获取枚举项的总数 [英] Getting total number of enum items

问题描述

是否可以在运行时获取由枚举定义的项目总数？

Is it possible to get the total number of items defined by an enum at runtime?

尽管与这一个，这个问题与C＃有关，据我所知，该方法只要在Objective-C中不起作用。

While it's pretty much the same question as this one, that question relates to C#, and as far as I can tell, the method provided there won't work in Objective-C.

推荐答案

一个枚举是一个普通的C类型，因此它不提供动态的运行时信息。

An enum is a plain-old-C type, therefore it provides no dynamic runtime information.

另一种方法是使用枚举的最后一个元素来表示计数： / p>

One alternative is to use the last element of an enum to indicate the count:

typedef enum {
    Red,
    Green,
    Blue,
    numColors
} Color;

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