任何人都可以在目标C中为正常类而不是类别或协议给出正向声明的示例？ [英] Can anyone give example of forward declaration in objective C for a normal class and not for category or protocol?

问题描述

任何人都可以在目标C中为正常类而不是类别或协议给出正向声明的示例？

Can anyone give example of forward declaration in objective C for a normal class and not for category or protocol?

推荐答案

/*
  using a forward declaration of NSDocument, there's no need
  for every source that encounters this header to include AppKit,
  allowing much faster compile times and reducing dependency
  changes for clients.

  of course, MONThang.m will need to include AppKit to use NSDocument
  - but the clients using MONThang do not need to import AppKit.
*/

@class NSDocument; // << the forward declaration

@interface MONThang : NSObject
{
    NSDocument * document;
}

@end

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