completion block does not fire for generateGeodatabaseParameters API when app goes to background

ShankaralingamG

Hi,

Can some one explain how to receive callback on the 'completion' block of 'generateGeodatabaseParameters' API of an AGSGDBSyncTask ?

I have even enabled 'background Fetch' capability in my project settings, and also have set 'allowCallbackWhenAppInBackground' property of AGSGDBSyncTask to true.

If the app goes into background, the callback does not fire, even after the task has downloaded the geoDB completely.

DiveshGoyal

Have you looked at the OfflineFeatureEditing sample? It does the background download and posts a notification in the completion handler -

‌

The key is to handle the background fetch events in the app delegate. The sample provides a convenience class called BackgroundHelper that you can reuse in your own app  -

//This will get called periodically by the system when the app is background'ed if
//the app declares it supports "Background Fetch" capability in XCode project settings
- (void) application:(UIApplication *)application performFetchWithCompletionHandler:(void (^)(UIBackgroundFetchResult))completionHandler{
    [BackgroundHelper checkJobStatusInBackground:completionHandler];
}


- (void)application:(UIApplication *)application handleEventsForBackgroundURLSession:(NSString *)identifier completionHandler:(void (^)())completionHandler {
    [BackgroundHelper downloadJobResultInBackgroundWithURLSession:identifier completionHandler:completionHandler];
}