应用程序：didReceiveLocalNotification：当应用程序在后台时不调用

Question

当我的应用程序进入后台时，applicationDidEnterBackground 会被自动调用，并且在此方法中我们会触发本地通知。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，您会在手机上看到即时通知，但您必须点击该通知才能触发 didReceiveLocalNotification 委托。

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

Answer 2

试试这个代码：

NSDate *pickerDate = [date_picker date];
// Schedule the notification
UILocalNotification* localNotification = [[UILocalNotification alloc] init];
localNotification.fireDate = pickerDate;
localNotification.alertBody = @"Alert Body Message";
localNotification.alertAction = @"Alert Action Message";
localNotification.timeZone = [NSTimeZone defaultTimeZone];
[[UIApplication sharedApplication]     scheduleLocalNotification:localNotification];

并在 App 委托类的 didFinishLaunchingWithOptions 中使用此代码。

    UILocalNotification *locationNotification = [launchOptions objectForKey:UIApplicationLaunchOptionsLocalNotificationKey];
if (locationNotification) {
    // Set icon badge number to zero
    application.applicationIconBadgeNumber = 0;
}

Answer 3

在安排通知之前，您必须将其注册为指定类型：

    - (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;
    // register notification settings
    if ([application respondsToSelector:@selector(registerUserNotificationSettings:)]) {
#ifdef __IPHONE_8_0
  UIUserNotificationSettings *settings = [UIUserNotificationSettings settingsForTypes:(UIRemoteNotificationTypeBadge
      |UIRemoteNotificationTypeSound
      |UIRemoteNotificationTypeAlert) categories:nil];
  [application registerUserNotificationSettings:settings];
#endif
} else {
  UIRemoteNotificationType myTypes = UIRemoteNotificationTypeBadge | UIRemoteNotificationTypeAlert | UIRemoteNotificationTypeSound;
  [application registerForRemoteNotificationTypes:myTypes];
}

    [[UIApplication sharedApplication] presentLocalNotificationNow:localNotification];
    }