如何在NSMutableArray中存储枚举值 [英] How to store enum values in a NSMutableArray

问题描述

我的问题是因为objective-c中的枚举本质上是一个int值，我不能将它存储在 NSMutableArray 。显然 NSMutableArray 不会像任何c类型的数据类型。

My problem is since an enum in objective-c essentially is an int value, I am not able to store it in a NSMutableArray. Apparently NSMutableArray won't take any c-data types like an int.

有没有什么常见的方法来实现这一点？

Is there any common way to achieve this ?

typedef enum 
{
    green,
    blue,
    red

} MyColors;


NSMutableArray *list = [[NSMutableArray alloc] initWithObjects:
                             green,
                             blue,
                             red,
                             nil];

//Get enum value back out
MyColors greenColor = [list objectAtIndex:0];

推荐答案

将枚举值放入NSNumber之前数组：

Wrap the enum value in an NSNumber before putting it in the array:

NSNumber *greenColor = [NSNumber numberWithInt:green];
NSNumber *redColor = [NSNumber numberWithInt:red];
NSNumber *blueColor = [NSNumber numberWithInt:blue];
NSMutableArray *list = [[NSMutableArray alloc] initWithObjects:
                             greenColor,
                             blueColor,
                             redColor,
                             nil];

并检索如下：

MyColors theGreenColor = [[list objectAtIndex：0] intValue];

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