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];
}