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"?

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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.