How to download map without portal item

Anonymous User

I am following this example: https://developers.arcgis.com/ios/latest/swift/sample-code/generate-offline-map/ for downloading a map to an iOS device as a mobile map package. Rather than using a portal item like this:

I want to use a regular map from a map view (my particular use case has the map being created in iOS, with the llayers added on programmatically. This means it would look like this:

The issue I am having is that the parameters in the offline map task are empty when using an online map, whereas they are populated when using a portal item:

I am not sure why this is, any help would be greatly appreciated.

Nicholas-Furness

Hi.

This is not something the offline map task supports. The offline map task is centered on a web map as the source:

The map must be a web map either on ArcGIS Online or an on-premises ArcGIS Portal.

To download what you've built in code, you can do one of two things:

• Save the map you created in code as a web map, and create the offline map task from that.
• Download the layers in the map you created in code on a service-by-service basis (so multiple layers from one service is a single GenerateGeodatabase job, each vector tile layer and image time layer is a separate export tile cache job). This is what the offline map task does behind the scenes. But you will need to manage the downloads, and resultant file storage. You will then have a set of local data that you'll need to use to create a map in code each time your app needs the map. As you can see, the offline map task is super helpful here.

If you don't need to keep the data offline, and just want to avoid recreating the map each time in code, you can serialize your AGSMap with toJSON and read it back in with fromJSON.

Hope that helps.