在哪里和如何注册接收通知的对象？ [英] Where and how do I register an object for receiving a Notification?

问题描述

例如，当内存变低时，系统会发送 UIApplicationDidReceiveMemoryWarningNotification 通知。这就是苹果在这一点上的文章。但这个通知来自哪里，以及发送到哪个方法？

For example, when memory gets low, the System sends a UIApplicationDidReceiveMemoryWarningNotification notification. That's all Apple says in its docs at that point. But where does this notification come from, and to which method is it sent? Or where and how do I register what that I get notified?

推荐答案

它会发送到通知中心，其中所有通知集中。要通知此通知的对象通知哪个通知要通知哪个通知，以及在通知发出时应该调用哪个方法。

It is sent to the notification center, where all notifications are centralized. An object that wants to get informed about this notification registers itself to the notification center by telling which notification it wants to get informed and which method should be invoqued when the notification is raised.

有关详情，请参阅通知编程主题for Cocoa 和 NSNotification类参考。

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