在SpeechKit框架中连续收听用户语音并检测语音结束语

我有一个应用程序,我们需要打开基于语音命令的某些屏幕,如果用户说"打开设置"然后它应该打开设置屏幕,到目前为止,我已经使用了SpeechKit框架,但我无法检测到的结束言语沉默.就像Siri一样.我想检测用户是否已结束他的句子/短语.

请在下面的代码中找到我SpeechKit用两种方式集成框架的代码.

A)通过闭包(recognitionTask(with request: SFSpeechRecognitionRequest, resultHandler: @escaping (SFSpeechRecognitionResult?, Error?) -> Swift.Void) -> SFSpeechRecognitionTask)

let audioEngine = AVAudioEngine()
let speechRecognizer = SFSpeechRecognizer()
let request = SFSpeechAudioBufferRecognitionRequest()
var recognitionTask: SFSpeechRecognitionTask?

func startRecording() throws {

        let node = audioEngine.inputNode
        let recordingFormat = node.outputFormat(forBus: 0)

        node.installTap(onBus: 0, bufferSize: 1024,
                        format: recordingFormat) { [unowned self]
                            (buffer, _) in
                            self.request.append(buffer)
        }

        audioEngine.prepare()
        try audioEngine.start()

        weak var weakSelf = self

        recognitiOnTask= speechRecognizer?.recognitionTask(with: request) {
            (result, error) in

            if result != nil {

                if let transcription = result?.bestTranscription {
                    weakSelf?.idenifyVoiceCommand(transcription)
                }
            }
        }            
}

但是当我说任何单词/句子如"打开设置"然后recognitionTask(with:)多次调用closure()并且我将方法(idenifyVoiceCommand)放在多次调用的闭包中时,我怎样才能限制只调用一次.

我还在谷歌上搜索定时器逻辑(SFSpeechRecognizer - 检测话语的结束),但在我的观点中它不起作用,因为我没有停止音频引擎,因为它像Siri一样持续听用户的声音.

B)通过委托(SFSpeechRecognitionTaskDelegate)

speechRecognizer.recognitionTask(with:self.request,delegate:self)

func speechRecognitionTaskWasCancelled(_ task: SFSpeechRecognitionTask) {

}

func speechRecognitionTask(_ task: SFSpeechRecognitionTask, didFinishSuccessfully successfully: Bool) {

}

我发现在发言结束时处理的代表不会调用它,有时候不小心调用它.