NSNotificationCenter 与委派(使用协议)?

NSNotificationCenter vs delegation( using protocols )?(NSNotificationCenter 与委派(使用协议)?)

问题描述

它们各自的优缺点是什么?
我应该具体在哪里使用它们?

What are the pros and cons of each of them?
Where should I use them specifically?

推荐答案

这里的经验法则是有多少客户希望收到事件通知.如果它主要是一个对象(例如，关闭视图或对单击的按钮进行操作，或对下载失败做出反应)，那么您应该使用委托模型.

The rule of thumb here is how many clients would like to be notified of an event. If it's mainly one object (e.g. to dismiss a view or to act upon a button clicked, or to react to a failed download) then you should use the delegate model.

如果您发出的事件可能同时对许多对象感兴趣(例如屏幕旋转、内存使用、用户登录/注销)，那么您应该使用 NSNotificationCenter.

If the event you emit may be of an interest to many objects at once (e.g. screen rotated, memory usage, user login/logout), then you should use the NSNotificationCenter.

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