Exercises
1. Enhance the background task processing to download a series of images, or download and process a large JSON file in the background.
2. Add the capability to monitor the GPS for large location changes while the app is in the background, and log the changes as they happen. Refer to Chapter 2, “Core Location, MapKit, and Geofencing,” for more information on location information.
3. Update the audio handling to support the controls shown on the lock screen and Control Center. Hint: Implement the remoteControlReceivedWithEvent: method in the view controller that becomes the first responder.
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