什么是ObjectiveC的retainCount？ [英] What is retainCount in Objective-C?

问题描述

我有一个 UITableView 作为我的第一个屏幕与 UINavigation 控制器。

I have a UITableView as my first screen with a UINavigation controller.

在我的第一个屏幕我 NSLog（@主屏幕保留计数=％d，[self retainCount]）;

这是否正确？

推荐答案

retainCount是对象上所有权声明的数量。

The retainCount is the number of ownership claims there are outstanding on the object.

使用名称以alloc或new开头或包含copy（例如alloc，newObject或mutableCopy）的方法或者如果向其发送保留消息来创建它。所有这些都增加了retainCount。

You take ownership of an object if you create it using a method whose name begins with "alloc" or "new" or contains "copy" (for example, alloc, newObject, or mutableCopy), or if you send it a retain message. All of these increment the retainCount.

使用release或autorelease放弃所有权。这些减少了retainCount。

You relinquish ownership with using "release" or "autorelease". These decrement the retainCount.

但是你不应该注意retainCount的值，这是最令人困惑的，在最坏的误导。只需按照内存管理规则操作，即可获取所有权你需要保存一个对象的引用，并在完成后放弃所有权，并且你不会有问题。

However you should never pay any attention to the value of retainCount, it is at best confusing, at worst misleading. Simply follow the memory management rules - take ownership when you need to keep a reference to an object and relinquish ownership when you are finished, and you wont have a problem.

如果你正在查看retainCount，事情的方式错误，你只会进一步混淆自己。

If you are looking at retainCount, you are going about things the wrong way, and you will simply confuse yourself further.

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