我需要释放局部变量吗？

发布于 2024-12-09 02:17:28 字数 121 浏览 0 评论 0原文

在我的应用程序中，我有一个在本地声明的 NSError：

NSError *error;

我是在 dealloc 方法中释放它还是需要在我声明它的方法中释放它？

原文

In my app I have a NSError that I declare locally:

NSError *error;

Do I release it in dealloc method or do I need to release it in the method I declare it?

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强者自强 2024-12-16 02:17:28

请阅读Cocoa内存管理指南，内存管理是个东西你应该完全理解。（而且这并不难。）如果您在方法中声明一个变量，则在dealloc中没有指向它的指针，因此您无法在那里释放它——您只能在之前释放它它超出了范围。另一个问题是你是否应该释放它。这取决于它是基于堆栈的、自动释放的还是保留的变量：

float foo[] = {1, 2, 3}; // stack-based, no releasing necessary
NSString *foo = [NSString stringWithFormat:…]; // autoreleased, you must not release it
NSString *foo = [[NSString alloc] initWith…]; // retained, you must release it

Please read the Cocoa Memory Management Guide, memory management is something you should understand perfectly. (And it’s not hard.) If you declare a variable in a method, you don’t have a pointer to it in dealloc, therefore you can’t release it there – you can only release it before it goes out of scope. Another question is if you should release it at all. That depends on whether it is a stack-based, autoreleased or retained variable:

float foo[] = {1, 2, 3}; // stack-based, no releasing necessary
NSString *foo = [NSString stringWithFormat:…]; // autoreleased, you must not release it
NSString *foo = [[NSString alloc] initWith…]; // retained, you must release it

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