send -release或-drain到Autorelease Pool有什么区别？ [英] What's the difference between sending -release or -drain to an Autorelease Pool?

问题描述

在许多书籍和许多网站上，我看到了-drain。那么，对于一个声音酷的Autorelease池。但它除了发布之外做什么？我会猜测-drain只是使池释放它的所有对象，而不释放池本身。注意，对oxigen的回答说，-drain不释放NSAutoreleasePool是不正确的注释。

解决方案。 NSAutoreleasePool 的文档清楚地说明-drain是NSAutoreleasePool对象使用-release的替代品，唯一的区别在于，它提供了一个提示，用于指示NSAutoreleasePool对象是否已经被释放（这样就破坏了NSAutoreleasePool）。

<垃圾收集系统。

In many Books and on many Sites I see -drain. Well, for an Autorelease Pool that sounds cool. But does it do anything other than an release? I would guess -drain just makes the Pool to -release all it's objects, without releasing the Pool itself. Just a guess.

解决方案

Note that the comments on oxigen's answer saying that -drain does not release the NSAutoreleasePool are not correct. The documentation for NSAutoreleasePool clearly says that -drain releases (and thus destroys) the NSAutoreleasePool.

-drain is a replacement for using -release for NSAutoreleasePool objects, the only difference being that provides a hint to the garbage collection system.

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