iOS Backgrounding Walkthroughs
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In this example, we build an iOS Location application that prints information about our current location - latitude, longitude, and other parameters - to the screen. This application will demonstrate how to properly perform location updates while the application is either Active or Backgrounded.
In this walkthrough, we use the Background Transfer Service and
NSURLSession API to kick off downloading a large image that continues to download when the app is in the background.