Label Capture Advanced Overlay

Defined in framework ScanditLabelCapture

SDCLabelCaptureAdvancedOverlay
@interface SDCLabelCaptureAdvancedOverlay : UIView <SDCDataCaptureOverlay>

Added in version 6.16.0

An overlay for SDCDataCaptureView that allows anchoring a single user-provided View to each captured label.

The provided view is visible on top of the camera preview as long as its captured label is, and during time it retains its relative position to it. This is useful when additional information should be provided to the captured label in real time. For instance, a user may overlay the price of an item or its expiration date for each corresponding label.

To display the views, this overlay must be attached to a SDCDataCaptureView. This may be done either by creating it with overlayWithLabelCapture:forDataCaptureView: with a non-null view parameter or by passing this overlay to SDCDataCaptureView.addOverlay:.

A user of this class may configure what view is displayed for the given label and the relative position between the two by implementing SDCLabelCaptureAdvancedOverlayDelegate.

+ overlayWithLabelCapture:forDataCaptureView:
+ (instancetype)overlayWithLabelCapture:(nonnull SDCLabelCapture *)labelCapture
                     forDataCaptureView:(nullable SDCDataCaptureView *)view

Added in version 6.16.0

Constructs a new overlay to visualize the process of label capture. When view is non-nil, the overlay is automatically added to the view. Otherwise, the overlay needs to be added through a call to SDCDataCaptureView.addOverlay:.

+ labelCaptureAdvancedOverlayFromJSONString:mode:error:
+ (nullable instancetype)
  labelCaptureAdvancedOverlayFromJSONString:(nonnull NSString *)JSONString
                                       mode:(nonnull SDCLabelCapture *)mode
                                      error:(NSError **)error

Added in version 6.16.0

Constructs a new label capture advanced overlay with the provided JSON serialization.

For the overlay to be displayed on screen, it must be added to a SDCDataCaptureView.

delegate
@property (nonatomic, weak, nullable) id<SDCLabelCaptureAdvancedOverlayDelegate> delegate

Added in version 6.16.0

The delegate which is called whenever a view, an anchor point and an offset must be defined for a tracked SDCCapturedLabel.

shouldShowScanAreaGuides
@property (nonatomic, assign) BOOL shouldShowScanAreaGuides

Added in version 6.16.0

Whether to show scan area guides on top of the preview. This property is useful during development to visualize the current scan areas on screen. It is not meant to be used for production. By default this property is NO.

- setView:forCapturedLabel:
- (void)setView:(nullable UIView *)view
forCapturedLabel:(nonnull SDCCapturedLabel *)capturedLabel

Added in version 6.16.0

The method can be called to change the view drawn for the given tracked label. Setting the view to nil will unset the view from the tracked label and will effectively remove it from the overlay. This method is thread-safe, it can be called from any thread. The view set via this method will take precedence over the one set via SDCLabelCaptureAdvancedOverlayDelegate.labelCaptureAdvancedOverlay:viewForCapturedLabel:: in case a view is set before SDCLabelCaptureAdvancedOverlayDelegate.labelCaptureAdvancedOverlay:viewForCapturedLabel: got called, no call to SDCLabelCaptureAdvancedOverlayDelegate.labelCaptureAdvancedOverlay:viewForCapturedLabel: will happen.

Note

The method no longer supports rendering any kind of images. For further details about this backwards incompatible change, contact support@scandit.com.

- setAnchor:forCapturedLabel:
- (void)setAnchor:(SDCAnchor)anchor
 forCapturedLabel:(nonnull SDCCapturedLabel *)capturedLabel

Added in version 6.16.0

The method can be called to change the anchor point for the view associated with the given tracked label. This method is thread-safe, it can be called from any thread. The anchor set via this method will take precedence over the one set via SDCLabelCaptureAdvancedOverlayDelegate.labelCaptureAdvancedOverlay:anchorForCapturedLabel:: in case a view is set before SDCLabelCaptureAdvancedOverlayDelegate.labelCaptureAdvancedOverlay:anchorForCapturedLabel: got called, no call to SDCLabelCaptureAdvancedOverlayDelegate.labelCaptureAdvancedOverlay:anchorForCapturedLabel: will happen.

- setOffset:forCapturedLabel:
- (void)setOffset:(SDCPointWithUnit)offset
 forCapturedLabel:(nonnull SDCCapturedLabel *)capturedLabel

Added in version 6.16.0

The method can be called to change the offset for the view associated with the given tracked label. This method is thread-safe, it can be called from any thread. The offset set via this method will take precedence over the one set via SDCLabelCaptureAdvancedOverlayDelegate.labelCaptureAdvancedOverlay:offsetForCapturedLabel:: in case a view is set before SDCLabelCaptureAdvancedOverlayDelegate.labelCaptureAdvancedOverlay:offsetForCapturedLabel: got called, no call to SDCLabelCaptureAdvancedOverlayDelegate.labelCaptureAdvancedOverlay:offsetForCapturedLabel: will happen. If the SDCMeasureUnit of the offset is SDCMeasureUnitFraction, the offset is calculated relative to view’s dimensions.

- setView:forField:ofCapturedLabel:
- (void)setView:(nullable UIView *)view
       forField:(nonnull SDCLabelField *)field
ofCapturedLabel:(nonnull SDCCapturedLabel *)capturedLabel

Added in version 6.17.0

The method can be called to change the view drawn for the given tracked field of the captured label. Setting the view to nil will unset the view from the tracked field of the captured label and will effectively remove it from the overlay. This method is thread-safe, it can be called from any thread. The view set via this method will take precedence over the one set via SDCLabelCaptureAdvancedOverlayDelegate.labelCaptureAdvancedOverlay:viewForField:ofCapturedLabel:: in case a view is set before SDCLabelCaptureAdvancedOverlayDelegate.labelCaptureAdvancedOverlay:viewForField:ofCapturedLabel: got called, no call to SDCLabelCaptureAdvancedOverlayDelegate.labelCaptureAdvancedOverlay:viewForField:ofCapturedLabel: will happen.

Note

Requires a special license key to support rendering any kind of images since this feature is available only in limited countries. Please contact support@scandit.com for details

- setAnchor:forField:ofCapturedLabel:
- (void)setAnchor:(SDCAnchor)anchor
         forField:(nonnull SDCLabelField *)field
  ofCapturedLabel:(nonnull SDCCapturedLabel *)capturedLabel

Added in version 6.17.0

The method can be called to change the anchor point for the view associated with the given tracked field of the captured label. This method is thread-safe, it can be called from any thread. The anchor set via this method will take precedence over the one set via SDCLabelCaptureAdvancedOverlayDelegate.labelCaptureAdvancedOverlay:anchorForField:ofCapturedLabel:: in case a view is set before SDCLabelCaptureAdvancedOverlayDelegate.labelCaptureAdvancedOverlay:anchorForField:ofCapturedLabel: got called, no call to SDCLabelCaptureAdvancedOverlayDelegate.labelCaptureAdvancedOverlay:anchorForField:ofCapturedLabel: will happen.

- setOffset:forField:ofCapturedLabel:
- (void)setOffset:(SDCPointWithUnit)offset
         forField:(nonnull SDCLabelField *)field
  ofCapturedLabel:(nonnull SDCCapturedLabel *)capturedLabel

Added in version 6.17.0

The method can be called to change the offset for the view associated with the given tracked field of the captured label. This method is thread-safe, it can be called from any thread. The offset set via this method will take precedence over the one set via SDCLabelCaptureAdvancedOverlayDelegate.labelCaptureAdvancedOverlay:offsetForField:ofCapturedLabel:: in case a view is set before SDCLabelCaptureAdvancedOverlayDelegate.labelCaptureAdvancedOverlay:offsetForField:ofCapturedLabel: got called, no call to SDCLabelCaptureAdvancedOverlayDelegate.labelCaptureAdvancedOverlay:offsetForField:ofCapturedLabel: will happen. If the SDCMeasureUnit of the offset is SDCMeasureUnitFraction, the offset is calculated relative to view’s dimensions.

- clearTrackedCapturedLabelViews
- (void)clearTrackedCapturedLabelViews

Added in version 6.16.0

Clears all the views for the currently tracked labels from this overlay. This method is thread-safe, it can be called from any thread.

- updateFromJSONString:error:
- (BOOL)updateFromJSONString:(nonnull NSString *)JSONString
                       error:(NSError **)error

Added in version 6.16.0

Updates the overlay according to a JSON serialization.