ARC下的id数组成员实例 [英] id array member instance under ARC

问题描述

我想写这样的东西:

@interface Foo{

    __strong id idArray[]; 

}
@end

但是编译器对此抱怨:

Field has incomplete type '__strong id []'.

如何在ARC下创建id数组成员实例?以及如何初始化该数组? 使用malloc?新的[]?

How can I create an id array member instance under ARC? And how do I init that array? Using malloc? new[]?

我不想使用NSArray，因为我正在将大型库转换为ARC，这会导致很多工作.

I don't want to use NSArray because I'm converting a large library to ARC and that will cause a lot of work.

推荐答案

如果要动态分配数组，请使用ID为__strong的指针类型.

If you want to allocate dynamically the array, use pointer type of id __strong.

@interface Foo
{
    id __strong *idArray;
}
@end

使用calloc分配数组. __strong的ID必须以零开头.

Allocate the array using calloc. id __strong must be intialized with zero.

idArray = (id __strong *)calloc(sizeof(id), entries);

完成后，必须将nil设置为数组的项，然后释放.

When you are done, you must set nil to the entries of the array, and free.

for (int i = 0; i < entries; ++i)
    idArray[i] = nil;
free(idArray);

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