可以将其他项目添加到现有枚举类型？ [英] Possible to add another item to an existing enum type?

问题描述

不知是否有可能增加/另一个项目追加到现有枚举类型（框架的一部分）？

I wonder whether it is possible to add/append another item to an existing enum type (part of a framework)?

事情是这样的：我们有枚举键入

Something like this: We have the enum type

  typedef enum {  
    UIModalTransitionStyleCoverVertical = 0,  
    UIModalTransitionStyleFlipHorizontal,
    UIModalTransitionStyleCrossDissolve,
    UIModalTransitionStylePartialCurl,
 } UIModalTransitionStyle;  

现在我想追加或添加到这个设置像 UIModalTransitionStyleCoverVerticalFlipped 的项目。
可这样的事情来实现？

Now I want to append or add to this set an item like UIModalTransitionStyleCoverVerticalFlipped. Can something like this be accomplished?

推荐答案

您可以强制新元素具有相同类型的枚举，但可以将其在子类中不能延长。
头文件：

You can force new element to have the same type as the enum, but you can't extend it in a subclass. header file:

extern const UIModalTransitionStyle UIModalTransitionStyleCoverVerticalFlipped;

实现文件：

const UIModalTransitionStyle UIModalTransitionStyleCoverVerticalFlipped = 10;

确认给予一定空间的情况下，该框架被扩展，使您不必冲突。这是一个黑客位，但它会摆脱编译器错误和警告。

Make sure to give some space in case the framework is extended, so that you don't have conflicts. This is a bit of a hack, but it will get rid of compiler errors and warnings.

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