Cancel button action in zbar shows blank view - ios

Question

I am using tab bar in my iOS app. When I tap on the scan tab, i invoked the delegate method to start the camera immediately on scan tab. When I start the camera to scan the QR Code and tap on cancel button before scanning, I get the blank view. How to display the view when camera is dismissed
- (void) openCameraScanner
{
ZBarReaderViewController *reader = [[ZBarReaderViewController alloc] init];
reader.readerDelegate = self;
reader.supportedOrientationsMask = ZBarOrientationMaskAll;
reader.showsZBarControls = YES;
ZBarImageScanner *scanner = reader.scanner;
[scanner setSymbology: ZBAR_I25
config: ZBAR_CFG_ENABLE
to: 0];
[self presentViewController:reader animated:YES completion:nil];
reader.showsZBarControls = YES;
//reader.cameraOverlayView = [self commonOverlay];
}
- (void) imagePickerController: (UIImagePickerController*) reader
didFinishPickingMediaWithInfo: (NSDictionary*) info
{
// ADD: get the decode results
id<NSFastEnumeration> results =
[info objectForKey: ZBarReaderControllerResults];
ZBarSymbol *symbol = nil;
for(symbol in results)
// EXAMPLE: just grab the first barcode
break;
// EXAMPLE: do something useful with the barcode data
//resultsView.text = symbol.data;
NSString *urlString = symbol.data;
NSURL *url = [NSURL URLWithString:urlString];
NSLog(#"Query after scan = %#", [url query]);
//Extract id from URL which is there in QR Code --- start
NSMutableDictionary *dictionary = [[NSMutableDictionary alloc] init];
for(NSString *param in [urlString componentsSeparatedByString:#"&"])
{
NSArray *elements = [param componentsSeparatedByString:#"="];
if([elements count]<2)
continue;
[dictionary setObject:[elements objectAtIndex:1] forKey:[elements objectAtIndex:0]];
NSLog(#"value is == %#", [elements objectAtIndex:1]);
//Extract id from URL which is there in QR Code --- end
if([[elements objectAtIndex:1] intValue])
{
NSUserDefaults *defaultsForAsk = [NSUserDefaults standardUserDefaults];
idToAsk = [NSString stringWithFormat:#"%d",[[elements objectAtIndex:1] intValue]];
[defaultsForAsk setObject:idToAsk forKey:#"IDTOASKVIEW"];
flagToShowView = YES;
listViewCntrl.getFlag = flagToShowView;
[self viewDidLoadForDynamicFields];
}
else if([elements objectAtIndex:1] == [NSNull null])
{
[reader dismissViewControllerAnimated:YES completion:Nil];
UIAlertView *message = [[UIAlertView alloc] initWithTitle:#"Invalid QR Code scanned" message:#"Please scan Collaborator's QR Code" delegate:self cancelButtonTitle:#"OK" otherButtonTitles:nil];
[message show];
}
}
image.image =
[info objectForKey: UIImagePickerControllerOriginalImage];
// ADD: dismiss the controller (NB dismiss from the *reader*!)
//[reader dismissViewControllerAnimated:YES completion:nil];
[reader dismissViewControllerAnimated:YES completion:Nil];
}

Answer 1

You can re display the view using -(void)viewWillAppear:(BOOL)animated method of your ViewController class.