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POUISearchDisplayController causes crash after viewDidUnload
 

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  1. POUISearchDisplayController causes crash after viewDidUnload
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    <p>I have a project using StoryBoards and <code>UISearchDisplayController</code> used in the context of a <code>UINavigationController</code>, that appears in the root viewcontroller. When I push a new view controller onto the stack and I cause a simulated memory warning (or actually get a low memory warning). The previous view controller successfully unloads its view. However, when I pop the second view controller off of the stack I get an <code>EXC_BAD_ACCESS</code>. I turned on NSZombies and discovered this:</p> <blockquote> <p>[UISearchDisplayController retain]: message sent to deallocated instance 0xb13aa30</p> </blockquote> <p>I am not (at least in my code) sending that message to the <code>UISearchDisplayController</code>. I am not doing anything, programmatically speaking, with it. Break points reveal that I am not even making it into the <code>viewDidLoad</code> of the first view controller.</p> <p>Something curious, though: for laughs and giggles I decided to outright <code>retain</code> the SDC in my <code>viewDidLoad</code>, just to see what would happen and no crash occurs. However, my <code>UISearchDisplayController</code> instance is <code>nil</code>.</p> <p>I did a backtrace and get this output:</p> <pre><code>#0 0x01e30e1e in ___forwarding___ () #1 0x01e30ce2 in __forwarding_prep_0___ () #2 0x01dd1490 in CFRetain () #3 0x01eb69c0 in +[__NSArrayI __new::] () #4 0x01e0a00a in -[__NSPlaceholderArray initWithObjects:count:] () #5 0x01e34f52 in +[NSArray arrayWithObjects:count:] () #6 0x01e5e084 in -[NSDictionary allValues] () #7 0x01035272 in -[UINib instantiateWithOwner:options:] () #8 0x00edce2c in -[UIViewController _loadViewFromNibNamed:bundle:] () #9 0x00edd3a9 in -[UIViewController loadView] () #10 0x00edd5cb in -[UIViewController view] () #11 0x00edd941 in -[UIViewController contentScrollView] () #12 0x00eef47d in -[UINavigationController _computeAndApplyScrollContentInsetDeltaForViewController:] () #13 0x00eef66f in -[UINavigationController _layoutViewController:] () #14 0x00eef93b in -[UINavigationController _startTransition:fromViewController:toViewController:] () #15 0x00ef03df in -[UINavigationController _startDeferredTransitionIfNeeded] () #16 0x00ef16cb in _popViewControllerNormal () #17 0x00ef196c in -[UINavigationController _popViewControllerWithTransition:allowPoppingLast:] () #18 0x0b446e82 in -[UINavigationControllerAccessibility(SafeCategory) _popViewControllerWithTransition:allowPoppingLast:] () #19 0x00ef0b10 in -[UINavigationController popViewControllerAnimated:] () #20 0x00ef297d in -[UINavigationController navigationBar:shouldPopItem:] () #21 0x00e7dabe in -[UINavigationBar _popNavigationItemWithTransition:] () #22 0x00e7da49 in -[UINavigationBar popNavigationItemAnimated:] () #23 0x0b42208c in -[UINavigationBarAccessibility(SafeCategory) popNavigationItemAnimated:] () #24 0x00e80507 in -[UINavigationBar _handleMouseUpAtPoint:] () #25 0x00e8074c in -[UINavigationBar touchesEnded:withEvent:] () #26 0x00e3fa30 in -[UIWindow _sendTouchesForEvent:] () #27 0x00e3fc56 in -[UIWindow sendEvent:] () #28 0x00e26384 in -[UIApplication sendEvent:] () #29 0x00e19aa9 in _UIApplicationHandleEvent () #30 0x02d37fa9 in PurpleEventCallback () #31 0x01e9e1c5 in __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE1_PERFORM_FUNCTION__ () #32 0x01e03022 in __CFRunLoopDoSource1 () #33 0x01e0190a in __CFRunLoopRun () #34 0x01e00db4 in CFRunLoopRunSpecific () #35 0x01e00ccb in CFRunLoopRunInMode () #36 0x02d36879 in GSEventRunModal () #37 0x02d3693e in GSEventRun () #38 0x00e17a9b in UIApplicationMain () #39 0x00002b72 in main (argc=1, argv=0xbffff620) </code></pre> <p>There doesn't appear to be anything really interesting there (is there ever? :P) and appears to be all internals to Apple's stuff. Any ideas on how to get this problem to go away?</p> <p><strong>UPDATE:</strong> Even when I remove the connection between my view controller and the property for the Search Display Controller but create my own <code>IBOutlet</code> for it, it still crashes. Bad bug perhaps?</p> <p><strong>UPDATE 2:</strong> When I programmatically create my own instance of a <code>UISearchDisplayController</code> (not through the storyboard) and create it in <code>viewDidLoad</code>, everything works the way it is supposed to.</p> <p><strong>UPDATE 3:</strong> I am able to consistently reproduce this problem in a new project with a storyboard. I did the same thing using a vanilla nib and everything worked the way it was suppose to. However, if I setup the same thing using a storyboard and segue, it blows up just like it does in my real project. :(</p> <p><strong>RECAP</strong>: Here are the steps in recreating this issue:</p> <ol> <li>Create a view controller in a storyboard with a <code>UISearchDisplayController</code></li> <li>Push a new view controller on the navigation stack</li> <li>Cause a low memory warning</li> <li>Pop the controller off of the stack</li> <li><em><strong>KABOOM!</em></strong></li> </ol> <p><code>viewDidLoad</code> does not even get called on the first view controller at this point, Apple's code blows up before then.</p>
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    1. COWhat does your viewDidUnload method look like?
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    2. CO@aopsfan Just nil'ing out my `IBOutlets` and calling my super's implementation of `viewDidUnload`.
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    3. COwhat happens if you remove that code?
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