iOS4 创建后台定时器

问题描述

我(基本上)需要在 iOS 4 上创建一个后台计时器，它允许我在经过特定时间后执行一些代码.我读过你可以使用一些 [NSThread detachNewThreadSelector:达到目标:withObject:]; 但在实践中它是如何工作的呢?如何确保线程也保留在后台.本地通知不对我有用，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.

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推荐答案

您可以使用这些调用在新线程 (detachNewThred) 中执行带有某些参数 (withObject) 的对象 (toTarget) 的方法 (选择器).

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，如果您想执行延迟任务，最好的方法可能是 performSelector: withObject: afterDelay:，如果您想在后台运行任务，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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