StackOverflow2013

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6206840
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2011-06-01T19:51:50.547
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2017-05-23T10:34:35.053
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As <a href="https://stackoverflow.com/users/225589/gonzalo-larralde">Gonzalo</a> mentions in the comments, it looks like a notification is being posted with the name <code>BluetoothAvailabilityChangedNotification</code>. Cocoa's notifications system is based around NSNotificationCenter, which maintains a list of observers and forwards notifications based on names, which are simply NSStrings. It is very likely that you can receive notifications if you call: <pre><code>[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(bluetoothAvailabilityChanged:) name:@"BluetoothAvailabilityChangedNotification" object:nil]; </code></pre> And implement the method: <pre><code>- (void)bluetoothAvailabilityChanged:(NSNotification *)notification { // maybe [notification userInfo] has some useful info... } </code></pre> You might not receive any notifications if GameKit is using a separate notification center object. Does this count as private API? I would say it's no worse than parsing your console output. You are not calling methods on undocumented classes, you are passively observing notifications posted with a given name. Of course, Apple's opinion is the only one that matters. If I were in your shoes, I would make sure that: <ol> <li>your app functions correctly if the notification is never posted (because a future iOS might not post it, or you might have to remove the code and resubmit without it);</li> <li>your app makes no assumptions about the NSNotification's <code>object</code> or contents of its <code>userInfo</code> dictionary (because whatever they contain today might change in the future).</li> </ol> Alternatively, you could figure out a way to intercept your own app's STDOUT and STDERR (any solution that works on generic UNIX may work on iOS) and watch the text for relevant log messages.
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1. PODelegate is logging non-public events through my app: can those events be detected?
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