MGLCoordinateBounds-MKMapRect.m

- (MKMapRect)visibleMapRect {
    MGLCoordinateBounds bounds = self.mapboxMapView.visibleCoordinateBounds;
    MKMapPoint sw = MKMapPointForCoordinate(bounds.sw);
    MKMapPoint ne = MKMapPointForCoordinate(bounds.ne);

    double x = sw.x;
    double y = ne.y;

    double width = ne.x - sw.x;
    double height = sw.y - ne.y;

    if (width < 0) {
        width += MKMapSizeWorld.width;
    }
    if (height < 0) {
        height += MKMapSizeWorld.height;
    }

    return MKMapRectMake(x, y, width, height);
}