有没有办法“找到神秘的保留” ...？ [英] Is there a way to "find mystery retains" ...?

问题描述

最近我正在修复某人的代码。有一个大班不会dealloc。您必须使用5或6个版本来获取它才能获得dealloc。

Recently I was repairing someone's code. There was a big class that would not dealloc. You'd have to hit it with 5 or 6 releases to get it to dealloc.

我仔细查看了大班并最终找到了需要的各种内容发布。

I carefully looked through the big class and eventually found the various things that needed to be released.

这让我想到：只需要一些非常简单的方法来找到对象的所有保留 ..我是对的吗？

This got me thinking: there just has to be some really easy way to "find" all the retains on an object .. am I right?

那么，是否有一种简单的方法可以找到对象的所有保留？是否有其他人都知道的XCode或Instruments中的按钮？

So, is there a simple way to "find all the retains" on an object? Is there a button in XCode or Instruments that everyone else knows about?

当你找不到这样的神秘保留时你会怎么做？

What do you do when you can't find a mystery retain like that?

所以在iOS世界中，如果有人知道显示所有保留来自此对象的位置按钮 - 谢谢！

So in the iOS universe, if anyone knows the "Show where all the retains came from on this object" button -- thanks!

PS请注意，没有泄漏，这个问题与泄漏完全无关。对象只是完全正确不会释放。

P.S. Note that there is no leak, and this question is totally unrelated to leaks. The object simply "perfectly correctly" wouldn't release.

稍后..

Fabio提供这个问题令人震惊的解决方案。九个字，这里是：

Fabio has provided an astounding solution to this problem. In nine words, here it is:

-(id)retain
    {
    NSLog(@"%@", [NSThread callStackSymbols]);
    return ([super retain]);
    }

这在许多情况下非常有用，并且会带来许多其他有用的东西。法比奥，你可能每年都为我节省了两个人一周的工作时间。谢谢！

That is amazingly useful in many situations and leads to many other useful things. You've probably saved me two man-weeks of work per annum forever, Fabio. Thanks!

顺便说一下，如果你刚刚掌握了这个并且在输出上挣扎，我看到通常会有很多以UINib instantiateWithOwner：为特色的块。看起来这些将首先出现，重要的块将会出现。

BTW if you're just getting to grips with this and struggling with the output, I saw that typically there will be many chunks featuring "UINib instantiateWithOwner:". It looks like those will come first, the significant chunks will follow.

推荐答案

只是猜测...但你可能会覆盖保留自定义类的方法调用super并抛出一个好的NSLog来打印调用堆栈。

Just guessing... but you may overwrite the retain method of the custom class calling super and throwing a nice NSLog to print the call stack.

-(id) retain {
NSLog(@"%@", [NSThread callStackSymbols]);
return ([super retain]);
}

另一个重要细节是[NSThread callStackSymbols]返回NSStrings的NSArray，它可以被过滤并用于其他目的。例如，在复杂和动态代码中，检查方法是否正确导致另一个方法触发。

Another important detail is that [NSThread callStackSymbols] returns a NSArray of NSStrings that can be filtered and used for other purposes. For example in complex and dynamic code, to check if a method properly causes another one to fire.

注意：
在ARC环境中，您需要先将 -fno-objc-arc 添加到编译器标志，以允许覆盖retain和call super。

NOTE: In an ARC environment you will need to first add the -fno-objc-arc to compiler flags to allow you to override retain and call super.

这篇关于有没有办法“找到神秘的保留” ...？的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！