SBSDKBaseScannerViewFinderConfiguration

@interface SBSDKBaseScannerViewFinderConfiguration : NSObject

The view finder configuration object for a ‘SBSDKBaseScannerViewController’ and its subclasses. Sometimes it is necessary to limit a live video frame detection or recognition to a certain rectangular area with a specific aspect ratio: the region or rectangle of interest. This is where a view finder comes in. It crops the video frame to that region of interest before passing it to any detector or recognizer. Usually the performance of detectors/recognizers gain a benefit from it because less pixels must be processed. Additionally, to guide the user, the view finder visualizes the region of interest by drawing a rectangle around on the user interface.

Since the display resp. the camera view size differs from device to device specifying the region of interest in absolute screen points would require some additional calculations and therefore be inconvenient. Instead a combination of aspect ratio and minimum distances to the view(screen) edges is used.

  • Set to YES to enable and display the region of interest, to NO otherwise. Defaults to NO.

    Declaration

    Objective-C

    @property (nonatomic, assign, unsafe_unretained, readwrite,
          getter=isViewFinderEnabled) BOOL viewFinderEnabled;

    Swift

    var isViewFinderEnabled: Bool { get set }

  • The aspect ratio of the region of interest. Defaults to 4:3.

    Declaration

    Objective-C

    @property (nonatomic, strong, nonnull) SBSDKAspectRatio *aspectRatio;

    Swift

    var aspectRatio: SBSDKAspectRatio { get set }

  • The minimum space from view finders outer edges to the view/screen edges. The default value is {20, 20, 20, 20}.

    Declaration

    Objective-C

    @property (nonatomic) UIEdgeInsets minimumInset;

    Swift

    var minimumInset: UIEdgeInsets { get set }

  • If positive, the receiver will try to maintain the preferred height and the aspect ratio for the finder by dynamically changing the inset. If negative this property will be ignored. The default value is -1;

    Declaration

    Objective-C

    @property (nonatomic) CGFloat preferredHeight;

    Swift

    var preferredHeight: CGFloat { get set }

  • The aspect ratio of the secondary view finder that is displayed with dashed lines. If set to nil no secondary view finder is drawn. Defaults to nil.

    Declaration

    Objective-C

    @property (nonatomic, strong, nullable) SBSDKAspectRatio *secondaryAspectRatio;

    Swift

    var secondaryAspectRatio: SBSDKAspectRatio? { get set }

  • The minimum space from the primary view finder to the secondary view finder for each edge. Defaults to 10 for the top, left, bottom and right edge.

    Declaration

    Objective-C

    @property (nonatomic) UIEdgeInsets secondaryMinimumInset;

    Swift

    var secondaryMinimumInset: UIEdgeInsets { get set }

  • The line color of the view finders outline. Can be nil to not display the outline. Defaults to a fully opaque white color.

    Declaration

    Objective-C

    @property (nonatomic, strong, nullable) UIColor *lineColor;

    Swift

    var lineColor: UIColor? { get set }

  • The color of the background outside the view finders outline. Use this color to mask the region that is not of interest. Defaults to a black color with an opacity of 0.66, slightly darkening the non-interest area of the screen.

    Declaration

    Objective-C

    @property (nonatomic, strong, nullable) UIColor *backgroundColor;

    Swift

    var backgroundColor: UIColor? { get set }

  • The corner radius of the view finders outline. Defaults to 8 points.

    Declaration

    Objective-C

    @property (nonatomic) CGFloat lineCornerRadius;

    Swift

    var lineCornerRadius: CGFloat { get set }

  • The line width of the view finders outline. Defaults to 2 points.

    Declaration

    Objective-C

    @property (nonatomic) CGFloat lineWidth;

    Swift

    var lineWidth: CGFloat { get set }

  • Set to YES to animate the view finder when changing the aspect ratio or minimum insets, to NO if changes should not be animated.

    Declaration

    Objective-C

    @property (nonatomic, assign, unsafe_unretained, readwrite,
          getter=isAnimatingChanges) BOOL animateChanges;

    Swift

    var isAnimatingChanges: Bool { get set }

  • The visual effect applied to the area outside the view finder. If nil, no effect is applied. Defaults to nil.

    Declaration

    Objective-C

    @property (nonatomic, strong, nullable) UIVisualEffect *backgroundEffect;

    Swift

    var backgroundEffect: UIVisualEffect? { get set }

  • This is the default configuration with the properties initialized as mentioned in their description.

    Declaration

    Objective-C

    + (nonnull instancetype)defaultConfiguration;

    Swift

    class func `default`() -> Self

    Return Value

    The default view finder configuration object which can be changed and then passed back to the base scanner view controller.