Xamarin Forms-Zxing QR Scanner-如何切换使用的相机? [英] Xamarin Forms - Zxing QR Scanner - How can you toggle the camera being used?

问题描述

当我开始使用Xamarian形式的ScannerView扫描条形码时，它会自动转到手机上的后置摄像头.

When I start scanning for barcodes using a ScannerView in Xamarian forms, it automatically goes to the back camera on the phone.

我想创建一个切换相机按钮，将相机从后向前切换，反之亦然.

I would like to make a toggle camera button that toggles the camera from back to front and vice versa.

使用xxing形式的xamarin可以做到吗?

Is this possible using zxing for xamarin forms?

我的选项如下:

代码:

//Set the scanner options.
ScannerView.Options = new ZXing.Mobile.MobileBarcodeScanningOptions()
{
    UseNativeScanning = true,
    AutoRotate = true,
    PossibleFormats = new List<ZXing.BarcodeFormat>()
    {
        ZXing.BarcodeFormat.QR_CODE
    },
    TryHarder = true,
    UseFrontCameraIfAvailable = false,
    DelayBetweenContinuousScans = 2000
};

一旦我开始通过设置进行扫描

Once I start scanning by setting

ScannerView.IsScanning = true;

设置:

ScannerView.Options.UseFrontCameraIfAvailable = true;

请勿更换相机.但是我可以这样做

Does NOT change the camera. I can however do this

ScannerView = null;
CreateScannerView();
ScannerView.Options.UseFrontCameraIfAvailable = true;
ScannerView.IsScanning = true;

它有效.但是，摄像机视图会完全消失约2秒钟，然后再返回.当我为另一个应用程序的iOS进行本机的Xcode拍摄时，相机视图永不消失，只是翻转了相机.我期待这样的事情.

And it works. However the camera view completely disappears for about 2 seconds and then comes back. When I did it native Xcode for iOS for another app, the camera view never went away and just flipped cameras. I'm expecting something like that.

可以切换相机吗?

推荐答案

我不认为Zxing开始扫描后就可以在Zxing相机之间进行切换，因此必须事先选择并设置选项.

I don't think switching between cameras itself is possible with Zxing once it has started scanning so the option has to be chosen and set beforehand.

 var options = new MobileBarcodeScanningOptions
 {
     AutoRotate = true,
     UseNativeScanning = true,
     TryHarder = true,
     TryInverted = true,
     UseFrontCameraIfAvailable  = true
 };

 var scannedCode = await _scanner.Scan(options);

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