什么是最好的方式使用Obj-C 2.0属性与可变对象，如NSMutableArray？ [英] What's the best way to use Obj-C 2.0 Properties with mutable objects, such as NSMutableArray?

问题描述

我有一个Obj-C 2.0类，它有一个NSMutableArray属性。如果我使用下面的代码，那么合成的setter将给我一个不可变的副本，而不是一个可变的副本：

I have an Obj-C 2.0 class that has an NSMutableArray property. If I use the following code, then the synthesised setter will give me an immutable copy, not a mutable one:

@property (readwrite, copy) NSMutableArray *myArray;

有没有理由苹果没有实现以下语法？

Is there any reason that Apple didn't implement the following syntax?

@property (readwrite, mutablecopy) NSMutableArray *myArray;

由于我们没有 mutablecopy 什么是最好的办法来处理这个（貌似常见的）情况？

Since we don't have mutablecopy, what's the best way to handle this (seemingly common) situation? Should I just write my own setter that does a -mutableCopy?

推荐答案

如前所述，正确的方式

As said before, the right way to do it is not to make the mutable array a property. There's a great explanation of what you should implement to be KVC compliant here.

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