topic Tasks for offline layers? in ArcGIS Runtime SDK for iOS Questions

Tasks for offline layers?

RickJones — Thu, 02 Jun 2011 13:02:14 GMT

We need our app to function offline, so I've employed OfflineTiledLayer and OnlineOfflineFeatureLayer from here.
The feature layers display properly in each mode, however any Tasks (IdentifyTask, QueryTask, etc) require a Url (which means it must be online for it to work). I've tested this and just get an error connecting to the server.
I was using the IdentifyTask demo logic (which worked great) until I took away the internet.

Replacing the IdentifyTask logic with didClickAtPoint, and parsing the graphics collection works offline AND online, but the tolerance is too great (fat finger effect).
Also, we would like to be able to use QueryTask, Routing in the future.

Is there something I'm missing in the library or the above classes that would make this work?

Re: Tasks for offline layers?

DiveshGoyal — Tue, 07 Jun 2011 18:05:40 GMT

Rick, you are not missing anything. The API primarily works in connected mode - most of the heavy lifting is done on a remote server. The tasks take in a URL because they are just proxies to the capabilities on the server. They don't provide any functionality when the device is offline.

Re: Tasks for offline layers?

RickJones — Tue, 14 Jun 2011 17:26:54 GMT

Thank you for confirming that.

What I ended up doing was loading the OnlineOffline layers, but configuring the Tasks to use the URL for their corresponding Maplayer services.

Re: Tasks for offline layers?

MattDenton — Wed, 11 Feb 2015 16:17:23 GMT

Divesh Goyal, is this still true in 10.2.4 and later? The reason I ask is because this blog makes it seem like the API should be online/offline agnostic.

Re: Tasks for offline layers?

DiveshGoyal — Wed, 11 Feb 2015 17:18:49 GMT

Matt, Thanks for asking. We've added many offline capabilities to the SDK since that post in 2011, and these offline capabilities are available in 10.2.4. You can use the AGSRouteTask to compute routes offline using a Network dataset on the device. You can also use the AGSLocator to geocode/reverse-geocode addresses offline using an Address Locator dataset

More info here - Route task—ArcGIS Runtime SDK for iOS | ArcGIS for Developers and Locator—ArcGIS Runtime SDK for iOS | ArcGIS for Developers

You can also work with maps offline including - basemap tiles and operational features.

Create an offline map—ArcGIS Runtime SDK for iOS | ArcGIS for Developers

Re: Tasks for offline layers?

MattDenton — Wed, 11 Feb 2015 18:43:29 GMT

Thanks for your reply, Divesh. I should have been more clear, but I was asking specifically about the usage pattern for AGSQueryTask and AGSIdentifyTask. I suspect but am not sure if those tasks are still facades to easily interact with the server (and do not support offline).

Otherwise, thanks for the links, I will check them out!

Re: Tasks for offline layers?

DiveshGoyal — Thu, 12 Feb 2015 00:04:32 GMT

Yes, those tasks still need the server.