Created
January 10, 2018 18:08
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@protocol CALayerDelegate <NSObject> | |
@optional | |
/* 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). */ | |
- (void)displayLayer:(CALayer *)layer; | |
/* If defined, called by the default implementation of -drawInContext: */ | |
- (void)drawLayer:(CALayer *)layer inContext:(CGContextRef)ctx; | |
/* 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. */ | |
- (void)layerWillDraw:(CALayer *)layer | |
CA_AVAILABLE_STARTING (10.12, 10.0, 10.0, 3.0); | |
/* 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. */ | |
- (void)layoutSublayersOfLayer:(CALayer *)layer; | |
/* If defined, called by the default implementation of the | |
* -actionForKey: method. Should return an object implementating 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.) */ | |
- (nullable id<CAAction>)actionForLayer:(CALayer *)layer forKey:(NSString *)event; | |
@end |
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