Cocoa：将json字符串反序列化为自定义对象（不是NSDictionary，NSArray）

In java-land, there are a handful of useful libraries which will convert json strings to objects of matching type. The json libraries I've seen for cocoa simply create nested NSDictionaries and NSArrays. Is there a tool out there which will go the extra step of reconstituting whatever object type I want? In java-land, there are a handful of useful lib