method · iOS 17.0+nextTypeScriptnext(): Promise<(PhotogrammetrySession_Output) | null>Swift declarationmutating func next() async throws -> PhotogrammetrySession.Outputs.Element?Asynchronously advances to the next element and returns it, or ends the sequence if there is no next element. - Returns: The next element, if it exists, or `nil` to signal the end of the sequence.