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copied!<p>My understanding is as follows (I'm in the process of writing an application that relies on this API, but haven't completed this component enough to start testing):</p> <ol> <li>Your application is run for the first time, you register to <strong>startMonitoringSignificantLocationChanges</strong>, and provide a callback function. While your application is running, it will call that callback whenever it receives a significant change.</li> <li>If your application is put to the background, UIApplication will receive <strong>applicationWillResignActive</strong>, followed by <strong>applicationDidEnterBackground</strong>.</li> <li>If your application is killed while it is suspended in the background, you will not be notified; however, if your application is killed while it is running (foreground or background to my knowledge), you will get a moment with <strong>applicationWillTerminate</strong>. You cannot request extra background time from this function.</li> <li><p>Despite being killed in the background, the OS will relaunch your application. If your application is simply launched by the OS for a change, you will get a call to <strong>application didFinishLaunchingWithOptions</strong>:</p> <pre><code>if ([launchOptions objectForKey:UIApplicationLaunchOptionsLocationKey]) </code></pre> <p>will help you determine if you've come back from a background location change.</p></li> <li>If, instead, you were currently running in the background, and your app is manually relaunched by the user, you will receive an <strong>applicationWillEnterForeground</strong> followed by <strong>applicationDidBecomeActive</strong>.</li> <li><s>Regardless of how it happened, when your application is relaunched (unless it was still running in the background as a result of a background task and said task had started monitoring changes), you need to explicitly tell it to <strong>startMonitoringSignificantLocationChanges</strong> again because the callback is no longer attached after "freeze drying." And yes, you just need to implement code in didUpdateToLocation once you've re-attached a location handler of some kind once coming back from the suspended state.</s></li> </ol> <p>This is what I'm going on with my code development right now. As I mentioned before, I'm not quite ready to test this on a device so I can't tell if I've interpreted everything correctly, so commenters, please feel free to correct me (though I've done substantial reading on the topic).</p> <p>Oh, and if by some stroke of bad luck, you release an app that does what I want mine to do, I might cry :)</p> <p>Good luck!</p>

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