CODEWITHSUNDEEP
iosswifttabsuitabbarcontroller
Shaheen Sharifian
Shaheen Sharifian

Reputation: 59

How to send NSNotifications between tabs using UITabBarController (Swift)

Right now I have two tabs: Tab #1 Has a map and a pinned location. Tab #2 Has the address of the pinned location.

What I want to happen is that when I delete the pin on tab #1, the data on tab #2 should be set to nothing. However, what happens is that the information is still present on the 2nd tab even after I delete the pin.

Here is my code for tab #1:

@IBAction func trashButtonSelected(sender: AnyObject) {
        // Remove from NSDefaults
        // Show alertview
        let alertController = UIAlertController(title: "Are you Sure?", message: "Do you wish to delete your pinned Location?", preferredStyle: .ActionSheet);
        let cancelAction = UIAlertAction(title: "Cancel", style: .Cancel) { (Action) in
            // Cancel
        }
        let deleteButton = UIAlertAction(title: "Delete", style: .Destructive) { (Action) in
            NSUserDefaults.standardUserDefaults().removeObjectForKey("pinnedLocation");
            NSNotificationCenter.defaultCenter().postNotificationName("reloadData", object: nil);
            self.map.removeAnnotations(self.map.annotations);
            self.pinLocationButton.enabled = true;
        }
        alertController.addAction(deleteButton);
        alertController.addAction(cancelAction);
        self.presentViewController(alertController, animated: true, completion: nil);

So I send a notification called reloadData that should reset all the data on tab #2.

here is my code for tab #2:

in my viewDidLoad method I have:

NSNotificationCenter.defaultCenter().addObserver(self, selector: "reloadData:", name: "reloadData", object: nil);

And then in my selector method:

func reloadData(notification:NSNotification) {
    smallMapView.removeAnnotations(smallMapView.annotations);
    smallMapView.showsUserLocation = true;
    let location = locationManager.location;
    let latitude = location!.coordinate.latitude;
    let longitude = location!.coordinate.longitude;
    let latDelta:CLLocationDegrees = 0.001;
    let longDelta:CLLocationDegrees = 0.001;

    let span: MKCoordinateSpan = MKCoordinateSpanMake(latDelta, longDelta);
    let overallLoc = CLLocationCoordinate2DMake(latitude, longitude);
    let region:MKCoordinateRegion = MKCoordinateRegionMake(overallLoc, span);
    self.smallMapView.setRegion(region, animated: true)
    completeAddressPinned = "NO ADDRESS INFO"

}

Any help would be greatly appreciated!

Upvotes: 1

Views: 253

Answers (1)

Mahmoud
Mahmoud

Reputation: 41

In your tab#2: you should add the observer on the init method not on viewDidload method :

required init(coder aDecoder: NSCoder) {
    super.init(coder: aDecoder)!

 NSNotificationCenter.defaultCenter().addObserver(self,selector:#selector(self.shouldReloadFavoritPost(_:)),name:"shouldReloadFavorit",object:nil)
}

Upvotes: 2

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