代表的非保留数组 [英] Non-retaining array for delegates

问题描述

在Cocoa Touch项目中，我需要一个特定的类，不仅有一个委托对象，而且还有很多。

In a Cocoa Touch project, I need a specific class to have not only a single delegate object, but many of them.

看起来我应该创建一个NSArray为这些代表;
问题是NSArray将保留所有这些委托，它不应该（通过约定对象不应该保留他们的委托）。

It looks like I should create an NSArray for these delegates; the problem is that NSArray would have all these delegates retained, which it shouldn't (by convention objects should not retain their delegates).

我自己的数组类防止保留或有更简单的方法？
谢谢！

Should I write my own array class to prevent retaining or are there simpler methods? Thank you!

推荐答案

我之前发现这段代码）。

I found this bit of code awhile ago (can't remember who to attribute it to).

这是相当ingenius，使用类别允许创建一个可变的数组，没有保留/释放，支持 CFArray

It's quite ingenius, using a Category to allow the creation of a mutable array that does no retain/release by backing it with a CFArray with proper callbacks.

@implementation NSMutableArray (WeakReferences)
    + (id)mutableArrayUsingWeakReferences {
    return [self mutableArrayUsingWeakReferencesWithCapacity:0];
    }

    + (id)mutableArrayUsingWeakReferencesWithCapacity:(NSUInteger)capacity {
    CFArrayCallBacks callbacks = {0, NULL, NULL, CFCopyDescription, CFEqual};
    // We create a weak reference array
    return (id)(CFArrayCreateMutable(0, capacity, &callbacks));
    }
@end

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