如何正确释放对象？
我知道在 iOS 5 中有自动引用计数，它消除了所有这些的需要，但无论如何它非常简单。
在释放对象之前将其设置为 nil 是一个好的做法，还是反之亦然，先释放它然后将其设置为 nil？
不管怎样，我只是想摆脱我的应用程序中任何崩溃的可能性，我只是想用这种方式来防止它。
谢谢！
I know that in iOS 5 there is automatic reference counting which takes away the need for all of this but it is very simple anyway.
Is it good practice to set an object to nil before you release it or is it vice versa where you release it then set it to nil?
Anyway, I just want to get rid of any possibilities of crashes in my app and I just want this way to prevent it.
Thanks!
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对 nil 调用
release不会产生任何效果。Calling
releaseon nil accomplishes nothing.当您使用自动引用计数时，您无法调用
release。这样做是一个编译器错误。在手动引用计数中，您应该
release，然后设置为nil。将变量设置为nil，然后调用release会泄漏对象（不会释放它）。它不会崩溃，但会消耗内存（最终可能会占用太多内存，导致操作系统将您关闭）。ARC 绝对是帮助您减少崩溃的最佳工具。没有任何机制可以消除所有崩溃的可能性。但两个非常简单的规则会有所帮助：
还有许多其他较小的规则，但这是每个 iOS 开发人员都应该开始的两条规则。
When you use automatic reference counting, you cannot call
release. It is a compiler error to do so.In manual reference counting, you should
releaseand then set tonil. Setting a variable toniland then callingreleaseleaks the object (it does not release it). It won't crash, but it will eat memory (eventually possibly so much memory that the OS will shut you down).ARC is your absolute best tool for helping reduce crashes. There is no mechanism that can remove all possibilities of crashes. But two very simple rules will help:
There are many other smaller rules, but those are the two that every iOS developer should start with.
不，在释放对象之前，不要将其设置为 nil，如果将其设置为 nil，基本上你会丢失指向对象的指针，现在你的变量指向 nil。将 release 发送到 nil 不会执行任何操作。如果你想保护自己免受垃圾值/指针的影响，可以在释放对象后将其设置为 nil。但是，我不明白为什么你需要将它设置为 nil，除非它是一个实例变量。
No, you don't set it to nil before you release the object, if you set it to nil, basically you lose pointer to your object, and now your variable is pointing to nil. Sending release to nil does nothing. If you want to protect yourself from garbage value / pointer, you can set it to nil, after you release the object. But, I don't see why you need to set it to nil other than if it's an instance variable.