Simple category method to construct a UIColor object from a hex string.

UIColor+UUColorCreation.h

@interface UIColor (UUColorCreation)

+ (UIColor*) uuColorFromHex:(NSString*)color;

@end

UIColor+UUColorCreation.m

@implementation UIColor (UUColorCreation)

+ (UIColor*) uuColorFromHex:(NSString*)color
{
    CGFloat rgba[4] = {0, 0, 0, 1};
    
    if (color && (color.length == 6 || color.length == 8))
    {
        for (int i = 0; i < color.length; i += 2)
        {
            NSScanner* sc = [NSScanner scannerWithString:(NSString*)[color substringWithRange:NSMakeRange(i, 2)]];
            unsigned int hex = 0;
            [sc scanHexInt:&hex];
            rgba[i/2] = (hex / 255.0f);
        }
    }
    
    UIColor* c = [UIColor colorWithRed:rgba[0] green:rgba[1] blue:rgba[2] alpha:rgba[3]];
    return c;
}

@end