VNRequest The abstract superclass for analysis requests. Declarationclass VNRequest OverviewOther Vision request handlers that perform image analysis inherit from this abstract base class. Instantiate one of its subclasses to perform image analysis. TopicsInitializing a Requestinit()init(completionHandler:)Configuring a RequestVNRequestCompletionHandlercompletionHandlerpreferBackgroundProcessingresultsrevisionusesCPUOnlyConfiguring the Compute DevicesetComputeDevice(_:for:)computeDevice(for:)supportedComputeStageDevicesCanceling a Requestcancel()Executing a Completion HandlerVNRequestCompletionHandlerDetermining the RevisionVNRequestRevisionProvidingcurrentRevisiondefaultRevisionsupportedRevisions RelationshipsInherits FromNSObjectInherited ByVNImageBasedRequestConforms ToCVarArgCustomDebugStringConvertibleCustomStringConvertibleEquatableHashableNSCopyingNSObjectProtocol See AlsoStill-image analysisDetecting Objects in Still ImagesClassifying images for categorization and searchAnalyzing Image Similarity with Feature PrintVNImageBasedRequestVNClassifyImageRequestVNGenerateImageFeaturePrintRequestVNFeaturePrintObservationVNImageRequestHandlerVNObservation