Package apple.quartzcore.protocol

Interface CALayerDelegate

All Known Implementing Classes:

ARCoachingOverlayView, ARSCNView, ARSKView, ASAuthorizationAppleIDButton, AVRoutePickerView, BCChatButton, CAInterAppAudioSwitcherView, CAInterAppAudioTransportView, CLLocationButton, CPWindow, GLKView, HKActivityRingView, HMCameraView, INUIAddVoiceShortcutButton, LPLinkView, MKAnnotationView, MKCircleView, MKCompassButton, MKMapView, MKMarkerAnnotationView, MKOverlayPathView, MKOverlayView, MKPinAnnotationView, MKPolygonView, MKPolylineView, MKScaleView, MKUserLocationView, MKUserTrackingButton, MPVolumeView, MSStickerBrowserView, MSStickerView, MTKView, PDFThumbnailView, PDFView, PHLivePhotoView, PKAddPassButton, PKCanvasView, PKIdentityButton, PKPayLaterView, PKPaymentButton, RPSystemBroadcastPickerView, SCNView, SKView, SWAttributionView, SWCollaborationView, UIActionSheet, UIActivityIndicatorView, UIAlertView, UIButton, UICalendarView, UICollectionReusableView, UICollectionView, UICollectionViewCell, UICollectionViewListCell, UIColorWell, UIContentUnavailableView, UIControl, UIDatePicker, UIEventAttributionView, UIImageView, UIInputView, UILabel, UIListContentView, UINavigationBar, UIPageControl, UIPasteControl, UIPickerView, UIPopoverBackgroundView, UIProgressView, UIRefreshControl, UIScrollView, UISearchBar, UISearchTextField, UISegmentedControl, UISlider, UIStackView, UIStepper, UISwitch, UITabBar, UITableView, UITableViewCell, UITableViewHeaderFooterView, UITextField, UITextView, UIToolbar, UIView, UIVisualEffectView, UIWebView, UIWindow, WKWebView

public interface CALayerDelegate

Delegate methods. *

Method Summary

Modifier and Type	Method	Description
default @Nullable CAAction	actionForLayerForKey(@NotNull CALayer layer, @NotNull java.lang.String event)	If defined, called by the default implementation of the -actionForKey: method.
default void	displayLayer(@NotNull CALayer layer)	If defined, called by the default implementation of the -display method, in which case it should implement the entire display process (typically by setting the `contents' property).
default void	drawLayerInContext(@NotNull CALayer layer, @NotNull CGContextRef ctx)	If defined, called by the default implementation of -drawInContext:
default void	layerWillDraw(@NotNull CALayer layer)	If defined, called by the default implementation of the -display method.
default void	layoutSublayersOfLayer(@NotNull CALayer layer)	Called by the default -layoutSublayers implementation before the layout manager is checked.

Method Detail

actionForLayerForKey

@Nullable
default @Nullable CAAction actionForLayerForKey(@NotNull
                                                @NotNull CALayer layer,
                                                @NotNull
                                                @NotNull java.lang.String event)

If defined, called by the default implementation of the -actionForKey: method. Should return an object implementing the CAAction protocol. May return 'nil' if the delegate doesn't specify a behavior for the current event. Returning the null object (i.e. '[NSNull null]') explicitly forces no further search. (I.e. the +defaultActionForKey: method will not be called.)

displayLayer

default void displayLayer(@NotNull
                          @NotNull CALayer layer)

If defined, called by the default implementation of the -display method, in which case it should implement the entire display process (typically by setting the `contents' property).

drawLayerInContext

default void drawLayerInContext(@NotNull
                                @NotNull CALayer layer,
                                @NotNull
                                @NotNull CGContextRef ctx)

If defined, called by the default implementation of -drawInContext:

layerWillDraw

default void layerWillDraw(@NotNull
                           @NotNull CALayer layer)

If defined, called by the default implementation of the -display method. Allows the delegate to configure any layer state affecting contents prior to -drawLayer:InContext: such as `contentsFormat' and `opaque'. It will not be called if the delegate implements -displayLayer. API-Since: 10.0

layoutSublayersOfLayer

default void layoutSublayersOfLayer(@NotNull
                                    @NotNull CALayer layer)

Called by the default -layoutSublayers implementation before the layout manager is checked. Note that if the delegate method is invoked, the layout manager will be ignored.