Example
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:
UIColor *color = [UIColor colorWithHex:0xff00cc alpha:1.0];
String Value
- (UIColor*) hex:(NSString*)hexCode {
NSString *noHashString = [hexCode stringByReplacingOccurrencesOfString:@"#" withString:@""];
NSScanner *scanner = [NSScanner scannerWithString:noHashString];
[scanner setCharactersToBeSkipped:[NSCharacterSet symbolCharacterSet]];
unsigned hex;
if (![scanner scanHexInt:&hex]) return nil;
int a;
int r;
int g;
int b;
switch (noHashString.length) {
case 3:
a = 255;
r = (hex >> 8) * 17;
g = ((hex >> 4) & 0xF) * 17;
b = ((hex >> 0) & 0xF) * 17;
break;
case 6:
a = 255;
r = (hex >> 16);
g = (hex >> 8) & 0xFF;
b = (hex) & 0xFF;
break;
case 8:
a = (hex >> 24);
r = (hex >> 16) & 0xFF;
g = (hex >> 8) & 0xFF;
b = (hex) & 0xFF;
break;
default:
a = 255.0;
r = 255.0;
b = 255.0;
g = 255.0;
break;
}
return [UIColor colorWithRed:r / 255.0f green:g / 255.0f blue:b / 255.0f alpha:a / 255];
}
Example usage:
Hex with alpha
UIColor* color = [self hex:@"#80FFFFFF"];
Hex with no alpha (color alpha will equal 1)
UIColor* color = [self hex:@"#FFFFFF"];
UIColor* color = [self hex:@"#FFF"];
