SCCameraKitLensPrefetcher

Objective-C

@protocol SCCameraKitLensPrefetcher <NSObject>

Swift

protocol LensPrefetcher : NSObjectProtocol

Describes the interface used to prefetch lens content


                    
                    
                    -prefetchLenses:completion:

Queues up a new fetch task for each of the lenses in order to prefetch their content. A successful callback indiciates that all the content for the list of lenses is ready to be used/applied in lens processor

Declaration

Objective-C

- (nonnull id<SCCameraKitLensPrefetcherTask>)
    prefetchLenses:(nonnull NSArray<id<SCCameraKitLens>> *)lenses
        completion:(nullable void (^)(BOOL))completion;

Parameters

`lenses`	lenses to prefetch content for
`completion`	callback on completion with success or failure


                    
                    
                    -addStatusObserver:forLens:

Add observer to observe changes in lens fetch status

Declaration

Objective-C

- (void)addStatusObserver:
            (nonnull id<SCCameraKitLensPrefetcherObserver>)observer
                  forLens:(nonnull id<SCCameraKitLens>)lens;

Parameters

`observer`	observer instance which will receive updates
`lens`	lens to observe


                    
                    
                    -removeStatusObserver:forLens:

Remove observer to stop observing changes in lens fetch status

Declaration

Objective-C

- (void)removeStatusObserver:
            (nonnull id<SCCameraKitLensPrefetcherObserver>)observer
                     forLens:(nonnull id<SCCameraKitLens>)lens;

Parameters

`observer`	observer instance which will stop receiving updates
`lens`	lens to stop observing