objective-c list type in a class how to define

For example in c #,, class a can define a list alist = new list ;
objective-c of how representation

Reply:
Use NSArray. But NSArray can not affirm what the inside is filled with the type of data.
Reply:
NSArray is fixed array, there is another variable, NSMutableArray
Reply:
NS (Mutable) Array + NS (Mutable) Dictionary combined on ok.
Reply:
C # in the list of list == OC in NSArray