1 + (UIColor *)colorWithHexStr:(NSString *)hexString {
2 NSString *colorString = [[hexString stringByReplacingOccurrencesOfString:@"#" withString:@""] uppercaseString];
3 CGFloat alpha, red, blue, green;
4 switch ([colorString length]) {
5 case 3: // #RGB
6 alpha = 1.0f;
7 red = [self colorComponentFrom: colorString start: 0 length: 1];
8 green = [self colorComponentFrom: colorString start: 1 length: 1];
9 blue = [self colorComponentFrom: colorString start: 2 length: 1];
10 break;
11 case 4: // #ARGB
12 alpha = [self colorComponentFrom: colorString start: 0 length: 1];
13 red = [self colorComponentFrom: colorString start: 1 length: 1];
14 green = [self colorComponentFrom: colorString start: 2 length: 1];
15 blue = [self colorComponentFrom: colorString start: 3 length: 1];
16 break;
17 case 6: // #RRGGBB
18 alpha = 1.0f;
19 red = [self colorComponentFrom: colorString start: 0 length: 2];
20 green = [self colorComponentFrom: colorString start: 2 length: 2];
21 blue = [self colorComponentFrom: colorString start: 4 length: 2];
22 break;
23 case 8: // #AARRGGBB
24 alpha = [self colorComponentFrom: colorString start: 0 length: 2];
25 red = [self colorComponentFrom: colorString start: 2 length: 2];
26 green = [self colorComponentFrom: colorString start: 4 length: 2];
27 blue = [self colorComponentFrom: colorString start: 6 length: 2];
28 break;
29 default:
30 return nil;
31 break;
32 }
33 return [UIColor colorWithRed:red green:green blue:blue alpha:alpha];
34 }
35
36 + (CGFloat)colorComponentFrom:(NSString *)string start:(NSUInteger)start length:(NSUInteger)length {
37 NSString *substring = [string substringWithRange: NSMakeRange(start, length)];
38 NSString *fullHex = length == 2 ? substring : [NSString stringWithFormat: @"%@%@", substring, substring];
39 unsigned hexComponent;
40 [[NSScanner scannerWithString: fullHex] scanHexInt: &hexComponent];
41 return hexComponent / 255.0;
42 }
