Objective-C 多重继承 [英] Objective-C multiple inheritance

问题描述

我有两个类，一个包括methodA，另一个包括methodB.所以在一个新类中，我需要覆盖方法 methodA 和 methodB.那么如何在目标 C 中实现多重继承呢?我对语法有点困惑.

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.

推荐答案

Objective-C 不支持多重继承，你不需要它.使用组合:

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

现在您只需要调用相关 ivar 上的方法.这是更多的代码，但在 Objective-C 中没有多重继承作为语言特性.

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.

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