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, PKPaymentButton, RPSystemBroadcastPickerView, SCNView, SKView, UIActionSheet, UIActivityIndicatorView, UIAlertView, UIButton, UICollectionReusableView, UICollectionView, UICollectionViewCell, UICollectionViewListCell, UIColorWell, UIControl, UIDatePicker, UIEventAttributionView, UIImageView, UIInputView, UILabel, UIListContentView, UINavigationBar, UIPageControl, 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 and Description
default CAAction	actionForLayerForKey(CALayer layer, java.lang.String event) If defined, called by the default implementation of the -actionForKey: method.
default void	displayLayer(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(CALayer layer, CGContextRef ctx) If defined, called by the default implementation of -drawInContext:
default void	layerWillDraw(CALayer layer) If defined, called by the default implementation of the -display method.
default void	layoutSublayersOfLayer(CALayer layer) Called by the default -layoutSublayers implementation before the layout manager is checked.

Method Detail

actionForLayerForKey

default CAAction actionForLayerForKey(CALayer layer,
                                      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(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(CALayer layer,
                                CGContextRef ctx)

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

layerWillDraw

default void layerWillDraw(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.

layoutSublayersOfLayer

default void layoutSublayersOfLayer(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.