iOS開發中16進位顏色(html顏色值)字串轉為UIColor

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//16進位顏色(html顏色值)字串轉為UIColor+(UIColor *) hexStringToColor: (NSString *) stringToConvert{     NSString *cString = [[stringToConvert stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]] uppercaseString];     // String should be 6 or 8 charactersif ([cString length] < 6) return [UIColor blackColor];     // strip 0X if it appearsif ([cString hasPrefix:@"0X"]) cString = [cString substringFromIndex:2];     if ([cString hasPrefix:@"#"]) cString = [cString substringFromIndex:1];     if ([cString length] != 6) return [UIColor blackColor];     // Separate into r, g, b substrings     NSRange range;     range.location = 0;     range.length = 2;     NSString *rString = [cString substringWithRange:range];     range.location = 2;     NSString *gString = [cString substringWithRange:range];     range.location = 4;     NSString *bString = [cString substringWithRange:range];     // Scan values     unsigned int r, g, b;     [[NSScanner scannerWithString:rString] scanHexInt:&r];     [[NSScanner scannerWithString:gString] scanHexInt:&g];     [[NSScanner scannerWithString:bString] scanHexInt:&b];     return [UIColor colorWithRed:((float) r / 255.0f)                                 green:((float) g / 255.0f)                                   blue:((float) b / 255.0f)                                 alpha:1.0f];}