ios 自定义 dealloc 和 ARC (Objective-C)
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Custom dealloc and ARC (Objective-C)
提问by Niku
In my little iPad app I have a "switch language" function that uses an observer. Every view controller registers itself with my observer during its viewDidLoad:.
在我的小 iPad 应用程序中，我有一个使用观察者的“切换语言”功能。每个视图控制器在其viewDidLoad:.
- (void)viewDidLoad
{
[super viewDidLoad];
[observer registerObject:self];
}
When the user hits the "change language" button, the new language is stored in my model and the observer is notified and calls an updateUi:selector on its registered objects.
当用户点击“更改语言”按钮时，新语言会存储在我的模型中，观察者会收到通知并updateUi:在其注册的对象上调用选择器。
This works very well, except for when I have view controllers in a TabBarController. This is because when the tab bar loads, it fetches the tab icons from its child controllers without initializing the views, so viewDidLoad:isn't called, so those view controllers don't receive language change notifications. Because of this, I moved my registerObject:calls into the initmethod.
这非常有效，除非我在 TabBarController 中有视图控制器。这是因为当标签栏加载时，它从其子控制器获取标签图标而不初始化视图，因此viewDidLoad:不会被调用，因此这些视图控制器不会收到语言更改通知。因此，我将registerObject:调用移到了init方法中。
Back when I used viewDidLoad:to register with my observer, I used viewDidUnload:to unregister. Since I'm now registering in init, it makes a lot of sense to unregister in dealloc.
回到我过去viewDidLoad:向观察者注册时，我曾经viewDidUnload:取消注册。由于我现在正在注册init，因此取消注册很有意义dealloc。
But here is my problem. When I write:
但这是我的问题。当我写：
- (void) dealloc
{
[observer unregisterObject:self];
[super dealloc];
}
I get this error:
我收到此错误：
ARC forbids explicit message send of 'dealloc'
ARC 禁止“dealloc”的显式消息发送
Since I need to call [super dealloc]to ensure superclasses clean up properly, but ARC forbids that, I'm now stuck. Is there another way to get informed when my object is dying?
由于我需要调用[super dealloc]以确保超类正确清理，但 ARC 禁止这样做，我现在被卡住了。当我的对象即将死亡时，还有其他方法可以得到通知吗？
回答by justin
When using ARC, you simply do not call [super dealloc]explicitly - the compiler handles it for you (as described in the Clang LLVM ARC document, chapter 7.1.2):
使用 ARC 时，您只需不[super dealloc]显式调用- 编译器会为您处理它（如Clang LLVM ARC 文档第 7.1.2 章所述）：
- (void) dealloc
{
[observer unregisterObject:self];
// [super dealloc]; //(provided by the compiler)
}
