UIColor from hex string (RGB or RGBA)

UIColor from hex.m

+ (UIColor *)colorWithHexString:(NSString *)hexWithAlphaString {
    UIColor *c = nil;
    unsigned long long rgbValue = 0;
    NSScanner *scanner = [NSScanner scannerWithString:hexWithAlphaString];
    [scanner setScanLocation:0]; // bypass '#' character
    [scanner scanHexLongLong:&rgbValue];
    
    if(hexWithAlphaString.length == 6)
    {
        c = [UIColor colorWithRed:((rgbValue & 0xFF0000) >> 16)/255.0 green:((rgbValue & 0xFF00) >> 8)/255.0 blue:(rgbValue & 0xFF)/255.0 alpha:1.0];
    }
    else if(hexWithAlphaString.length == 8)
    {
        c = [UIColor colorWithRed:((rgbValue & 0xFF000000) >> 24)/255.0 green:((rgbValue & 0xFF0000) >> 16)/255.0 blue:((rgbValue & 0xFF00) >> 8)/255.0 alpha:(rgbValue & 0xFF)/255.0];
    }

    return c;
}