Question

我想知道iOS是否向应用发送通知，表明系统会将设备置于“睡眠”状态。因为我希望我的应用程序在设备进入＆＃34; sleep＆＃34;州。

Answer 1

答案是＆＃34;否＆＃34;。您只能跟踪应用程序状态而不是设备状态。

Answer 2

好答案：

我设法收到＆＃34; com.apple.springboard.lockcomplete＆＃34;通知使用CFNotificationCenterAddObserer。但是，如果我的应用程序正在运行后台，它无法接收通知。为了解决这个问题，我添加了UIBackgroundModes（= audio）以播放静音音频。在最后，该应用程序运行良好。

索菲亚

通知：

   - (void)applicationDidEnterBackground:(UIApplication *)application {
        UIApplicationState state = [[UIApplication sharedApplication] applicationState];
        NSLog(@"Device state: %@", state);
        switch (state) {
            case UIApplicationStateActive:
                /* ... */
                break;

        case UIApplicationStateInactive:
            /* Device was/is locked  */
            break;
        case UIApplicationStateBackground:
            /* User pressed home button or opened another App (from an alert/email/etc) */
            break;
    }
}

Enum：

UIApplicationState - The running states of an application

typedef enum {
    UIApplicationStateActive,   
    UIApplicationStateInactive,
    UIApplicationStateBackground
}
UIApplicationState

Constants

UIApplicationStateActive - The application is running in the foreground and currently receiving events. Available in iOS 4.0 and later.

UIApplicationStateInactive - The application is running in the foreground but is not receiving events. This might happen as a result of an interruption or because the application is transitioning to or from the background.

UIApplicationStateBackground - The application is running in the background.

资料来源：Is it possible to distinguish between locking the device and sending an app to background?

Answer 3

当设备进入非活动状态时，它会发送通知

- (void)applicationWillResignActive:(UIApplication *)application

此方法应在应用程序委托中实现。当进入非活动状态时，它将自动调用。它也会在您接到电话时调用

Answer 4

不，唯一的通知可以满足您的需求UIApplicationWillResignActiveNotification，但也会在

时发布

用户下拉通知中心

闹钟响起来了

在警报视图中显示推送通知。

Answer 5

＆＃34; com.apple.springboard.lockcomplete＆＃34;是我用来解决问题的通知。

接收＆＃34; com.apple.springboard.lockcomplete＆＃34;通知，我在applicationDidFinishLaunching中使用了CFNotificationCenterAddObserer。（据说私有api~）

但是，如果我的应用程序在后台运行，则无法接收通知。为了解决这个问题，我添加了UIBackgroundModes（= audio）来播放静音。最后，该应用程序运行良好。

感谢大家的帮助！

是否有任何通知表明iOS会将设备置于“睡眠”状态？

5 个答案: