Is is possible to show layers that need to be authenticated while in offline?

Question

I have a map with a set of layers consisting of two AGSVectorTiledLayers and seven AGSGroupLayers.

I currently authenticate by login in with a username and password. When I'm online, I have no problems viewing every set of layers.

However, there is one set of AGSGroupLayer that is only viewable AFTER you login. When I try to download the map for offline use, all layers and basemaps show up except the AGSGroupLayer that needs credentials. Is it possible to download this layer group for offline use or can it only be used while online?

For reference, I download the layers by using an offlineTileJob, offlineVectorTileJob, and AGSOfflineMapTask. I can post whatever code is needed, just want to know if it's possible to even do this. I felt like at one point I had these layers showing up offline, but I haven't been able to replicate it.

ThomasKellough · Answer

I do get some errors after AGSGenerateOfflineMapJob completes, but they are not entirely helpful.

I'm using the example on the Arc GIS iOS Runtime Docs.

...
if let result = result {
    log.verbose("Finished downloading!: \(result)")
    if let layerErrors = result.layerErrors as? [AGSLayer: Error],
       let tableErrors = result.tableErrors as? [AGSFeatureTable: Error],
       !(layerErrors.isEmpty && tableErrors.isEmpty) {
        let errorMessages = layerErrors.map { "\($0.key.name): \($0.value.localizedDescription)" } +
        tableErrors.map { "\($0.key.displayName): \($0.value.localizedDescription)" }

self.alertUserWithOKDismissal(title: "Offline Map Generated with Errors",
                     message: "The following error(s) occurred while generating the offline map:\n\n\(errorMessages.joined(separator: "\n"))")
    }
    completionHandler(true)
} else if let error = error {
    log.error("Error downloading the offline map: \(error)")
    completionHandler(false)
}
...

and I get the following...

Nicholas-Furness · Answer

It certainly sounds like everything's set up correctly.

When you get the AGSGenerateOfflineMapResult once the AGSGenerateOfflineMapJob completes, is hasErrors true? If so, what errors are provided in the layerErrors dictionary?

Nicholas-Furness · Answer

Hi Thomas.

When you're working with an already downloaded offline map, there's no authentication (authentication happens when accessing the services), so you won't see the Authentication Manager workflow in play.

Note, that has changed slightly as of 100.9, in that you can download an offline map that contains references to online layers which can be used if there's a network connection (e.g. traffic, or weather). However, that's not happening in this case.