ios - 在应用程序处于后台时获取本地通知

Question

当应用程序在后台时，不会调用 didReceiveLocalNotification。

所以我尝试从 didFinishLaunchingWithOptions 获取通知

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:    (NSDictionary *)launchOptions
{ 
 UILocalNotification *notification = [launchOptions  objectForKey:UIApplicationLaunchOptionsLocalNotificationKey];
//...
}

但我的应用启用了后台模式(使用外部附件通信)单击通知时，不会调用 didFinishLaunchingWithOptions。

还有其他方法可以获取通知吗？

Answer 1

通过检查Apple's document关于通知，它说:

iOS Note: In iOS, you can determine whether an application is launchedas a result of the user tapping the action button or whether thenotification was delivered to the already-running application byexamining the application state. In the delegate’s implementation ofthe application:didReceiveRemoteNotification: orapplication:didReceiveLocalNotification: method, get the value of theapplicationState property and evaluate it. If the value isUIApplicationStateInactive, the user tapped the action button; if thevalue is UIApplicationStateActive, the application was frontmost whenit received the notification.

据我所知，当你的应用程序处于后台运行状态，并且有本地通知时，你不会收到任何方法调用，通知将显示给用户，但如果用户点击通知并因此响应您的应用程序，您将收到 -didReceiveLocalNotification: 电话。