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    <p>You need to rework your method to work asynchronously, like <code>-openWithCompletionHandler:</code>. It needs to take a block which is invoked when the answer is known and which receives the answer, true or false, as a parameter.</p> <p>Then, the caller should pass in a block that does whatever is supposed to happen after the answer is known.</p> <p>Or, alternatively, you should delay the whole chunk of logic which cares about the photo being in the database. It should be done after the open has completed.</p> <p>You'd have to show more code for a more specific suggestion.</p> <hr> <p>So, you could rework the <code>isPhoto...</code> method to something like:</p> <pre><code>+ (BOOL)checkIfPhoto:(NSString *)photoToCheck isInManagedDocument:(UIManagedDocument *)document handler:(void (^)(BOOL isHere))handler { if (document.documentState == UIDocumentStateClosed) { [document openWithCompletionHandler:^(BOOL success) { handler([Photo isPhoto:photoToCheck here:document.managedObjectContext]); }]; } else handler(NO); } </code></pre> <p>Then you can rework this:</p> <pre><code>- (IBAction)queryFromDatabase:(UIButton *)sender { NSURL *url = [[[NSFileManager defaultManager] URLsForDirectory:NSDocumentDirectory inDomains:NSUserDomainMask] lastObject]; url = [url URLByAppendingPathComponent:@"test"]; UIManagedDocument *defaultDocument = [[UIManagedDocument alloc] initWithFileURL:url]; [checkPhoto checkIfPhoto:@"test" isInManagedDocument:defaultDocument handler:^(BOOL isHere){ if (isHere) { [sender setTitle:@"Okay" forState:UIControlStateNormal]; } else { [sender setTitle:@"NO" forState:UIControlStateNormal]; } }]; } </code></pre>
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    1. POhow to return result after OpenWithCompletionHandler: is complete
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    1. USKen Thomases
    1. USKen Thomases
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    1. COI'm not going to read through your whole project. Show the specific code that cares about the photo being in the database.
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      1. USKen Thomases
    2. COyou are right...:) But, I have no idea how to fix it. can you take a look at this [Test Code](https://docs.google.com/open?id=0B519iRTC07VBUF84ZHVVSVFkcVk)
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      1. USKyle Fang
    3. COI'm so sorry, I didn't meant to post the whole project, I'm not quiet familiar with stackoverflow. I was editing the post and hit return assuming it will start a new line. sorry if it seem rude.;)
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