protected override void OnElementChanged(ElementChangedEventArgs <PickerView> e)
{
base.OnElementChanged(e);
if (e.NewElement != null)
{
pickerView = e.NewElement;
e.NewElement.StartScanningRequested += OnStartScanningRequested;
e.NewElement.PauseScanningRequested += OnPauseScanningRequested;
barcodePicker = new RotationSettingAwareBarcodePicker(CreateScanSettings());
SetNativeControl(barcodePicker.View);
scanDelegate = new PickerScanDelegate
{
PickerView = pickerView,
ContinuousAfterScan = pickerView.Settings.ContinuousAfterScan
};
barcodePicker.ScanDelegate = scanDelegate;
ApplyOverlaySettings();
barcodePicker.StartScanning();
}
if (e.OldElement != null)
{
e.OldElement.StartScanningRequested -= OnStartScanningRequested;
e.OldElement.PauseScanningRequested -= OnPauseScanningRequested;
}
}
partial void scanButtonClicked(Foundation.NSObject sender)
{
// The scanning behavior of the barcode picker is configured through scan
// settings. We start with empty scan settings and enable a very generous
// set of symbologies. In your own apps, only enable the symbologies you
// actually need.
ScanSettings settings = ScanSettings.DefaultSettings();
NSSet symbologiesToEnable = new NSSet(
Symbology.EAN13,
Symbology.EAN8,
Symbology.UPC12,
Symbology.UPCE,
Symbology.Datamatrix,
Symbology.QR,
Symbology.Code39,
Symbology.Code128,
Symbology.ITF
);
settings.EnableSymbologies(symbologiesToEnable);
// Some 1d barcode symbologies allow you to encode variable-length data. By default, the
// Scandit BarcodeScanner SDK only scans barcodes in a certain length range. If your
// application requires scanning of one of these symbologies, and the length is falling
// outside the default range, you may need to adjust the "active symbol counts" for this
// symbology. This is shown in the following 3 lines of code.
NSMutableSet codeLengths = new NSMutableSet();
int i = 0;
for (i = 7; i <= 20; i++)
{
codeLengths.Add(new NSNumber(i));
}
settings.SettingsForSymbology(Symbology.Code128).ActiveSymbolCounts = codeLengths;
// For details on defaults and how to calculate the symbol counts for each symbology, take
// a look at http://docs.scandit.com/stable/c_api/symbologies.html.
// Setup the barcode scanner
BarcodePicker picker = new BarcodePicker(settings);
picker.OverlayView.ShowToolBar(true);
// Add delegates for the scan and cancel event. We keep references to the
// delegates until the picker is no longer used as the delegates are softly
// referenced and can be removed because of low memory.
scanDelegate = new PickerScanDelegate();
picker.ScanDelegate = scanDelegate;
cancelDelegate = new OverlayCancelDelegate(this, picker);
picker.OverlayView.CancelDelegate = cancelDelegate;
PresentViewController(picker, true, null);
picker.StartScanning();
}
public override void ViewDidLoad()
{
base.ViewDidLoad();
// The scanning behavior of the barcode picker is configured through scan
// settings. We start with empty scan settings and enable a generous set
// of 1D symbologies. Matrix scan is currently only supported for 1D
// symbologies, enabling 2D symbologies will result in unexpected results.
// In your own apps, only enable the symbologies you actually need.
ScanSettings settings = ScanSettings.DefaultSettings();
NSSet symbologiesToEnable = new NSSet(
Symbology.EAN13,
Symbology.EAN8,
Symbology.UPC12,
Symbology.UPCE,
Symbology.Code39,
Symbology.Code128,
Symbology.ITF
);
// Enable matrix scan and set the max number of barcodes that can be recognized per frame
// to some reasonable number for your use case. The max number of codes per frame does not
// limit the number of codes that can be tracked at the same time, it only limits the
// number of codes that can be newly recognized per frame.
settings.EnableSymbologies(symbologiesToEnable);
settings.MatrixScanEnabled = true;
settings.MaxNumberOfCodesPerFrame = 10;
settings.HighDensityModeEnabled = true;
// When matrix scan is enabled beeping/vibrating is often not wanted.
BarcodePicker picker = new BarcodePicker(settings);
picker.OverlayView.SetBeepEnabled(false);
picker.OverlayView.SetVibrateEnabled(false);
// Register a SBSScanDelegate delegate, in order to be notified about relevant events
// (e.g. a successfully scanned bar code).
scanDelegate = new PickerScanDelegate();
picker.ScanDelegate = scanDelegate;
// Register a SBSProcessFrameDelegate delegate to be able to reject tracked codes.
processFrameDelegate = new PickerProcessFrameDelegate();
picker.ProcessFrameDelegate = processFrameDelegate;
AddChildViewController(picker);
picker.View.Frame = View.Bounds;
Add(picker.View);
picker.DidMoveToParentViewController(this);
picker.OverlayView.GuiStyle = GuiStyle.MatrixScan;
picker.StartScanning();
}
public override void ViewDidLoad()
{
base.ViewDidLoad();
// The scanning behavior of the barcode picker is configured through scan
// settings. We start with empty scan settings and enable a very generous
// set of symbologies. In your own apps, only enable the symbologies you
// actually need.
ScanSettings settings = ScanSettings.DefaultSettings();
NSSet symbologiesToEnable = new NSSet(
Symbology.EAN13,
Symbology.EAN8,
Symbology.UPC12,
Symbology.UPCE,
Symbology.Datamatrix,
Symbology.QR,
Symbology.Code39,
Symbology.Code128,
Symbology.ITF
);
settings.EnableSymbologies(symbologiesToEnable);
// Enable and set the restrict active area. This will make sure that codes are only scanned in a very thin band in the center of the image.
settings.SetActiveScanningArea(new CoreGraphics.CGRect(0, 0.48, 1, 0.04));
// Setup the barcode scanner
picker = new BarcodePicker(settings);
picker.OverlayView.ShowToolBar(false);
// Add delegate for the scan event. We keep references to the
// delegates until the picker is no longer used as the delegates are softly
// referenced and can be removed because of low memory.
scanDelegate = new PickerScanDelegate();
picker.ScanDelegate = scanDelegate;
AddChildViewController(picker);
picker.View.Frame = View.Bounds;
Add(picker.View);
picker.DidMoveToParentViewController(this);
// Modify the GUI style to have a "laser" line instead of a square viewfinder.
picker.OverlayView.GuiStyle = GuiStyle.Laser;
// Start scanning in paused state.
picker.StartScanning(true);
showAimAndScanButton();
}
