iOS ZBarSDK如何检测用户何时关闭QR扫描仪（ViewController）

Question

在我的代码中，我初始化ZBarReaderViewController 以进行二维码扫描。

我需要检测用户何时退出 QR 扫描 进程而不扫描任何二维码。 有什么方法可以知道用户何时退出该进程（通过单击视图中的取消按钮）并在 ZBarReaderViewController 被解雇后立即执行某些操作？

提前谢谢你。任何信息都非常感谢！

下面是我通过点击按钮触发二维码扫描过程的代码。

-(IBAction)nextBtn:(id)sender{

     NSLog(@"trigger QR CODE");

     if(!reader)
     {
         reader = [[ZBarReaderViewController alloc]init];
         reader.readerDelegate = self;
         reader.supportedOrientationsMask = ZBarOrientationMaskAll;

         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];

         UIView * infoButton = [[[[[reader.view.subviews objectAtIndex:2] subviews] objectAtIndex:0] subviews] objectAtIndex:3];

         [infoButton setHidden:YES];
     }

     // present and release the controller
     [self.view addSubview:spinner];
     [self.view setUserInteractionEnabled:NO];
     [spinner startAnimating];

     [self presentViewController:reader animated:YES completion:NULL];

}

这是我在用户扫描二维码时捕获二维码的方式。

- (void) imagePickerController: (UIImagePickerController*) imageReader
  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;


     NSString *receiptData = [NSString stringWithFormat:@"%@@-!-@%@", amountLabel.text, receiptLabel.text];

     isClosed = YES;
     NSLog(@"Completion");
     [reader dismissViewControllerAnimated:YES completion:^{
         [self BPUpdateTokenCollection:receiptData qrData:symbol.data];
         [reader.readerView stop];
          for(UIView *subViews in reader.view.subviews)
             [subViews removeFromSuperview];
         [reader.view removeFromSuperview];
         reader.view = nil;
         reader = nil;

      }];
  }

Answer 1

试试这个

@protocol ZBarReaderDelegate <UIImagePickerControllerDelegate>



ZBarReaderDelegate is nothing but UIImagePickerControllerDelegate

- (void) imagePickerControllerDidCancel: (UIImagePickerController*) picker{

    //Cancelled 

    //Do your stuff here


}