Unexpected ‘@’ in program. 直接在协议文件h.里面实现 报警告 求解答

@protocol Forkable

@optional

• (void)fork;

@required

• (NSString *)github;

• (void)jzj;
  @EnD
  // Protocol Extension
  @defs(Forkable)

• (void)fork {
  NSLog(@"Forkable protocol extension: I'm forking (%@).", self.github);
  }

• (void)jzj {

  NSLog(@"jzj");
  }

• (NSString *)github {
  return @"This is a required method, concrete class must override me.";
  }
  @EnD

[beforeold]

Obviously, it is FORBIDDEN to implement any method in a .h file.