application：didReceiveLocalNotification：在后台app时不调用

Question

当我的应用程序进入后台时，将自动调用applicationDidEnterBackground，并在此方法中触发本地通知。 但didReceiveLocalNotification ：方法未被调用

- (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：

当您的应用程序进入后台时，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。

以上场景经过测试和验证。

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Answer 2

试试这段代码：

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

在构建通知之前，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];
    }