Local notifications are not firing in ios10

问题:

I'm using UNUserNotificationCenter for ios 10. For testing, I'm setting a local notification for 10 seconds from current time.

This is what I tried,

- (void)viewDidLoad {
    [super viewDidLoad];
     UNUserNotificationCenter *center = [UNUserNotificationCenter currentNotificationCenter];
     [center requestAuthorizationWithOptions:(UNAuthorizationOptionBadge | UNAuthorizationOptionSound | UNAuthorizationOptionAlert)
                          completionHandler:^(BOOL granted, NSError * _Nullable error) {
                              if (!error) {
                                  NSLog(@"request succeeded!");
                                  [self set10Notifs];
                              }
                          }];    
}

-(void) set10Notifs
{
    if (SYSTEM_VERSION_GREATER_THAN_OR_EQUAL_TO(@"10.0")) {
    #if XCODE_VERSION_GREATER_THAN_OR_EQUAL_TO_8
     NSCalendar *calendar = [[NSCalendar alloc] initWithCalendarIdentifier:NSCalendarIdentifierGregorian];

    [calendar setTimeZone:[NSTimeZone localTimeZone]];        

    NSDateComponents *components = [calendar components:NSCalendarUnitTimeZone fromDate:[[NSDate date] dateByAddingTimeInterval:10]];

    UNMutableNotificationContent *objNotificationContent = [[UNMutableNotificationContent alloc] init];
    objNotificationContent.title = [NSString localizedUserNotificationStringForKey:@"Prayer!" arguments:nil];
    objNotificationContent.body = [NSString localizedUserNotificationStringForKey:@"Time now"
                                                                        arguments:nil];
    objNotificationContent.sound = [UNNotificationSound defaultSound];

    UNCalendarNotificationTrigger *trigger = [UNCalendarNotificationTrigger triggerWithDateMatchingComponents:components repeats:NO];


    UNNotificationRequest *request = [UNNotificationRequest requestWithIdentifier:@"Prayer"
                                                                          content:objNotificationContent trigger:trigger];
    UNUserNotificationCenter *userCenter = [UNUserNotificationCenter currentNotificationCenter];
    [userCenter addNotificationRequest:request withCompletionHandler:^(NSError * _Nullable error) {
        if (!error) {
            NSLog(@"Local Notification succeeded");
        }
        else {
            NSLog(@"Local Notification failed");
        }
    }];
#endif
    }
}

I can see the log "Local Notification succeeded". But the local notification is not firing in the device.

In Appdelegate, I added

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
  // Override point for customization after application launch.
    UNUserNotificationCenter *center = [UNUserNotificationCenter currentNotificationCenter];
    center.delegate = self;
    return YES;
}
- (void)userNotificationCenter:(UNUserNotificationCenter *)center
   willPresentNotification:(UNNotification *)notification
     withCompletionHandler:(void (^)(UNNotificationPresentationOptions options))completionHandler {
    NSLog(@"Notification is triggered");
     completionHandler(UNNotificationPresentationOptionBadge);
} 

-(void)userNotificationCenter:(UNUserNotificationCenter *)center didReceiveNotificationResponse:(UNNotificationResponse *)response withCompletionHandler:(void(^)())completionHandler{
    NSLog(@"User Info : %@",response.notification.request.content.userInfo);
    completionHandler();
}

What did I do wrong? Why the app notifications not fired?

回答1:

Set NSDateComponents like:

NSDateComponents *components = [calendar components:NSCalendarUnitYear|NSCalendarUnitMonth|NSCalendarUnitDay|NSCalendarUnitHour|NSCalendarUnitMinute|NSCalendarUnitSecond|NSCalendarUnitTimeZone fromDate:[[NSDate date] dateByAddingTimeInterval:10]];

回答2:

Or use a time trigger instead of a calendar trigger

回答3:

@IBAction func sendNotification(_ sender: Any) {

    let content = UNMutableNotificationContent()
    content.title = "Hello"
    content.body = "Ved Rauniyar !!!"
   // content.badge = 1
    content.sound = UNNotificationSound.default()
    // Deliver the notification in five seconds.
    let trigger = UNTimeIntervalNotificationTrigger.init(timeInterval: 5, repeats: false)
    let url = Bundle.main.url(forResource:"ved", withExtension: "png")
    let attachment = try? UNNotificationAttachment(identifier: "FiveSecond",
                                                   url: url!,
                                                   options: [:])
    content.attachments = [attachment!]
    let request = UNNotificationRequest.init(identifier: "FiveSecond", content: content, trigger: trigger)
    // Schedule the notification.
    let center = UNUserNotificationCenter.current()
    center.add(request) { (error) in
       // print(error!)
    }
}