Resetting zone allocator with allocations still alive

Question

I'm receiving the following message in XCode 10.2.1 after my ViewController with a MKMapView gets de-initialized.

[Memory] Resetting zone allocator with 24 allocations still alive

I'm using the following code in the ViewController to clean-up the MKMapView. It doesn't seem to matter if I do this or remove the delegate in the ViewDidDisappear event.

deinit {
    self.mapView.delegate = nil
}

Is this indicating an actual memory leak or something else I need to fix? It doesn't appear to be leaking memory after opening/closing the ViewController multiple times.

Answer 1

Calling mapView.removeAnnotations(mapView.annotations) in the deinit fixed it for me. It was occurring only if there were clustered annotations and the map was being zoomed or panned right before deallocation.