Hello Adrian,
I am not really sure which ID results that you talking about. But here is the screenshot for iOS IdentifyFeatureSample, the AGSIdentifyTask and AGSIDentifyDelegate control the little popup window, if you check the code behind, when click any point on the screen, the breakpoint will hit this method:
- (void)identifyTask:(AGSIdentifyTask *)identifyTask operation:(NSOperation *)op didExecuteWithIdentifyResults:(NSArray *)results
The call out content you can setup based on different parameters that content from your REST or just pure text.
For example, in this screenshot, you can see the stateName return from a query from REST and pure text "Click for more detail":
NSString *stateName = [((AGSIdentifyResult*)[results objectAtIndex:0]).feature attributeAsStringForKey:@"STATE_NAME"];
self.mapView.callout.title = stateName;
self.mapView.callout.detail = @"Click for more detail..";
Here is the API reference for 10.2.3: <AGSIdentifyTaskDelegate> Protocol Reference and AGSIdentifyTask Class Reference
I would suggest to check the link from GitHub about this sample. Download it and try to see the detail IdentifyTaskSample
Hope this can help.
Best Regards,