本地通知未到达

Question

我正在运行宁后台代码检查网站是否有任何变化，如果有变化则本地通知提醒用户。但是，当我运行代码并尝试它时，本地通知不会到达。这是我 appDelegate.m

中的代码

- (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]];
                            }
}

我登录 "Notification sent" 但我没有收到任何通知。是不是少了什么东西或者出了什么问题？我的其他无效操作中没有任何其他代码。

编辑在@rckoenes 说过之后我将我的代码编辑成这个。

- (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];
}

可是，我还是没有收到通知。我在模拟后台获取时收到警告。这是出现在我的 NSLog Warning: Application delegate received call to -application:performFetchWithCompletionHandler: but the completion handler was never called. 中的警告当我模拟后台获取时，这个警告是否正常？我的通知仍然没有出现。我该如何解决？

Answer 1

在 iOS 8+ 中，您必须获得用户的本地通知许可。在您的 application didFinishLaunchingWithOptions 方法中添加以下行：

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

本地通知未到达

Local notification not arriving

ios

uilocalnotification