Question

我目前正在开发一款使用ZBarSDK读取QR码的iPad应用程序。

我正在使用ZBarReaderView（非UIViewController），所以我在使用UIView绘制的CGRect中显示前置摄像头（请参阅下面的代码）

我的问题是相机在视野内出现在它的侧面。 iPad应用程序只能在横向模式下开发。

当UIView现在出现时，图像就在它旁边，我不知道如何修复它。我尝试使用CGAffineTransform成功地改变了角度，但是如果iPad被翻转，它将如何处理呢？

我看到其他一些关于这个类似问题的帖子，但没有一个对我有用的决议。值得注意的是我正在使用IOS6，请记住我正在使用ZBarReaderView，因此supportedOrientationsMask不可用。

无论横向是左还是右，我希望用户以垂直位置查看摄像机视图。但是现在，无论转向哪个方向，视频都是侧面的（所以我可以看到自己与侧面成90度）。当屏幕转动时，UIView根本不会改变。我有点失落。

代码：

- (void) viewDidAppear: (BOOL) animated {

    ZBarReaderView * readerView = [ZBarReaderView new];
    ZBarImageScanner * scanner = [ZBarImageScanner new];
    [scanner setSymbology: ZBAR_I25
                   config: ZBAR_CFG_ENABLE
                       to: 0];

    [readerView initWithImageScanner:scanner];
    readerView.readerDelegate = self;
    readerView.tracksSymbols = YES;

    readerView.frame = CGRectMake(20,220,230,230);
    readerView.torchMode = 0;
    readerView.device = [self frontFacingCameraIfAvailable];
    [readerView start];

    [self.view addSubview: readerView];

}

-(void)relocateReaderPopover:(UIInterfaceOrientation)toInterfaceOrientation {
    if (toInterfaceOrientation == UIInterfaceOrientationLandscapeLeft) {
        readerView.previewTransform = CGAffineTransformMakeRotation(M_PI_2);
    } else if (toInterfaceOrientation == UIInterfaceOrientationLandscapeRight) {
        readerView.previewTransform = CGAffineTransformMakeRotation(-M_PI_2);
    } else if (toInterfaceOrientation== UIInterfaceOrientationPortraitUpsideDown) {
        readerView.previewTransform = CGAffineTransformMakeRotation(M_PI);
    } else {
        readerView.previewTransform = CGAffineTransformIdentity;
    }
}

- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
    if (interfaceOrientation == UIInterfaceOrientationLandscapeLeft) {
        return YES;
    } else if (interfaceOrientation == UIInterfaceOrientationLandscapeRight) {
        return YES;
    } else {
        return NO;
    }
}

- (void) willRotateToInterfaceOrientation: (UIInterfaceOrientation) orient
                                 duration: (NSTimeInterval) duration
{
    if (orient == UIInterfaceOrientationLandscapeLeft) {
        [readerView willRotateToInterfaceOrientation: orient
                                            duration: duration];

    }
    if (orient == UIInterfaceOrientationLandscapeRight) {
        [readerView willRotateToInterfaceOrientation: orient
                                            duration: duration];

    }
}

- (BOOL)shouldAutorotate {

    UIInterfaceOrientation orientation = [[UIDevice currentDevice] orientation];

    if (orientation == UIInterfaceOrientationLandscapeLeft) {
        return YES;
    } else if (orientation == UIInterfaceOrientationLandscapeRight) {
        return YES;
    } else {
        return NO;
    }
}

-(NSUInteger) supportedInterfaceOrientations
{
    return UIInterfaceOrientationMaskLandscape;
}

Answer 1

我遇到了同样的问题并且解决了这个问题！

我只需要打电话：

[reader willRotateToInterfaceOrientation: toInterfaceOrientation duration: duration];

在包含ZbarReaderView的视图控制器的willRotate中。

Answer 2

好的，我现在正在开展工作。不知道为什么它现在有效，但这里是readerView部分的结束代码：

readerView = [ZBarReaderView new];
ZBarImageScanner * scanner = [ZBarImageScanner new];
[scanner setSymbology: ZBAR_I25
               config: ZBAR_CFG_ENABLE
                   to: 0];
[readerView initWithImageScanner:scanner];
readerView.readerDelegate = self;

readerView.tracksSymbols = YES;

readerView.frame = CGRectMake(20,220,230,230);
readerView.torchMode = 0;
readerView.device = [self frontFacingCameraIfAvailable];

[self relocateReaderPopover:[self interfaceOrientation]];

[readerView start];

[self.view addSubview: readerView];

注意这一行唯一的真正区别是：

ZBarReaderView * readerView = [ZBarReaderView new];

更改该行已修复初始方向问题。不知道为什么，但确实如此。现在我只需要修改旋转的东西，如果用户旋转iPad。

Answer 3

这对我来说很好：

// ADD: present a barcode reader that scans from the camera feed
ZBarReaderViewController *reader = [ZBarReaderViewController new];
reader.readerDelegate = self;
//reader.supportedOrientationsMask = ZBarOrientationMaskAll;
ScanOverlay *overlayController = [[ScanOverlay alloc] initWithNibName:@"ScanOverlay" bundle:nil];
reader.cameraOverlayView = overlayController.view;
ZBarImageScanner *scanner = reader.scanner;
// TODO: (optional) additional reader configuration here
reader.supportedOrientationsMask = ZBarOrientationMask(UIInterfaceOrientationLandscapeRight||UIInterfaceOrientationLandscapeLeft);
reader.wantsFullScreenLayout = YES;
reader.showsZBarControls = NO;  //If we don't set this to NO, the overlay may not display at all
reader.tracksSymbols = YES;

//支持横向

UIInterfaceOrientation orientation = [UIApplication sharedApplication].statusBarOrientation;
if (UIDeviceOrientationLandscapeLeft == orientation) {
    //Rotate 90
    reader.cameraViewTransform = CGAffineTransformMakeRotation (3*M_PI/2.0);
} else if (UIDeviceOrientationLandscapeRight == orientation) {
    //Rotate 270
    reader.cameraViewTransform = CGAffineTransformMakeRotation (M_PI/2.0);
}

ZBarReaderView UIView相机方向问题

3 个答案: