如何在类实现中区分两个协议的相同方法名称？

问题描述

我有两个协议

@protocol P1

-(void) printP1;

-(void) printCommon;

@end


@protocol P2

-(void) printP2;

-(void) printCommon;
@end

现在，我在一个类中实现这两个协议

Now, I am implementing these two protocols in one class

@interface TestProtocolImplementation : NSObject <P1,P2>
{

}

@end

我如何为printCommon编写方法实现。当我尝试执行时，我有编译时错误。

How can i write method implementation for "printCommon". When i try to do implementation i have compile time error.

是否有可能为printCommon编写方法实现。

Is there any possibility to write method implementation for "printCommon".

推荐答案

常见的解决方案是分离公共协议并使派生协议实现通用协议，如下所示：

The common solution is to separate the common protocol and make the derived protocols implement the common protocol, like so:

@protocol PrintCommon

-(void) printCommon;

@end

@protocol P1 < PrintCommon > // << a protocol which declares adoption to a protocol

-(void) printP1;

// -(void) printCommon; << available via PrintCommon

@end


@protocol P2 < PrintCommon >

-(void) printP2;

@end

现在采用 P1的类型和 P2 还必须采用 PrintCommon 的方法才能完成采用，而你可以通过 NSObject< PrintCommon> * 参数安全地传递 NSObject< P1> * 。

Now types which adopt P1 and P2 must also adopt PrintCommon's methods in order to fulfill adoption, and you may safely pass an NSObject<P1>* through NSObject<PrintCommon>* parameters.

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