gistfile1.m

+ (UIColor *)colorFromString:(NSString *)string
{
    if (![string isKindOfClass:[NSString class]] && (string.length != 3 || string.length != 6 || string.length != 8))
        return [UIColor USPGrayColour];
    
    if (string.length == 3)
    {
        NSMutableString *str = [NSMutableString new];
        for(int i =0 ;i<[string length]; i++)
        {
            char character = [string characterAtIndex:i];
            [str appendFormat:@"%c%c",character,character];
        }
        string = [NSString stringWithString:str];
    }
    
    if (string.length == 6)
    {
        string = [string stringByAppendingString:@"FF"];
    }
    
    string = [string uppercaseString];
    
    NSScanner *scanner = [NSScanner scannerWithString:string];
    
    uint32_t rgba;
    
    [scanner scanHexInt:&rgba];
    
    CGFloat red     = ((rgba & 0xFF000000) >> 24) / 255.0f;
    CGFloat green   = ((rgba & 0x00FF0000) >> 16) / 255.0f;
    CGFloat blue    = ((rgba & 0x0000FF00) >> 8) / 255.0f;
    CGFloat alpha   =  (rgba & 0x000000FF) / 255.0f;
    
    return [UIColor colorWithRed:red green:green blue:blue alpha:alpha];
}