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POUnable to dismiss ZBarReaderViewController in imagePickerController didFinishPickingMediaWithInfo
 

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  1. POUnable to dismiss ZBarReaderViewController in imagePickerController didFinishPickingMediaWithInfo
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    <p>Hi I'm developing a QR code reader app and having so much trouble when dismissing the ZBarReaderViewController. I have a view controller with a button which creates the reader and presents it.</p> <pre><code>- (IBAction)scanAction:(id)sender { ZBarReaderViewController *reader = [ZBarReaderViewController new]; reader.readerDelegate = self; [reader.scanner setSymbology: ZBAR_I25 config: ZBAR_CFG_ENABLE to: 0]; reader.readerView.zoom = 1.0; // [self presentViewController:reader animated:YES completion:nil]; [self presentModalViewController:reader animated:YES]; } </code></pre> <p>Then on the reader's delegate I'm doing this (I commented the results processing lines but I still get the same error):</p> <pre><code>- (void) imagePickerController: (UIImagePickerController*) reader didFinishPickingMediaWithInfo: (NSDictionary*) info { // id&lt;NSFastEnumeration&gt; results = [info objectForKey: ZBarReaderControllerResults]; // // ZBarSymbol *symbol = nil; // NSURL *url; // NSString * textUrl; // // for(symbol in results){ // textUrl = symbol.data; // NSLog(@"%@",textUrl); // url = [NSURL URLWithString:textUrl]; // break; // } // // if (url != nil) { //// NSURLRequest *requestObj = [NSURLRequest requestWithURL:url]; //// [self.webView loadRequest:requestObj]; // [self.urlLabel setText:textUrl]; // } // [reader dismissViewControllerAnimated:NO completion:nil]; [reader dismissModalViewControllerAnimated:YES]; } </code></pre> <p>and this is the error I get randomly:</p> <pre><code>QR reader[10159:907] Warning: Attempt to dismiss from view controller &lt;ViewController: 0x1ed4c930&gt; while a presentation or dismiss is in progress! </code></pre> <p>Sometimes it scans and dismiss without any warning but when I get that warning the reader stays scanning, and the delegate gets called again until no more warnings are showed.</p> <p>I tried some suggestions from other users having the same problem but it won't work in my particular case:</p> <ol> <li>using dismissModalViewController instead of modal view which is deprecated. </li> <li>sorrounding the results processing in the completion block of the dismissViewControllerAnimated method.</li> </ol> <p>Thanks for reading :)</p>
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