iOS Set the display of a specific area on the map

[MikhailEgorov]

I have a .mbtiles file that contains only a specific area of the map and its specific tiles. But when I run this file in MapLibre, I see the area I need, and I also see all the other parts of the map shaded in black.
I checked my .mbtiles file in other viewers and everything is displayed correctly there - only the area I need.
I tried to set setVisibleCoordinateBounds in order to exclude the possibility of scrolling empty tiles, but I did not see any changes.
Who knows how to limit the area display on the map so that I can get rid of empty tiles?

[MikhailEgorov]

I found a solution to this in this way, if it will be useful to someone

func mapView(_ mapView: MLNMapView, shouldChangeFrom oldCamera: MLNMapCamera, to newCamera: MLNMapCamera) -> Bool {
let bottomLat = estimatedBottomLatitudeAccurate(from: newCamera, mapView: mapView)

    let minLat: CLLocationDegrees = 66.5456
    let maxLat: CLLocationDegrees = 85.0511
    let centerLon = newCamera.centerCoordinate.longitude

    let isWithinBounds = bottomLat >= minLat &&
                         newCamera.centerCoordinate.latitude <= maxLat &&
                         centerLon >= -180 && centerLon <= 180

    return isWithinBounds

}

private func estimatedBottomLatitudeAccurate(from camera: MLNMapCamera, mapView: MLNMapView) -> CLLocationDegrees {
    let bottomPoint = CGPoint(x: mapView.bounds.midX, y: mapView.bounds.maxY)

    let originalCamera = mapView.camera
    mapView.camera = camera

    let bottomCoordinate = mapView.convert(bottomPoint, toCoordinateFrom: mapView)

    mapView.camera = originalCamera

    return bottomCoordinate.latitude
}

[louwers]

Thanks for sharing!

[MikhailEgorov]

But for myself, I found a way to limit the visibility of the map through a custom UIPanGestureRecognizer. This method eliminates unpredictable behavior at borders.
I like the MapLibre Native project, and if I find more free time, I'd like to contribute to solving some tasks to the MLN for iOS, if that's okay for you.

[louwers]

Yes that would be awesome, the iOS platform can use some love for sure.