从应用程序的线程中触发多个视图控件的事件

问题描述

我有一个NSAutoreleasePool线程，旨在从Web服务中提取信息，我的Web服务代码工作得很好，我可以触发线程启动在视图控制器没有任何麻烦，实际上它的工作相当不错

我想：

• 将线程实例化移动到appDelegate - 容易！


• 让它定期运行，并以某种方式告诉它下面的viewcontrollers（5 - 10）如果下载了新的信息


• 有手动的能力执行调度程序之外的线程

我可以使用performSelectorOnMainThread启动appdelegate上的方法，但是如何可以让我的子视图控制器要订阅一个方法的appdelegate？

解决方案

使用NSNotificationCenter你可以发布，通知：D
这样没有appDelegate现在其他类可以订阅到其他类他的通知他们需要。

另外，我会保持线程活着，每次产生一个新的线程是昂贵的，只有经常生成它。我建议使用GCD（iOS 4+）

I have an NSAutoreleasePool thread that is designed to pull information down from a web service, i have the web service code working nicely and i can trigger the thread to start in a view controller without any trouble, in fact its working quite nicely.

I want to:

• move the thread instantiation to the appDelegate - easy!
• have it run periodically and somehow tell the viewcontrollers under it (5 - 10) if new information is downloaded
• have the capacity to manually execute the thread outside of the scheduler

I can fire up a method on the appdelegate using performSelectorOnMainThread but how i can get my child view controllers to "subscribe" to a method on the appdelegate?

解决方案

Using NSNotificationCenter you can post well, notifications :DThat way without the appDelegate nowing the other classes the other classes can "subscribe" to the notifications they need.

Also, i would keep the thread alive, spawning a new thread everytime is costly, ofc only if it is spawned often. I would recommend using GCD ( iOS 4+ )

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