小编Hwe*_*Yar的帖子

我有一个协议。

MyProtocol.h：

@protocol MyProtocol
  @property(nonatomic, retain) NSString* someString;
  - (void)doesSomethingWithSomeString;
@end

和2个实现相同协议的类。由于某些原因，这两个类不能从相同的基类继承。例如，其中之一可能需要继承自NSManagedObject（Apple Cocoa框架中的Core Data类），而另一个则不需要。

Class1.h：

@interface Class1: NSObject<MyProtocol> {
  NSString* someString;
}

//Some method declarations

@end

Class1.m

@implementation Class1
  @synthesize someString;

  - (void)doesSomethingWithSomeString {
    //don't use property here to focus on topic
    return [[self someString] capitalizedString];
  }

  //Method definitions for methods declared in Class1
@end

Class2.h：

@interface Class2: SomeOtherClass<MyProtocol> {
  NSString* someString;
}

//Some method declarations

@end

Class2.m

@implementation Class2
  @synthesize someString;

  // This is exactly the same as -doesSomethingWithSomeString …