public void ScanContinuously(MobileBarcodeScanningOptions options, bool useAVCaptureEngine, Action <Result> scanHandler)
{
try
{
Version sv = new Version(0, 0, 0);
Version.TryParse(UIDevice.CurrentDevice.SystemVersion, out sv);
var is7orgreater = sv.Major >= 7;
var allRequestedFormatsSupported = true;
if (useAVCaptureEngine)
{
allRequestedFormatsSupported = AVCaptureScannerView.SupportsAllRequestedBarcodeFormats(options.PossibleFormats);
}
this.appController.InvokeOnMainThread(() =>
{
//if (useAVCaptureEngine && is7orgreater && allRequestedFormatsSupported)
//{
// viewController = new AVCaptureScannerViewController(options, this);
// viewController.ContinuousScanning = true;
//}
//else
//{
//if (useAVCaptureEngine && !is7orgreater)
// Console.WriteLine("Not iOS 7 or greater, cannot use AVCapture for barcode decoding, using ZXing instead");
//else if (useAVCaptureEngine && !allRequestedFormatsSupported)
//Console.WriteLine("Not all requested barcode formats were supported by AVCapture, using ZXing instead");
viewController = new CustomScannerViewController(options, new MobileBarcodeScanner())
{
ContinuousScanning = true
};
//}
viewController.OnScannedResult += barcodeResult =>
{
// If null, stop scanning was called
if (barcodeResult == null)
{
((UIViewController)viewController).InvokeOnMainThread(() =>
{
((UIViewController)viewController).DismissViewController(true, null);
});
}
scanHandler(barcodeResult);
};
appController.PresentViewController((UIViewController)viewController, true, null);
});
}
catch (Exception ex)
{
Console.WriteLine(ex);
}
}
public Task <Result> Scan(MobileBarcodeScanningOptions options, bool useAVCaptureEngine)
{
return(Task.Factory.StartNew(() =>
{
try
{
scanResultResetEvent.Reset();
Result result = null;
Version sv = new Version(0, 0, 0);
Version.TryParse(UIDevice.CurrentDevice.SystemVersion, out sv);
var is7orgreater = sv.Major >= 7;
var allRequestedFormatsSupported = true;
if (useAVCaptureEngine)
{
allRequestedFormatsSupported = AVCaptureScannerView.SupportsAllRequestedBarcodeFormats(options.PossibleFormats);
}
this.appController.InvokeOnMainThread(() =>
{
//if (useAVCaptureEngine && is7orgreater && allRequestedFormatsSupported)
//{
// viewController = new AVCaptureScannerViewController(options, this);
//}
//else
//{
//if (useAVCaptureEngine && !is7orgreater)
// Console.WriteLine("Not iOS 7 or greater, cannot use AVCapture for barcode decoding, using ZXing instead");
//else if (useAVCaptureEngine && !allRequestedFormatsSupported)
//Console.WriteLine("Not all requested barcode formats were supported by AVCapture, using ZXing instead");
viewController = new CustomScannerViewController(options, new MobileBarcodeScanner());
//}
viewController.OnScannedResult += barcodeResult =>
{
((UIViewController)viewController).InvokeOnMainThread(() =>
{
viewController.Cancel();
// Handle error situation that occurs when user manually closes scanner in the same moment that a QR code is detected
try
{
((UIViewController)viewController).DismissViewController(true, () =>
{
result = barcodeResult;
scanResultResetEvent.Set();
});
}
catch (ObjectDisposedException)
{
// In all likelihood, iOS has decided to close the scanner at this point. But just in case it executes the
// post-scan code instead, set the result so we will not get a NullReferenceException.
result = barcodeResult;
scanResultResetEvent.Set();
}
});
};
appController.PresentViewController((UIViewController)viewController, true, null);
});
scanResultResetEvent.WaitOne();
((UIViewController)viewController).Dispose();
return result;
}
catch (Exception ex)
{
Console.WriteLine(ex);
return null;
}
}));
}
protected override void OnElementChanged(ElementChangedEventArgs <ZXingScannerView> e)
{
AutoresizingMask = UIViewAutoresizing.FlexibleWidth | UIViewAutoresizing.FlexibleHeight;
formsView = Element;
if (zxingView == null)
{
// Process requests for autofocus
formsView.AutoFocusRequested += (x, y) => {
if (zxingView != null)
{
if (x < 0 && y < 0)
{
zxingView.AutoFocus();
}
else
{
zxingView.AutoFocus(x, y);
}
}
};
if (formsView.Options.UseNativeScanning)
{
Version sv = new Version(0, 0, 0);
Version.TryParse(UIDevice.CurrentDevice.SystemVersion, out sv);
var is7orgreater = sv.Major >= 7;
var allRequestedFormatsSupported = true;
allRequestedFormatsSupported = AVCaptureScannerView.SupportsAllRequestedBarcodeFormats(formsView.Options.PossibleFormats);
if (is7orgreater && allRequestedFormatsSupported)
{
Console.WriteLine("Using AVCapture for barcode decoding");
zxingView = new AVCaptureScannerView();
}
else
{
if (!is7orgreater)
{
Console.WriteLine("Not iOS 7 or greater, cannot use AVCapture for barcode decoding, using ZXing instead");
}
else
{
Console.WriteLine("Not all requested barcode formats were supported by AVCapture, using ZXing instead");
}
zxingView = new ZXing.Mobile.ZXingScannerView();
}
}
else
{
Console.WriteLine("Using ZXing for barcode decoding");
zxingView = new ZXing.Mobile.ZXingScannerView();
}
zxingView.UseCustomOverlayView = true;
zxingView.CustomOverlayView = new UIView();
zxingView.AutoresizingMask = UIViewAutoresizing.FlexibleWidth | UIViewAutoresizing.FlexibleHeight;
base.SetNativeControl(zxingView);
if (formsView.IsScanning)
{
zxingView.StartScanning(formsView.RaiseScanResult, formsView.Options);
}
if (!formsView.IsAnalyzing)
{
zxingView.PauseAnalysis();
}
if (formsView.IsTorchOn)
{
zxingView.Torch(formsView.IsTorchOn);
}
}
base.OnElementChanged(e);
}