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 ZXing.Net.Mobile.iOS.ZXingScannerViewController(options, this);
viewController.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 ZXing.Net.Mobile.iOS.ZXingScannerViewController(options, this);
}
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;
}
}));
}