Mapbox assert at start

[Adraesh]

Environment

• Xcode version: 15.3
• iOS version: 17.4.1
• Devices affected: iPhone 12
• Maps SDK Version: 11.2.0

Observed behavior and steps to reproduce

[Error]: Invalid size is used for setting the map view, fall back to the default size{64, 64}. MapboxMaps/MapView.swift:589: Assertion failed

func updateDrawableSize(to size: CGSize) {
        guard let metalView, !metalView.autoResizeDrawable else { return }

        metalView.bounds.size = size
        mapboxMap.size = size

        metalView.drawableSize = CGSize(width: size.width * pixelRatio, height: size.height * pixelRatio)
        // DrawableSize setter will recalculate `contentScaleFactor` if the new drawableSize doesn't fit into
        // the current bounds.size and scale.
        assert(metalView.contentScaleFactor == pixelRatio)

        // GL-Native will trigger update on `mapboxMap.size` update but it will come in the next frame.
        // To reduce glitches we can schedule repaint in the next frame to resize map texture.
        scheduleRepaint()
    }

Expected behavior

No crash should happen, just like on v11.1.0 of Mapbox SDK.

Our integration (works fine on 11.1.0:

ZStack {
                MapContentView()
                ...
}

import SwiftUI
import MapboxMaps

struct MapContentView: UIViewRepresentable {
    func makeUIView(context: UIViewRepresentableContext<MapContentView>) -> MapView {
        return MapManager.shared().mapView
    }

    func updateUIView(_ uiView: MapView, context: UIViewRepresentableContext<MapContentView>) {
    }
}

class MapManager: NSObject, ObservableObject, GestureManagerDelegate, UIColorPickerViewControllerDelegate {
private static var sharedMapManager: MapManager = {
        let mapManager = MapManager()

        return mapManager
    }()

    class func shared() -> MapManager {
        return self.sharedMapManager
    }

private override init() {
        super.init()

        self.instanciate()
        ...
    }
}
public func instanciate() -> Void {
        MapboxOptions.accessToken = "pk......";

        let centerCoordinate = CLLocationCoordinate2D(latitude: 46, longitude: 0)
        let camera = CameraOptions(center: centerCoordinate, zoom: 9)

        let mapInitOptions = MapInitOptions(cameraOptions: camera);
        self.mapView = MapView(frame: CGRect(x: 0, y: 0, width: 400, height: 400), mapInitOptions: mapInitOptions)
        self.mapView.autoresizingMask = [.flexibleWidth, .flexibleHeight]

        ...
    }
...

Thanks.

[persidskiy]

@Adraesh Hi, thank you for the report, we work on it.

Did you try to use the standard SwiftUI support from the sdk https://docs.mapbox.com/ios/maps/api/11.2.0/documentation/mapboxmaps/map? Would that help with the issue?

[Adraesh]

@persidskiy

Thank you for your prompte answer.

I am not quite sure how to implement the standard SwiftUI along with the architecture which we have already in place since more than 4 years now (before any mapbox swift ui support).

As you saw in my previous code, we have a singleton that holds a reference to the MapView in this way we can interact with the map wherever and whenever we want without being locked by a context.

Using this same approach how would you use the "standard SwiftUI support" and instanciate a Map and retaining a global reference of it?

Is there a way to instanciate a Map() with a MapView object or any related object?

I am missing something here.

[persidskiy]

@Adraesh

As you saw in my previous code, we have a singleton that holds a reference to the MapView in this way we can interact with the map wherever and whenever we want without being locked by a context.

Using this same approach how would you use the "standard SwiftUI support" and instanciate a Map and retaining a global reference of it?

The Map implementation doesn't allow you to use the singleton MapView, as this would break any guarantees on the Map API and generally is unwanted practice.

Is there a way to instanciate a Map() with a MapView object or any related object?

No, if you use Map view in SwiftUI, it wraps most of MapView functionality in declarative way. However, in some rare cases you can access the underlying MapboxMap and other objects available in MapProxy via MapReader https://docs.mapbox.com/ios/maps/api/11.2.0/documentation/mapboxmaps/swiftui-user-guide#Direct-access-to-the-underlying-map-implementation

[persidskiy]

Fixed here https://github.com/mapbox/mapbox-maps-ios/commit/3d59b1e3356151e7fa14311d05ec18fbe7fda899

[Adraesh]

@persidskiy Thank you very much.

Will check the 11.3.0-beta.1

[Adraesh]

It works perfectly. Thank you @persidskiy

[feelingsonice]

@persidskiy I'm also seeing this even though I'm not setting the map's size anywhere in my code nor am I using UIKit. Would you mind explain what this error means? Should I just ignore it since it's now a warning?