Can protocols in protocols be considered as being included in the protocol that they accept?

Question

I assign protocols in pairs of classes that follow the inheritance tree. For example:

first grade

@protocol LevelOne
- (void) functionA
@end

@interface BaseClass : NSObject <LevelOne> {
}

second class

@protocol LevelTwo <LevelOne>
- (void) functionB
@end

@interface SubClass : BaseClass <LevelTwo> {
}

Later I assign the class as delegation properties of other classes

base class

@interface AppClass : NSObject {
    @protected
    id<LevelOne> levelOneDelegate;
}

@property (assign) id<LevelOne> levelOneDelegate;

subclass

@interface AppClassesFriend : AppClass {
    @protected
    id<LevelTwo> levelTwoDelegate;
}

@property (assign) id<LevelTwo> levelTwoDelegate;

At the end of this journey, AppClassesFriend has 2 properties.

"levelOneDelegate" has access to the function "functionA" when a BaseClass object is assigned to it.

However, I find that "levelTwoDelegate" only has access to "function B" (it is assigned a SubClass object).

So that the AppClassesFriend application can use both functions, it seems I need to assign BOTH levelOneDelegate AND levelTwoDelegate.

"levelTwoDelegate" ? "SubClass".

, :

SubClass *s = [SubClass alloc];
AppClassesFriend *a = [AppClassesFriend alloc];
a.levelTwoDelegate = s;

AppClassesFriend (a) :

 [self.levelTwoDelegate functionA];   <---- this is never found
 [self.levelTwoDelegate functionB];

, ,

a.levelOneDelegate = s;

, - , . , , , "levelTwoDelegate" , , B?

Answer 1

, 1, 2 (.. functionA functionB):

@interface AppClassesFriend : AppClass {
    @protected
    id<LevelOne,LevelTwo> levelOneAndTwoDelegate;
}

@property (assign) id<LevelOne,LevelTwo> levelOneAndTwoDelegate;