iOS4创建后台计时器

问题描述

我（基本上）需要在iOS 4上创建一个后台计时器，这将允许我在经过特定时间后执行一些代码。我已经读过你可以使用一些 [NSThread detachNewThreadSelector：
toTarget：
withObject：]; 来实现这个目的但是这在实践中如何运作？如何确保线程也保留在后台。本地通知将 NOT 为我工作，因为我需要执行代码，而不是通知用户。

I (Basically) need to create a background timer on iOS 4 that will allow me to execute some code when a specific amount of time has passed. I have read that you can accomplish this using some [NSThread detachNewThreadSelector: toTarget: withObject:]; but how does that work in practice? How can I ensure that the thread remains in the background also. Local notifications will NOT work for me, as I need to execute code, not notify the user.

帮助将不胜感激！

推荐答案

您可以使用这些调用在新线程中使用某个参数（withObject）执行对象（toTarget）的方法（选择器） （detachNewThred）。

You can use those call to execute a method (selector) of an object (toTarget) with some parameter (withObject) in a new thread (detachNewThred).

现在，如果你想执行延迟任务可能是最好的方法是 performSelector：withObject：afterDelay：以及如果你想在后台运行任务，请调用 detachNewThreadSelector：toTarget：withObject：

Now if you want to execute a delayed task may be the best approach is performSelector: withObject: afterDelay: and the if you want to run the task on background call the detachNewThreadSelector: toTarget: withObject:

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