topic Re: Check to see if AGSFeatureLayer loaded successfully in ArcGIS Runtime SDK for iOS Questions

Check to see if AGSFeatureLayer loaded successfully

DarrenMackiewicz — Fri, 02 Mar 2012 19:13:46 GMT

If I'm using this syntax to grab a reference to an AGSFeatureLayer, what is the best way to test to see if the layer actually loaded successfully?
I know the way to do this for an AGSDynamicMapServiceLayer, but not for AGSFeatureLayer

Thanks

NSURL* fURL = [NSURL URLWithString: featureLayerURL];
self.activeFeatureLayer = [AGSFeatureLayer featureServiceLayerWithURL:fURL mode: AGSFeatureLayerModeOnDemand];

Re: Check to see if AGSFeatureLayer loaded successfully

NimeshJarecha — Fri, 02 Mar 2012 19:19:12 GMT

If self.activeFeatureLayer.loaded property is TRUE then it is loaded successfully.

Regards,
Nimesh

Re: Check to see if AGSFeatureLayer loaded successfully

DarrenMackiewicz — Fri, 02 Mar 2012 19:32:57 GMT

I'm trying to catch the case where, let's say the Feature Service is not available or turned off.

This happens ....

NSURL* fURL = [NSURL URLWithString: featureLayerURL];
self.activeFeatureLayer = [AGSFeatureLayer featureServiceLayerWithURL:fURL mode: AGSFeatureLayerModeOnDemand];

Then - right here - I want to see if the activeFeatureLayer is valid.

I can only use the self.activeFeatureLayer.loaded property AFTER the didLoadLayerForLayerView delegate fires.

I can test this for a MapService layer, but testing to see if the AGSMapServiceInfo.layerInfos count is > 0, BEFORE I self.mapView.addMapLayer (AGSDynamicMapServiceLayer)

I'd like to do the same thing for the Feature Service - but it doesn't appear to have any properties populated after these two commands are run.

NSURL* fURL = [NSURL URLWithString: featureLayerURL];
self.activeFeatureLayer = [AGSFeatureLayer featureServiceLayerWithURL:fURL mode: AGSFeatureLayerModeOnDemand];

Re: Check to see if AGSFeatureLayer loaded successfully

NimeshJarecha — Fri, 02 Mar 2012 19:43:59 GMT

Okie..so you want to know about the validity of the feature layer before adding it to map. For that you must use synchronous constructor of the feature layer

Q: How to find whether constructor is synchronous or asynchronous?
A: Method which takes "error" parameter are synchronous.

You should initialize AGSFeatureLayer with initWithURL:mode:credential:error: method and then check the loaded property before adding to the map. If it's invalid layer then error object will have some information.

Hope this helps!

Regards,
Nimesh

Re: Check to see if AGSFeatureLayer loaded successfully

DarrenMackiewicz — Fri, 02 Mar 2012 20:11:04 GMT

Conceptually, I'm with you. But I can't find the syntax to do that.....?

Re: Check to see if AGSFeatureLayer loaded successfully

DarrenMackiewicz — Fri, 02 Mar 2012 20:13:01 GMT

Never mind. Found it

self.activeFeatureLayer = [[AGSFeatureLayer alloc] initWithURL:fURL mode:AGSFeatureLayerModeOnDemand error:nError];

Re: Check to see if AGSFeatureLayer loaded successfully

NimeshJarecha — Fri, 02 Mar 2012 20:18:35 GMT

Here is the syntax..

NSError *error = nil;
self.featureLayer = [[AGSFeatureLayer alloc] initWithURL:[NSURL URLWithString:@"url"] mode:AGSFeatureLayerModeOnDemand credential:nil error:&error];

Regards,
Nimesh

Re: Check to see if AGSFeatureLayer loaded successfully

DarrenMackiewicz — Fri, 02 Mar 2012 20:42:17 GMT

The error that I currently have set up is to tell if the service is not available due to a CONNECTIVITY issue.

Is there a way, when I initiate the map service and send credentials (token) - to tell if the Feature Service failed to load due to the credential being wrong, rather than bad connectivity?

Re: Check to see if AGSFeatureLayer loaded successfully

NimeshJarecha — Fri, 02 Mar 2012 21:01:34 GMT

What is the exact error message you get?
Are you working with map service or feature layer?
Is there any security set on the service?

Elaborate your requirements please...

Regards,
Nimesh

Re: Check to see if AGSFeatureLayer loaded successfully

DarrenMackiewicz — Fri, 02 Mar 2012 21:21:42 GMT

Actually, I found a way. I checked for the cred.token length after initializing AGSMapServiceInfo.
If it has a token, It authenticated. If not, No go.

Thanks for your help today!