A block executed at intervals during the processing of a Vision request.
- iOS 13.0+
- macOS 10.15+
- Mac Catalyst 13.0+
- tvOS 13.0+
The completed Vision request. The results of the request, if no error occurred, reside in the
resultsarray of the request.
The fraction of the request that is completed, reported between
1. If the
indeterminateproperty is set, this value is undefined.
The error that caused the request to fail, or
nilif the request completed successfully.
Vision may populate the
results array in the request with partial data, before all results are ready.