Iphone ZBarReaderViewController、视图控制器层次结构和其他

我面临着这个无法解决的问题，很高兴能得到你的帮助

我有一个使用ZBar条形码扫描仪的iphone应用程序。我有一个主视图控制器，只要按下一个按钮就可以调用ZBar扫描仪。一旦扫描仪启动并检测到条形码编号，它就会自动关闭，我会调用结果视图控制器，它会显示一些扫描结果。我的问题是忽略结果视图控制器-出于某种原因，我无法缩小它并以干净的方式返回主视图控制器。我的工作是创建一个主视图控制器的新对象并调用它，这是一个非常糟糕的设计

这是我的代码-感谢任何帮助

在主Viewcontroller中的某个位置调用扫描仪（UIButton操作方法）：

主ViewController中的扫描仪委派方法：

//ZBarSDK Finish Scanning
- (void) imagePickerController: (UIImagePickerController*) reader didFinishPickingMediaWithInfo: (NSDictionary*) info
{
  id<NSFastEnumeration> results = [info objectForKey: ZBarReaderControllerResults];
ZBarSymbol *symbol = nil;
for(symbol in results)
    break;

// EXAMPLE: do something useful with the barcode data

[self dismissModalViewControllerAnimated: YES];

//Calling the Results view controller
Results *resultsViewController = [[Results alloc] initWithNibName:nil bundle:nil];
resultsViewController.tempBarcode = barcode;

UINavigationController *resultsNavigationController = [[UINavigationController alloc] initWithRootViewController:resultsViewController];
resultsNavigationController.modalTransitionStyle = UIModalTransitionStyleCoverVertical;

[[[UIApplication sharedApplication]delegate].window setRootViewController:resultsNavigationController];

 }

ViewController *mainViewController = [[ViewController alloc] initWithNibName:nil bundle:nil];
UINavigationController *mainNavigationController = [[UINavigationController alloc] initWithRootViewController:mainViewController];
mainNavigationController.modalTransitionStyle = UIModalTransitionStyleCoverVertical;    
[self presentModalViewController:mainNavigationController animated:YES];

与：

但如果我这样做，什么也不会发生

在结果视图控制器中，我执行此操作以返回主视图控制器：

//ZBarSDK Finish Scanning
- (void) imagePickerController: (UIImagePickerController*) reader didFinishPickingMediaWithInfo: (NSDictionary*) info
{
  id<NSFastEnumeration> results = [info objectForKey: ZBarReaderControllerResults];
ZBarSymbol *symbol = nil;
for(symbol in results)
    break;

// EXAMPLE: do something useful with the barcode data

[self dismissModalViewControllerAnimated: YES];

//Calling the Results view controller
Results *resultsViewController = [[Results alloc] initWithNibName:nil bundle:nil];
resultsViewController.tempBarcode = barcode;

UINavigationController *resultsNavigationController = [[UINavigationController alloc] initWithRootViewController:resultsViewController];
resultsNavigationController.modalTransitionStyle = UIModalTransitionStyleCoverVertical;

[[[UIApplication sharedApplication]delegate].window setRootViewController:resultsNavigationController];

 }

ViewController *mainViewController = [[ViewController alloc] initWithNibName:nil bundle:nil];
UINavigationController *mainNavigationController = [[UINavigationController alloc] initWithRootViewController:mainViewController];
mainNavigationController.modalTransitionStyle = UIModalTransitionStyleCoverVertical;    
[self presentModalViewController:mainNavigationController animated:YES];

而不仅仅是这样，这是行不通的：

[self dismissModalViewControllerAnimated:YES];

---

谢谢你的耐心

我有一个使用ZBar的类似应用程序。以下是我对您的UIButton方法的模拟：

ZBarReaderViewController *reader = [ZBarReaderViewController new];
UINavigationController *navCntrl1 = [[UINavigationController alloc] initWithRootViewController:reader];
reader.readerDelegate = self;
reader.title = @"Scan Barcode";
reader.supportedOrientationsMask = ZBarOrientationMaskAll;
ZBarImageScanner *scanner1 = reader.scanner;
[scanner1 setSymbology: ZBAR_I25 config: ZBAR_CFG_ENABLE to: 0];
[scanner1 setSymbology: ZBAR_QRCODE config: ZBAR_CFG_ENABLE to: 0];
[self presentModalViewController:navCntrl1 animated:YES];

- (void)scanButtonTapped{
    ZBarReaderViewController *reader = [ZBarReaderViewController new];
    reader.readerDelegate = self;
    reader.supportedOrientationsMask = ZBarOrientationMaskAll;

    ZBarImageScanner *scanner = reader.scanner;

    // I need to scan only QR-codes
    [scanner setSymbology:0 config:ZBAR_CFG_ENABLE to:0];
    [scanner setSymbology:ZBAR_QRCODE config:ZBAR_CFG_ENABLE to:1];
    reader.readerView.zoom = 1.0;

    [self presentModalViewController:reader animated:YES];
    [reader release];
}

这是我的imagePickerController:didFinishPickingMediaWithInfo:

- (void) imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info {
    id<NSFastEnumeration> results = [info objectForKey:ZBarReaderControllerResults];
    ZBarSymbol *symbol = nil;

    for (symbol in results) 
        break;

    // Here I get the QR-code text
    self.qrText = symbol.data;
    NSLog(@"QR-code text = %@",self.qrText);

    // Here I hide scanning View Controller from user
    [picker dismissModalViewControllerAnimated:YES];

    // Here I call QR-code text processing logic
    [self ticketCheckOutLogic];
}

在应用程序中：didFinishLaunchingWithOptions:您可以编写如下内容：

[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(showResultView:)name:@"newBarcodeScanned" object:nil];

- (void)showResultView:(NSNotification *)notification {
     //Calling the Results view controller
     Results *resultsViewController = [[Results alloc] initWithNibName:@"ResultsView" bundle:nil];
     NSDictionary *dict = [notification userInfo];
     resultsViewController.tempBarcode = [dict objectForKey:@"barcodeText"];
     [self presentModalViewController:resultsViewController animated:YES];
}

。。。您的showResultView:可以是这样：

[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(showResultView:)name:@"newBarcodeScanned" object:nil];

- (void)showResultView:(NSNotification *)notification {
     //Calling the Results view controller
     Results *resultsViewController = [[Results alloc] initWithNibName:@"ResultsView" bundle:nil];
     NSDictionary *dict = [notification userInfo];
     resultsViewController.tempBarcode = [dict objectForKey:@"barcodeText"];
     [self presentModalViewController:resultsViewController animated:YES];
}

---

希望有帮助：）

我有一个使用ZBar的类似应用程序。以下是我对您的UIButton方法的模拟：

ZBarReaderViewController *reader = [ZBarReaderViewController new];
UINavigationController *navCntrl1 = [[UINavigationController alloc] initWithRootViewController:reader];
reader.readerDelegate = self;
reader.title = @"Scan Barcode";
reader.supportedOrientationsMask = ZBarOrientationMaskAll;
ZBarImageScanner *scanner1 = reader.scanner;
[scanner1 setSymbology: ZBAR_I25 config: ZBAR_CFG_ENABLE to: 0];
[scanner1 setSymbology: ZBAR_QRCODE config: ZBAR_CFG_ENABLE to: 0];
[self presentModalViewController:navCntrl1 animated:YES];

- (void)scanButtonTapped{
    ZBarReaderViewController *reader = [ZBarReaderViewController new];
    reader.readerDelegate = self;
    reader.supportedOrientationsMask = ZBarOrientationMaskAll;

    ZBarImageScanner *scanner = reader.scanner;

    // I need to scan only QR-codes
    [scanner setSymbology:0 config:ZBAR_CFG_ENABLE to:0];
    [scanner setSymbology:ZBAR_QRCODE config:ZBAR_CFG_ENABLE to:1];
    reader.readerView.zoom = 1.0;

    [self presentModalViewController:reader animated:YES];
    [reader release];
}

这是我的imagePickerController:didFinishPickingMediaWithInfo:

- (void) imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info {
    id<NSFastEnumeration> results = [info objectForKey:ZBarReaderControllerResults];
    ZBarSymbol *symbol = nil;

    for (symbol in results) 
        break;

    // Here I get the QR-code text
    self.qrText = symbol.data;
    NSLog(@"QR-code text = %@",self.qrText);

    // Here I hide scanning View Controller from user
    [picker dismissModalViewControllerAnimated:YES];

    // Here I call QR-code text processing logic
    [self ticketCheckOutLogic];
}

在应用程序中：didFinishLaunchingWithOptions:您可以编写如下内容：

[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(showResultView:)name:@"newBarcodeScanned" object:nil];

- (void)showResultView:(NSNotification *)notification {
     //Calling the Results view controller
     Results *resultsViewController = [[Results alloc] initWithNibName:@"ResultsView" bundle:nil];
     NSDictionary *dict = [notification userInfo];
     resultsViewController.tempBarcode = [dict objectForKey:@"barcodeText"];
     [self presentModalViewController:resultsViewController animated:YES];
}

。。。您的showResultView:可以是这样：

[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(showResultView:)name:@"newBarcodeScanned" object:nil];

- (void)showResultView:(NSNotification *)notification {
     //Calling the Results view controller
     Results *resultsViewController = [[Results alloc] initWithNibName:@"ResultsView" bundle:nil];
     NSDictionary *dict = [notification userInfo];
     resultsViewController.tempBarcode = [dict objectForKey:@"barcodeText"];
     [self presentModalViewController:resultsViewController animated:YES];
}

希望对您有所帮助：）

my delegate method-（void）imagePickerController:（UIImagePickerController*）picker未完成PickingMediaWithInfo:（NSDictionary*）信息未被调用。有任何帮助吗？我的委托方法-（void）imagePickerController:（UIImagePickerController*）picker未完成PickingMediaWithInfo:（NSDictionary*）信息未被调用。有什么帮助吗？