我该什么时候打电话给超级 [英] When should I call super?

问题描述

[super ...任何方法名称] 的最佳使用方法是什么？最近我发现在dealloc中， [super dealloc] 必须站在同一个目的。因为如果我们在 [super dealloc] 之后设置它，任何以前没有使用的变量都可以被垃圾填充。这是一件罕见的事情，但它是可能的。在此之后，我们的应用程序将崩溃。

What is the best using of [super ... any method name]. Recently I have found out that In dealloc the [super dealloc] must stand in the same end. Because any variable what didn't use before can be filled by garbage if we set it after [super dealloc] It's a rare thing, but it's possible. After this we will have crash in our app.

那么使用super方法的最佳方法是什么，例如最好用于 - （void）viewWillAppear：（BOOL）动画。 [super viewWillAppear：（BOOL）动画] 在正文开头或最后的最佳位置在哪里？

So what is the best using of super method, for example what is best using for -(void)viewWillAppear:(BOOL)animated. Where is the best place for [super viewWillAppear:(BOOL)animated] in the begin of body or in the end?

推荐答案

通常的经验法则是当你重写一个进行某种初始化的方法时，你先调用super，然后做你的东西。当你覆盖某种拆解方法时，你会打电话给最后一个：

The usual rule of thumb is that when you are overriding a method that does some kind of initialization, you call super first and then do your stuff. And when you override some kind of teardown method, you call super last:

- (void) setupSomething {
    [super setupSomething];
    …
}

- (void) tearDownSomething {
    …
    [super tearDownSomething];
}

第一种方法是 init ... ， viewWillAppear ， viewDidLoad 或 setUp 。第二个是像 dealloc ， viewDidUnload ， viewWillDisappear 或 TEARDOWN 。这不是一个硬性规则，它只是从方法所做的事情开始。

The first kind are methods like init…, viewWillAppear, viewDidLoad or setUp. The second are things like dealloc, viewDidUnload, viewWillDisappear or tearDown. This is no hard rule, it just follows from the things the methods do.

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