从16进制颜色值转换到RGB值（cocos2diphone版）

+ (ccColor3B)colorWithHexString: (NSString *) stringToConvert
{
    //去掉前后空格换行符
    NSString *cString = [[stringToConvert stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]] uppercaseString]; 
    
    if ([cString length] < 6) 
        return ccWHITE;
    
    if ([cString hasPrefix:@"0X"]) 
        cString = [cString substringFromIndex:2];
    else if ([cString hasPrefix:@"#"]) 
        cString = [cString substringFromIndex:1];
    
    if ([cString length] != 6) 
        return ccWHITE;
    
    // 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];
    
    unsigned int r, g, b;
    [[NSScanner scannerWithString:rString] scanHexInt:&r];  
    [[NSScanner scannerWithString:gString] scanHexInt:&g];
    [[NSScanner scannerWithString:bString] scanHexInt:&b];
    //NSLog(@"r = %u, g = %u, b = %u",r, g, b);
    return ccc3(r, g, b);
}