Created
March 27, 2015 02:45
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UIColor from hex code - Swift
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convenience init(rgba: String) { | |
var red: CGFloat = 0.0 | |
var green: CGFloat = 0.0 | |
var blue: CGFloat = 0.0 | |
var alpha: CGFloat = 1.0 | |
let formattedCode = rgba.stringByReplacingOccurrencesOfString("#", withString: "") | |
let formattedCodeLength = count(formattedCode) | |
if formattedCodeLength != 3 && formattedCodeLength != 4 && formattedCodeLength != 6 && formattedCodeLength != 8 { | |
fatalError("invalid color") | |
} | |
var hexValue: UInt32 = 0 | |
if NSScanner(string: formattedCode).scanHexInt(&hexValue) { | |
switch formattedCodeLength { | |
case 3: | |
red = CGFloat((hexValue & 0xF00) >> 8) / 15.0 | |
green = CGFloat((hexValue & 0x0F0) >> 4) / 15.0 | |
blue = CGFloat(hexValue & 0x00F) / 15.0 | |
case 4: | |
red = CGFloat((hexValue & 0xF000) >> 12) / 15.0 | |
green = CGFloat((hexValue & 0x0F00) >> 8) / 15.0 | |
blue = CGFloat((hexValue & 0x00F0) >> 4) / 15.0 | |
alpha = CGFloat(hexValue & 0x000F) / 15.0 | |
case 6: | |
red = CGFloat((hexValue & 0xFF0000) >> 16) / 255.0 | |
green = CGFloat((hexValue & 0x00FF00) >> 8) / 255.0 | |
blue = CGFloat(hexValue & 0x0000FF) / 255.0 | |
case 8: | |
red = CGFloat((hexValue & 0xFF000000) >> 24) / 255.0 | |
green = CGFloat((hexValue & 0x00FF0000) >> 16) / 255.0 | |
blue = CGFloat((hexValue & 0x0000FF00) >> 8) / 255.0 | |
alpha = CGFloat(hexValue & 0x000000FF) / 255.0 | |
default: | |
print("Invalid RGB string, number of characters after '#' should be either 3, 4, 6 or 8") | |
} | |
} | |
self.init(red:red, green:green, blue:blue, alpha:alpha) | |
} |
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