在Objective-C使用枚举？ [英] Using enum in Objective-C?

问题描述

这是正确的（甚至是一个有效的方式）在Objective-C使用emums？即不使用菜单项，但只是定义了一个列表中添加= 1，负载= 2，表= 3等。

Is this the correct (or even a valid way) to use emums in Objective-C? i.e. The menuItem is not used but just defines a list add=1, load=2, list=3 etc.

enum menuItems {
    add = 1    ,
    save       ,
    load       ,
    list       ,
    removeAll  ,
    remove     ,
    quit       
};

int optionSelect;

scanf("%d", &optionSelect);

switch (optionSelect) {
    case add: 
        //...
        break;
}

欢呼加里

推荐答案

如果你想给一个语义的枚举，你可以考虑定义一个定制的类型和声明变量optionSelect作为该类型的变量！
在code ...

If you want to give a semantic meaning to the enumeration, you can consider to define a customized type and declare the variable "optionSelect" as variable of that type! In code...

typedef enum menuItems {
       add = 1,
       save,
       load,
       list,
       removeAll,
       remove,
       quit} MenuItem;


MenuItem optionSelect;

scanf("%d", &optionSelect);

switch (optionSelect) {
    case add: 
    ...
    break;
    .
    .
    .
}

这是差不多，你已经写了，但是从开发商的侧面你给一个特定意义的变量optionSelect同样的事情，而不仅仅是一个简单的INT！

That is, almost, the same thing you have written, but from the side of the developer you give a particular meaning to the variable "optionSelect", not just a simple int!

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