You can create a UIColor
from a hexadecimal number or string, e.g. 0xff00cc, “#FFFFFF”
Swift
Int Value
extension UIColor {
convenience init(hex: Int, alpha: CGFloat = 1.0) {
let r = CGFloat((hex >> 16) & 0xff) / 255
let g = CGFloat((hex >> 08) & 0xff) / 255
let b = CGFloat((hex >> 00) & 0xff) / 255
self.init(red: r, green: g, blue: b, alpha: alpha)
}
}
Example:
let color = UIColor(hex: 0xff00cc, alpha: 1.0)
Note that for alpha
the default value of 1.0
is provided, so it can be used as follows:
let color = UIColor(hex: 0xff00cc)
String Value
extension UIColor {
convenience init(hexCode: String) {
let hex = hexCode.stringByTrimmingCharactersInSet(NSCharacterSet.alphanumericCharacterSet().invertedSet)
var int = UInt32()
NSScanner(string: hex).scanHexInt(&int)
let a, r, g, b: UInt32
switch hex.characters.count {
case 3:
(a, r, g, b) = (255, (int >> 8) * 17, (int >> 4 & 0xF) * 17, (int & 0xF) * 17)
case 6:
(a, r, g, b) = (255, int >> 16, int >> 8 & 0xFF, int & 0xFF)
case 8:
(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)
}
}
Example Usage:
Hex with alpha
let color = UIColor("#80FFFFFF")
Hex with no alpha (color
alpha will equal 1.0)
let color = UIColor("#FFFFFF")
let color = UIColor("#FFF")
Objective-C
Int Value
@interface UIColor (Hex)
+ (UIColor *)colorWithHex:(NSUInteger)hex alpha:(CGFloat)alpha;
@end
@implementation UIColor (Hex)
+ (UIColor *)colorWithHex:(NSUInteger)hex alpha:(CGFloat)alpha {
return [UIColor colorWithRed:((CGFloat)((hex & 0xFF0000) >> 16))/255.0
green:((CGFloat)((hex & 0xFF00) >> 8))/255.0
blue:((CGFloat)(hex & 0xFF))/255.0
alpha:alpha];
}
@end
Example: