How to get the map bounds of a map in a vector tile package?

[MichaelMueller]

when loading a vector tile package (vtpk) into a AGSArcGISVectorTiledLayer and setting it as a AGSBasemap to a AGSMap I want to set the initialViewpoint. The initialViewpoint (AGSViewPoint) should be created from the bounds of the vector tile package. But how can I get the bounds of the vector tile package?

[MichaelMueller · Accepted solution]

got the solution:

let baseLayer = AGSArcGISVectorTiledLayer(url: yourUrl)

let map = AGSMap(basemap: AGSBasemap(baseLayer: baseLayer))

if let mapExtend = baseLayer.fullExtent {                    

   map.initialViewpoint = AGSViewpoint(targetExtent: AGSEnvelope(xMin: mapExtend.xMin, yMin: mapExtend.yMin,    xMax: mapExtend.xMax, yMax: mapExtend.yMax, spatialReference: AGSSpatialReference.wgs84()))

}

[Nicholas-Furness]

Hi Michael Mueller,

One thing to bear in mind is that you need the baseLayer to load before you can read the fullExtent property.

You also don't need to construct a new AGSEnvelope from the one you've already got hold of. Simply pass that into the AGSViewpoint constructor.

Something like this might be more robust:

baseLayer.load() { error in
    guard error == nil else {
        print("Error loading vector tile layer: \(error!.localizedDescription)")
        return
    }
    
    if let extent = baseLayer.fullExtent {
        map.initialViewpoint = AGSViewpoint(targetExtent: extent)
        // Or if the map has already been opened into a mapView
        // in which case the mapView may already have read the
        // map's "initialViewpoint" property…
        // mapView.setViewpoint(AGSViewpoint(targetExtent: extent))
    }
}
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Cheers,

Nick.