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POUIDocumentInteractionController crashing upon exit
 

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    <p>I have a regular UIButton on my main menu that currently launches a UIViewController; the contents of the corresponding .m file is as follows:</p> <pre><code>-(id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil { self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil]; documentPath = [[NSBundle mainBundle] pathForResource:@"file" ofType:@"pdf"]; NSURL *targetURL = [NSURL fileURLWithPath:documentPath]; document = [UIDocumentInteractionController interactionControllerWithURL: targetURL]; document.delegate = self; [document retain]; return self; } -(UIViewController *)documentInteractionControllerViewControllerForPreview: (UIDocumentInteractionController *) controller { return self; } -(void)documentInteractionControllerDidEndPreview:(UIDocumentInteractionController *)controller { [document autorelease]; } -(void)viewDidLoad { [super viewDidLoad]; [document presentPreviewAnimated: YES]; // ** CRASH ** } -(void)viewDidUnload { [super viewDidUnload]; } -(void)didReceiveMemoryWarning { [super didReceiveMemoryWarning]; } -(BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation { return YES; } -(void)dealloc { [super dealloc]; } </code></pre> <p>My pdf file loads as expected, however when I hit the "done" button the document closes and I am left staring at my blank UIViewController - arguably as expected. But if I hit the navigation "back" button then the app crashes with a bad access error inside my viewDidLoad method, where the call to presentPreviewAnimated is found.</p> <p>If somebody could please take a look, I would be most grateful.</p> <p>(btw, there is no NIB file when this view controller is created. Yes, this in itself is wrong)</p>
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    1. COI think your problem may be with the autorelease you're doing in the delegate (together with the retain in the initWithNib method).
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    2. CO@onnoweb Without the retain it will crash with the following: Line 1: -[__NSCFType presentPreviewAnimated:]: unrecognized selector sent to instance 0x1a32e0 Line 2: *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[__NSCFType presentPreviewAnimated:]: unrecognized selector sent to instance 0x1a32e0' The reason I added the retain was because Apple tell us to in the UIDocumentInteractionControllerDelegate protocol reference.
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    3. COHmm... I use UIDocument quite a bit in one of my apps, don't do a retain and have no issues. What if you move the UIDocument code from initWithNib to viewDidLoad?
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