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// 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)) | |
} |
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.
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)
}
}
@arvidurs Thanks 👍
thanks @arvidurs
@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.
nice work! @arvidurs
label.textColor = "#007aff".hexColor
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))
}
}
With Hexstring and Alpha separate.