我应该何时释放 [[UIApplication sharedApplication] delegate] 对象?

问题描述

我在我的应用程序中多次使用以下代码(尤其是用于管理 NavigationController):

I'm using the following code many times in my app (especially to manage a NavigationController):

MyAppDelegate *appDelegate = [[UIApplication sharedApplication] delegate]; 

我应该什么时候发布它?

When should I release it ?

感谢您的帮助，

斯蒂芬

推荐答案

不要.从不释放您的应用程序委托 - 它由操作系统自动管理.

Don't. Never release your application delegate - it is managed automatically by the OS.

如果您查看应用程序的 main.m 文件，您会看到一些代码初始化了代表您的应用程序的 UIApplication 实例 - 它负责管理应用程序委托的生命周期，而不是你的责任.

If you look in your app's main.m file, you'll see some code that initializes an instance of UIApplication that represents your app - it is its responsibility to manage the application delegate's lifecycle, not your responsibility.

EDIT 正如@Goz 指出的那样，如果您在某个时候 retain 它，则应该 release 它.然而，由于应用程序对象(以及因此，它的委托)保证在应用程序的生命周期内保持在范围内(除非你去搞砸它)，最好简单地 不对委托进行任何内存管理，因为这样可以避免意外过度释放或其他相关问题的可能性.

EDIT as @Goz points out, you should release it if at some point you retain it. However, since the application object (and therefore, by extension its delegate) is guaranteed to remain in scope for the life of the app (unless you go messing with it), it's far better to simply not do any memory management on the delegate, as this avoids the possibility of accidental over-release or other related issues.

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