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    <hr> <p><strong>NOTE:</strong> As of iOS 7.1, you should be using <a href="https://developer.apple.com/library/ios/documentation/MediaPlayer/Reference/MPRemoteCommandCenter_Ref/" rel="nofollow">MPRemoteCommandCenter</a> instead of the answer below. </p> <p>You create various system-provided subclasses of <a href="https://developer.apple.com/library/ios/documentation/MediaPlayer/Reference/MPRemoteCommand_Ref/index.html#//apple_ref/swift/cl/c:objc(cs)MPRemoteCommand" rel="nofollow">MPRemoteCommand</a> and assign them to properties of the <code>[MPRemoteCommandCenter sharedCommandCenter]</code>.</p> <p>I'm keeping the rest of this around for historical reference, but the following is not guaranteed to work on recent iOS versions. In fact, it just might not.</p> <hr> <p>You definitely do need an audio <em>player</em> but not necessarily an explicit <em>session</em> to take control of the remote control events. (<code>AVAudioSession</code> is implicit to any app that plays audio.) I spent a decent amount of time playing with this to confirm this.</p> <p>I've seen a lot of confusion on the internet about where to set up the <code>removeControlEventRecievedWithEvent:</code> method and various approaches to the responder chain. I know this method works on iOS 6 and iOS 7. Other methods have not. Don't waste your time handling remote control events in the app delegate (where they used to work) or in a view controller which may go away during the lifecycle of your app. </p> <p>I made <a href="https://github.com/MosheBerman/ios-audio-remote-control/blob/master/README.md" rel="nofollow">a demo project</a> to show how to do this.</p> <p>Here's a quick rundown of what has to happen:</p> <ol> <li><p>You need to create a subclass of <code>UIApplication</code>. <em>When the documentation says <code>UIResponder</code>, it means <code>UIApplication</code>, since your application class is a subclass of <code>UIResponder</code>.</em> In this subclass, you're going to implement the <code>remoteControlReceivedWithEvent:</code> and <code>canBecomeFirstResponder</code> methods. You want to return <code>YES</code> from <code>canBecomeFirstResponder</code>. In the remote control method, you'll probably want to notify your audio player that something's changed. </p></li> <li><p>You need to tell iOS to use your custom class to run the app, instead of the default <code>UIApplication</code>. To do so, open main.m and change this:</p> <pre><code> return UIApplicationMain(argc, argv, nil, NSStringFromClass([RCAppDel`egate class])); </code></pre> <p>to look like this:</p> <pre><code>return UIApplicationMain(argc, argv, NSStringFromClass([RCApplication class]), NSStringFromClass([RCAppDelegate class])); </code></pre> <p>In my case <code>RCApplication</code> is the name of my custom class. Use the name of your subclass instead. Don't forget to <code>#import</code> the appropriate header.</p></li> <li><p>OPTIONAL: You should configure an audio session. It's not required, but if you don't, audio won't play if the phone is muted. I do this in the demo app's delegate, but do so where appropriate.</p></li> <li><p>Play something. Until you do, the remote controls will ignore your app. I just took an <code>AVPlayer</code> and gave it the URL of a streaming site that I expect to be up. If you find that it fails, put your own URL in there and play with it to your heart's content.</p></li> </ol> <p>This example has a little bit more code in there to log out remote events, but it's not all that complicated. I just define and pass around some string constants. </p> <p>I bet that a silent looping MP3 file would help work towards your goal. </p>
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    1. COWow, thanks! I'll check out the demo when I get home. Now you say the methodology here works in iOS 6 & 7; do you know off the top of your head if it will go as far back as 5.1?
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    2. COI don't know for sure, but I think the breaking changes were between iOS 6 and 7, so I would imagine that it works on iOS 5.
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    3. COI just charged up my iPad running iOS 5 and tried to run the demo on it. At first it wouldn't work, but if you turn off autolayout and the iOS 6+ localization feature (and copy the unlocalized nib back in) it mostly works. I say mostly because something is wrong with the play/pause button. (I think it's just an event type I didn't account for correctly. Run it and you'll see what I mean.)
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