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POQLPreviewController works on iOS 6; not on iOS 7
 

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    <p>I've reviewed other posts regarding <code>QLPreviewController</code> not working under certain conditions. This one has me stymied:</p> <p><code>RHBlobCollection</code>and <code>RHBlobView</code> are model/view objects that respectively hold the collection of, and the individual displayable files, cached ahead of time.</p> <p>RHBlobView.m:</p> <pre><code> - (IBAction) handleBlobTap:(UITapGestureRecognizer *)sender { QLPreviewController *previewController = [[QLPreviewController alloc] init]; // view tag is index in array of blobs [previewController setCurrentPreviewItemIndex:self.tag]; // blobContainer is type RHBlobCollection [previewController setDataSource:self.blobContainer]; UINavigationController *navController = (UINavigationController *)[[[[UIApplication sharedApplication] delegate] window] rootViewController]; [navController pushViewController:previewController animated:YES]; } </code></pre> <p>RHBlobCollection.m:</p> <pre><code> - (NSInteger) numberOfPreviewItemsInPreviewController:(QLPreviewController *)controller { return [self.blobs count]; } - (id &lt;QLPreviewItem&gt;) previewController:(QLPreviewController *)controller previewItemAtIndex:(NSInteger)index { RHBlobView *blob = self.blobs[(NSUInteger) index]; NSURL *fileURL = [RHCacheManager cachedFileURLForFilename:blob.filename withKey:blob.blobID]; // URL proper? BOOL __unused proof1 = [fileURL isFileURL]; // QLPreviewController can stomach it? BOOL __unused proof2 = [QLPreviewController canPreviewItem:fileURL]; // Cached file actually exists? NSString *proof3path = [[fileURL resourceSpecifier] stringByReplacingPercentEscapesUsingEncoding:NSISOLatin1StringEncoding]; BOOL __unused proof3 = [[NSFileManager defaultManager] fileExistsAtPath:proof3path]; // Unless we're dealing with thumbnails, we're done. Return the URL of the resource. if ( ! [blob hasThumbnails] ) { return fileURL; } // Process thumbnails into .pdf file for display... </code></pre> <p><code>proof1</code>, <code>proof2</code> and <code>proof3</code> all return <code>YES</code>. Pulled out into a separate proof-of-concept project, <code>QLPreviewController</code> does as it's supposed to. In my full app project, though, it works under iOS 6 but hangs on "Loading..." with a spinner under iOS 7.</p> <p>My gut tells me that it should have something to do with a malformed file URL or path, but my little tests show everything is copasetic. Has anyone else had a problem with this?</p>
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