The delegate of an AVCaptureMetadataOutput object must adopt the AVCaptureMetadataOutputObjectsDelegate protocol. The single method in this protocol is optional. It allows a delegate to respond when a capture metadata output object receives relevant metadata objects through its connection. Tells the delegate that the capture metadata output object emitted new metadata objects.
Instance Method Summary (collapse)
Tells the delegate that the capture metadata output object emitted new metadata objects.
Instance Method Details
- () captureOutput(captureOutput, didOutputMetadataObjects:metadataObjects, fromConnection:connection)
Tells the delegate that the capture metadata output object emitted new metadata objects. The AVCaptureMetadataOutput object emits only metadata objects whose types are included in its metadataObjectTypes property. Your delegate can implement this method and use it to perform additional processing on those metadata objects as they become available. If you plan to use metadata objects outside of the scope of this method, you must store strong references to them and remove those references when you no longer need the objects.This method is executed on the dispatch queue specified by the metadataObjectsCallbackQueue property of the capture metadata output object. Because this method may be called frequently, your implementation should be efficient to prevent capture performance problems, including dropped metadata objects.