ios - 应用程序 :didReceiveLocalNotification: not called when app in background

Question

当我的应用程序进入后台时，系统会自动调用 applicationDidEnterBackground 并在该方法中触发本地通知。但是 didReceiveLocalNotification: 方法没有被调用

- (void)applicationDidEnterBackground:(UIApplication *)application {

UIApplication *app = [UIApplication sharedApplication];
bgTask = [app beginBackgroundTaskWithExpirationHandler:^{
    bgTask = UIBackgroundTaskInvalid;
}];

UILocalNotification* localNotification = [[UILocalNotification alloc] init];
localNotification.timeZone = [NSTimeZone defaultTimeZone];
localNotification.fireDate = [NSDate date];
localNotification.alertBody = textString;
localNotification.alertAction = @"View";
localNotification.soundName = UILocalNotificationDefaultSoundName;
localNotification.applicationIconBadgeNumber =  1;

[[UIApplication sharedApplication] presentLocalNotificationNow:localNotification];
}

Answer 1

您对本地通知的期望不正确:

当您的应用进入后台时，您会在手机上看到一条即时通知，但您必须点击该通知才能触发 didReceiveLocalNotification 委托(delegate)。

如果您在前台收到本地通知，则会自动触发 didReceiveLocalNotification。

以上场景已经过测试和验证。

更新:您必须阅读此文档: http://www.thekspace.com/home/component/content/article/62-uilocalnotification-demystified.html