是否可以知道 iPhone 何时进入睡眠状态？
是否有任何通知可以提醒我手机将进入睡眠状态？我已经实现了以下内容：
[[NSNotificationCenter defaultCenter]
addObserver:self
selector:@selector(resignActive:)
name:UIApplicationDidEnterBackgroundNotification
object:nil];
但当手机在一段时间不活动后（在我的设置中为 1 分钟）进入睡眠状态时，它似乎不会被触发。我认为它不起作用的原因是我有一个计时器，每秒执行一个操作，如果经过了一定时间（大于一分钟），它会发出音频警报。在我的 resignActive 中，我使计时器无效，当我按下主页按钮时，计时器工作正常，但当手机进入睡眠状态时，计时器就不起作用。它似乎仍在后台运行，但“速度较低”，因为时间比正常情况长得多（大约 10 分钟而不是 2 分钟）。
你知道手机进入睡眠状态时会发生什么吗？我读过这两篇文章，但它并没有真正回答我的问题。
Is there any notification I can listen to that will alert me that the phone will go to sleep? I have implemented the following:
[[NSNotificationCenter defaultCenter]
addObserver:self
selector:@selector(resignActive:)
name:UIApplicationDidEnterBackgroundNotification
object:nil];
but it seems that it's not getting triggered when the phone goes to sleep after some time of inactivity (1 min in my settings). The reason I think it's not working is that I have a timer that perform an action every second and if a certain time has passed (bigger than one minute) it issues an audio alarm. In my resignActive I invalidate my timer and that works fine when I press the home button, but not when the phone goes to sleep. It still seems to be running in the background but "at a lower speed" as the times are much longer than normal (around 10 min instead of 2 min).
Any ideas what's happening when the phone goes to sleep? I have read these two posts but it doesn't really answer my question.
What happens to an iPhone app when iPhone goes into stand-by mode?
Iphone app is delayed for 10 -15 minutes when iphone is in sleep mode
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在 UIApplicationDelegate 上实现这 2 个方法：
当显示来自另一个应用程序（或 SMS）的推送通知时也会调用它......
Implements those 2 methods on the UIApplicationDelegate :
It will be called also when a push notification from another app (or a SMS) is shown...