本地通知未到達

我正在運行後臺代碼來檢查網站是否有任何更改，以及是否有更改本地通知以提醒用戶。但是，當我運行代碼並嘗試出局部通知沒有到達。這是我appDelegate.m本地通知未到達

- (void)applicationDidEnterBackground:(UIApplication *)application { 
    NSLog(@"Has Entered Background"); 
    timerCountDown = [NSTimer scheduledTimerWithTimeInterval:60.0 target:self selector:@selector(backGroundParsing) userInfo:nil repeats:YES]; 
} 

- (void)backGroundParsing { 
    //This is where my background checking happens. I deleted the code here to make it shorter. 
    if (totalNumberOfEvents > totalNumberOfEvetsRecorded) { 
           NSLog(@"Notificatoin sent"); 
           NSString *finalNumberOfEventsRecorded = [NSString stringWithFormat:@"%d",totalNumberOfEvents]; 
           NSUserDefaults *userDefaults = [NSUserDefaults standardUserDefaults]; 
           [userDefaults setObject:finalNumberOfEventsRecorded forKey:@"finalRegisteredNumberOfEvents"]; 
           UILocalNotification *notifyUserAboutNewEvent = [[UILocalNotification alloc] init]; 
           [notifyUserAboutNewEvent setFireDate:[NSDate dateWithTimeIntervalSinceNow:1]]; 
           [notifyUserAboutNewEvent setTimeZone:[NSTimeZone defaultTimeZone]]; 
           [notifyUserAboutNewEvent setAlertBody:@"New event has been organised"]; 
           [[UIApplication sharedApplication] setScheduledLocalNotifications:[NSArray arrayWithObject:notifyUserAboutNewEvent]]; 
          } 
}

代碼我做日誌「發送通知」，但我沒有收到任何通知。有什麼缺失或錯誤？我的其他無效操作中沒有任何其他代碼。

編輯在@rckoenes說過我編輯了我的代碼之後。

- (void)application:(UIApplication * _Nonnull)application 
performFetchWithCompletionHandler:(void (^ _Nonnull)(UIBackgroundFetchResult result))completionHandler { 
    [self backGroundParsing]; 
} 

- (void)backGroundParsing { 
    //This is where my background checking happens. I deleted the code here to make it shorter. 
          if (totalNumberOfEvents > totalNumberOfEvetsRecorded) { 
           NSLog(@"Notificatoin sent"); 
           NSString *finalNumberOfEventsRecorded = [NSString stringWithFormat:@"%d",totalNumberOfEvents]; 
           NSUserDefaults *userDefaults = [NSUserDefaults standardUserDefaults]; 
           [userDefaults setObject:finalNumberOfEventsRecorded forKey:@"finalRegisteredNumberOfEvents"]; 
           UILocalNotification *notifyUserAboutNewEvent = [[UILocalNotification alloc] init]; 
           [notifyUserAboutNewEvent setFireDate:[NSDate dateWithTimeIntervalSinceNow:1]]; 
           [notifyUserAboutNewEvent setTimeZone:[NSTimeZone defaultTimeZone]]; 
           [notifyUserAboutNewEvent setAlertBody:@"New event has been organised"]; 
           [[UIApplication sharedApplication] setScheduledLocalNotifications:[NSArray arrayWithObject:notifyUserAboutNewEvent]]; 
          } 
         }); 
    }]; 
    [searchEventsTask resume]; 
}

但是，我仍然沒有收到通知。我在模擬背景獲取時收到警告。這是我的NSLog中出現的警告Warning: Application delegate received call to -application:performFetchWithCompletionHandler: but the completion handler was never called. 當我模擬後臺提取時，此警告是否正常？我的通知仍然不會顯示。我將如何解決它？

來源

2015-10-21 Chandran

您不能在後臺使用用戶計時器。當應用程序進入後臺並使用「fireDate」將通知延遲60秒時，您可以設置「UILocalNotification」。 – rckoenes

但是，如果我不使用計時器，它只會檢查更改只有一次 – Chandran

是的只是從'applicationDidEnterBackground：'調用'backGroundParsing'，它應該工作。 – rckoenes

在iOS 8+中，您必須獲得用戶對本地通知的許可。在您的application didFinishLaunchingWithOptions方法中添加以下行：

[[UIApplication sharedApplication] registerUserNotificationSettings:[UIUserNotificationSettings settingsForTypes:UIUserNotificationTypeAlert|UIUserNotificationTypeBadge| UIUserNotificationTypeSound categories:nil]];

來源

2015-10-21 10:46:31 Nishant

非常感謝。它現在有效 – Chandran

本地通知未到達

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