IOS中将十进制色值转换成UIColor

最近因项目需要,在网上找了一些代码,整合了一下,实现的效果就是将10进制的RGB色值转换IOS用的UIColor,方法还有缺陷,有待改进

UIColor *getColorFromString(NSString *colorString)

{

    int colorInt=[colorString intValue];

    if(colorInt<)

        return [UIColor whiteColor];

    NSString *nLetterValue;

    NSString *colorString16 =@"";

    int ttmpig;

    for (int i = ; i<; i++)

    {

        ttmpig=colorInt%;

        colorInt=colorInt/;

        switch (ttmpig)

        {

            case :

                nLetterValue =@"A";break;

            case :

                nLetterValue =@"B";break;

            case :

                nLetterValue =@"C";break;

            case :

                nLetterValue =@"D";break;

            case :

                nLetterValue =@"E";break;

            case :

                nLetterValue =@"F";break;

            default:nLetterValue=[[NSString alloc]initWithFormat:@"%i",ttmpig];

        }

        colorString16 = [nLetterValue stringByAppendingString:colorString16];

        if (colorInt == )

            break;

    }

    colorString16 = [[colorString16 stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]] uppercaseString]; //去掉前后空格换行符

    // strip 0X if it appears

    if ([colorString16 hasPrefix:@"0X"])

        colorString16 = [colorString16 substringFromIndex:];

    if ([colorString16 hasPrefix:@"#"])

        colorString16 = [colorString16 substringFromIndex:];

    // String should be 6 or 8 characters

    if ([colorString16 length] < )

    {

        int cc=-[colorString16 length];

        for (int i=; i<cc; i++)

            colorString16=[@"" stringByAppendingString:colorString16];

    }

    if ([colorString16 length] != )

        return [UIColor whiteColor];

    // Separate into r, g, b substrings

    NSRange range;

    range.location = ;

    range.length = ;

    NSString *bString = [colorString16 substringWithRange:range];

    range.location = ;

    NSString *gString = [colorString16 substringWithRange:range];

    range.location = ;

    NSString *rString = [colorString16 substringWithRange:range];

    // Scan values

    unsigned int r, g, b;

    [[NSScanner scannerWithString:rString] scanHexInt:&r];  //扫描16进制到int

    [[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];

}