ZBar SDK (iOS):当我使用子视图时，ZBar不扫描

Question

我已经成功地在其他项目中使用了ZBar，但是在我的最新项目中实现它有问题。它被设置为一个选项卡视图应用程序，其中第一个选项卡是扫描仪，第二个选项卡输出结果。为了解决ZBar使用全屏而不显示选项卡栏的问题，我创建了一个子视图(参见下面的代码)。但是，我在我的其他ZBar项目上也测试了这一点，当您使用子视图时，ZBar不会读取条形码，然后存储编码的数据。相反，动画扫描跟踪器只是四处弹跳。

是否有一些东西，我可以添加到我的代码，将允许我使用ZBar在子视图?或者这是在选项卡应用程序中使用ZBar的错误方式?

下面是我的扫描方法:

- (void) presentReader
{
    ZBarReaderViewController *reader = [ZBarReaderViewController new];
    reader.readerDelegate = self;
    reader.supportedOrientationsMask =     ZBarOrientationMask(UIInterfaceOrientationPortrait);
    reader.showsHelpOnFail = YES;
    NSLog(@"reader presented");
    ZBarImageScanner *scanner = reader.scanner;
    // TODO: (optional) additional reader configuration here
    // EXAMPLE: disable rarely used I2/5 to improve performance
    [scanner setSymbology: 0
               config: ZBAR_CFG_ENABLE
                   to: 0];
    [scanner setSymbology: ZBAR_UPCA
               config: ZBAR_CFG_ENABLE
                   to: 0];
    [scanner setSymbology: ZBAR_DATABAR
               config: ZBAR_CFG_ENABLE
                   to: 1];
    [scanner setSymbology: ZBAR_DATABAR_EXP
               config: ZBAR_CFG_ENABLE
                   to: 1];

    reader.showsCameraControls = NO;  // for UIImagePickerController
    reader.showsZBarControls = NO;
    //reader.cameraFlashMode = UIImagePickerControllerCameraFlashModeAuto;
    reader.wantsFullScreenLayout = NO;
    reader.videoQuality = UIImagePickerControllerQualityTypeIFrame1280x720;
    //Subview
    [self.view addSubview:reader.view];
}

Answer 1

这适用于我在UITabBarController -(图像)http://db.tt/cgVxDd0x

我想你的问题是你没有设置reader.scanCrop.

-(void) viewDidAppear:(BOOL)animated {
    self.reader = [ZBarReaderViewController new];
    self.reader.readerDelegate = self;
    self.reader.enableCache = NO;
    self.reader.showsZBarControls = NO;
    self.reader.wantsFullScreenLayout = NO;
    self.reader.cameraFlashMode = UIImagePickerControllerCameraFlashModeOff;
    self.reader.supportedOrientationsMask = ZBarOrientationMask(UIInterfaceOrientationPortrait);
    ZBarImageScanner *scanner = self.reader.scanner;
    [scanner setSymbology: ZBAR_I25
                   config: ZBAR_CFG_ENABLE
                       to: 0];
    self.reader.scanCrop = CGRectMake(0, 0, 1, 1);
    [self.view addSubview:self.reader.view];
}
- (void) imagePickerController: (UIImagePickerController*) reader didFinishPickingMediaWithInfo: (NSDictionary*) info {
    id<NSFastEnumeration> results = [info objectForKey: ZBarReaderControllerResults];
    ZBarSymbol *symbol = nil;
    for(symbol in results)
        break;
    NSLog(@"%@",symbol.data);
}

Answer 2

我也面临过这样的问题。但是，一旦我把阅读器对象设为全局对象而不是局部对象，这就没问题了