Question

我希望标题足够精确。我想知道如何将接口实现传递给objc语言的对象。

在java中它看起来像：

public interface MyInterface {
    void onData();
}

实施班级

public class ImplementMyInterface {

    // ...
    // other methods
    ///

    void registerInterface(){
         MyInterface myInterface = new MyInterface(){
             @Override
             public void onData(){
               // process data here within the class
             }
           }; 
     }
}

在objc？ id myinterface。

如何在课堂上实现它？是否只有让类继承接口的可能性？喜欢

interface MyInterface : NSObject

和实施类

MyImplementingClass : MyInterface

或者还有其他可能吗？提前谢谢

Answer 1

Objective-C has anonymous functions (blocks), but it doesn't have anonymous classes. So, the only way to implement a protocol (which is the objective-c term for an interface) is to make some class conform to that protocol (using your terminology, make that class "inherit" from that protocol) and add a protocol implementation inside that class' implementation.

Answer 2

我能够解决我的问题。我只能够在我的ImplementMyInterface.m文件中导入MyInterface头文件，而只能在ImplementMyInterface.h文件中导入。因此，我所能做的都是在ImplementMyInterface.m文件中。

// ImplementMyInterface.m
#import "MyInterface.h"

// inner class
@interface MyInternalInterface : NSObject<MyInterface>
@property (retain) ImplementMyInterface * implementation;
@end

// the actual class 
@implementation ImplementMyInterface
MyInternalInterface * _internalInterface;

+(instancetype) build {
  // construct myself
  ImplementMyInterface * implementatMyInterface = [[ImplementMyInterface alloc] init];

  // init inner class object
  _internalInterface = [[MyInternalInterface alloc] init];

  // register myself
  [_internalInterface setImplementation:implementatMyInterface];

  return implementatMyInterface;
}


- (NSString *) theActualData {
    return @"The actual data";
}







// end of implementation class
@end

// implementation of inner class
@implementation MyInternalInterface
@synthesize implementation;

- (NSString *) onData {
    if(implementation != nil)
        return [implementation theActualData];

    return @"";
}
// end of ImplementMyInterface.m

objective-c相当于java anonymouse接口实现

2 个答案: