Multiple inheritance in Objective-c

Objective-C doesn't support multiple inheritance, and you don't need it. Use composition:

@interface ClassA : NSObject {

  ...

}

-(void)methodA;

@end

@interface ClassB : NSObject {

  ...

}

-(void)methodB;

@end

@interface MyClass : NSObject {

    ClassA *a;

    ClassB *b;

}

-(id)initWithA:(ClassA *)anA b:(ClassB *)aB;

-(void)methodA;

-(void)methodB;

@end