Sample iOS 9.3 app demonstrating background app refresh along with background URL sessions and background tasks.
This sample app is meant to demonstrate using background app refresh in combination with background tasks and background url sessions. It also provides the option of using a default url session instead of a background url session to point out the differences.
The app should be run directly on a device (not in the simulator as it may produce unexpected results) and directly launches into a background app refresh not a foreground app launch.
The key workflow here is:
- Background App Refresh calls through to
application(_:performFetchWithCompletionHandler:)in the AppDelegate - This kicks off a background task, and then begins the download of a single feed
- Upon completing download the single feed a subsequent 20 additional feeds are queued. This mimics a scenario in which a single feed is downloaded to instruct the app what needs to be updated which then prompts many other feed downloads.
- Upon completing all 20 additional feeds everything completes. In a background app refresh scenario because the background task gets an expiration call back, the completion gets run before all 20 have completed resulting in the remaining feeds being downloaded on a background url session. If the app is relaunched after some time the call backs for the remaining feeds will be called.
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