Objective-C : pulling value out of NSString

I have a bunch of NSStrings like 开发者_高级运维this....

{
     "score" = 15;
     "serial" = 8;
}

What is the best way to extract the values out of this string using "id" and "score"?

These are property lists in text format. See this answer for how to parse them. You'll get a NSDictionary from which you can pull the values as NSNumbers.