Menu
I have 2 classes one includes methodA and the other include methodB. So in a new class I need to override the methods methodA and methodB. So how do I achieve multiple inheritance in objective C? I am little bit confused with the syntax.
906
In keeping with its clean and simple design, Objective C does not support multiple inheritance, though features have been developed to replace some of the functionality provided by multiple inheritance (see run-time section below). The root of the Objective C class hierarchy is the Object class.
Inheritance allows us to define a class in terms of another class which makes it easier to create and maintain an application. This also provides an opportunity to reuse the code functionality and fast implementation time.
Swift doesn't allow us to declare a class with multiple base classes or superclasses, so there is no support for multiple inheritance of classes. A subclass can inherit just from one class. However, a class can conform to one or more protocols.
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 Now you just need to invoke the method on the relevant ivar. It's more code, but there just isn't multiple inheritance as a language feature in objective-C.
62
If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
Donate Us With
