iphone - is there a way to define a variable thats accessible to some classes and not others? -

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in objective-c, access variables limited 3 types @public , @private , @protected (default) , @package .. these access modifiers allow access variable through 4 situations in order :

1- access variable anywhere.

2- access variable inside class.

3- access variable anywhere in class , subclasses.

4- access variable anywhere in framework.

my question is: there way define variable accessible classes , not others ? (i.e. customised scope variables)

what you're asking c++'s friend keyword. friend classes in objective-c discusses topic.


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