 2016

cppcho commented Aug 17, 2016

muruganandham commented Oct 17, 2016

realAbstractionist commented Apr 26, 2017

CocoaDebug commented Mar 24, 2018

CaptainFarrell commented Sep 4, 2018

StallionV commented May 18, 2016 •

edited

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raymond-liao commented Aug 12, 2016 •

edited

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