QR Code Scanning in ios application

I need to integrate QR-code reader in app and found a tutorial for it.

I downloaded Z-bar sdk from this link.

Here is what I had done.

In the QRscannerViewController.m

-(IBAction)StartScan:(id) sender
{
    ZBarReaderViewController *reader = [ZBarReaderViewController new];
     reader.readerDelegate = self;

     reader.readerView.torchMode = 0;

    ZBarImageScanner *scanner = reader.scanner;
    // TODO: (optional) additional reader configuration here

    // EXAMPLE: disable rarely used I2/5 to improve performance
    [scanner setSymbology: ZBAR_I25
     config: ZBAR_CFG_ENABLE
      to: 0];

     // present and release the controller
     [self presentModalViewController: reader
       animated: YES];
     [reader release];

    resultTextView.hidden=NO;
 }

 - (void) readerControllerDidFailToRead: (ZBarReaderController*) reader
                         withRetry: (BOOL) retry{
     NSLog(@"the image picker failing to read");

 }

 - (void) imagePickerController: (UIImagePickerController*) reader didFinishPickingMediaWithInfo: (NSDictionary*) info
 {


     NSLog(@"the image picker is calling successfully %@",info);
      // ADD: get the decode results
     id<NSFastEnumeration> results = [info objectForKey: ZBarReaderControllerResults];
     ZBarSymbol *symbol = nil;
     NSString *hiddenData;
      for(symbol in results)
       hiddenData=[NSString stringWithString:symbol.data];
      NSLog(@"the symbols  is the following %@",symbol.data);
      // EXAMPLE: just grab the first barcode
     //  break;

      // EXAMPLE: do something useful with the barcode data
      //resultText.text = symbol.data;
      resultTextView.text=symbol.data;


       NSLog(@"BARCODE= %@",symbol.data);