Mapbox-gl-native: [IOS] : Invalid offline region definition (Crashed)

[ThiyagarajanShivSankaran]

Hi,

I am getting this warning in console,

[DEBUG] {DefaultFileSource}[Database]: Unable to make space for entry

then the app is crashed with exception,

libc++abi.dylib: terminating with uncaught exception of type std::invalid_argument: Invalid offline region definition.

I know there is a seperate issue for [DEBUG] {DefaultFileSource}[Database]: Unable to make space for entry.

But i need some quick fix, please.

Thanks.

[jfirebaugh]

Can you provide the code that creates the offline region that causes this crash?

[ThiyagarajanShivSankaran]

Hi @jfirebaugh ,

Here is the method, i am using to download offline pack,

func startOfflinePackDownload() {

    let mapBound = MGLCoordinateBoundsMake(CLLocationCoordinate2D(latitude: _latSW, longitude: _lngSW), CLLocationCoordinate2D(latitude: _latNE, longitude: _lngNE))

    let region = MGLTilePyramidOfflineRegion(styleURL: mapView.styleURL, bounds: mapBound, fromZoomLevel: mapView.zoomLevel, toZoomLevel: 15)

    // Store some data for identification purposes alongside the downloaded resources.
    let userInfo = ["name": "My Offline Pack"]
    let context = NSKeyedArchiver.archivedData(withRootObject: userInfo)

    // Create and register an offline pack with the shared offline storage object.
    MGLOfflineStorage.shared().addPack(for: region, withContext: context) { (pack, error) in
        guard error == nil else {
            // The pack couldn’t be created for some reason.
            print("Error")
            return
        }

        // Start downloading.
        pack!.resume()
    }
}

And the code is crashing at pack!.resume(). Hey, sorry for the delay @jfirebaugh.

Thanks.

[1ec5]

At the time of the crash, what is mapView's zoomLevel set to?

[ThiyagarajanShivSankaran]

Hi @1ec5,

Initially, self.mapView.zoomLevel = 11. After zooming in to level 15 or 16 and leave the map ideal for some 5 seconds or tapping on a feature it is getting crashed.

And, it is not crashing everytime. One or two times a day.

[1ec5]

OK, the reason I ask is that startOfflinePackDownload() creates an MGLTilePyramidOfflineRegion with a minimum zoom level of mapView.zoomLevel and a maximum zoom level of 15. The minimum zoom level must be no greater than the maximum zoom level; otherwise, an exception will be thrown. Can you verify that the minimum zoom level is correct for the offline pack?

[ThiyagarajanShivSankaran]

OK, the reason I ask is that startOfflinePackDownload() creates an MGLTilePyramidOfflineRegion with a minimum zoom level of mapView.zoomLevel and a maximum zoom level of 15. The minimum zoom level must be no greater than the maximum zoom level; otherwise, an exception will be thrown. Can you verify that the minimum zoom level is correct for the offline pack?

Awesome @1ec5. Thanks you, for your reply.

[jfirebaugh]

Closing as a special case of #7890.

[htinc]

Wee I had the same issue and its just a bad thing now, because if you switch from vector-map to a satellite map, we have to zoom out and in again...