class or structure?

Question

Objective-C

Help with advice to a beginner: what type of object is best to use to organize an NSMutableDictionary?
As I understand it, they usually use objects of some class, or you can wrap the structure in NSValue (withObjCType).
What is the difference?

Answer 1

If you have reference fields in the structure - like const char * - then withObjCType will not save you.
Use classes (NSObject descendants) wherever you don't have performance issues.

Answer 2

withObjCType will not wrap the structure. Yes, and it makes sense to wrap it in NSValue, make a class right away.

Answer 3

the structure is simple - a few floats. but the array is big enough and it's all for ios. In such a case would using a class be potentially slower than a struct?