系统语音识别API，支持iOS10级以上的版本，需要麦克风权限和语音识别权限。

一、系统类

1. 导入系统库

import Speech

2. SFSpeechRecognizer声音处理器

SFSpeechRecognizer(locale: Locale(identifier: "zh-CN"))

根据传入的语言简称来返回一个声音处理器

3. SFSpeechAudioBufferRecognitionRequest 语音识别器

  lazy var recognitionRequest: SFSpeechAudioBufferRecognitionRequest = {let recognitionRequest = SFSpeechAudioBufferRecognitionRequest()// 结果报告recognitionRequest.shouldReportPartialResults = truereturn recognitionRequest}()

4. AVAudioEngine 处理声音的数据

    private let audioEngine = AVAudioEngine()

5. SFSpeechRecognitionTask 语言识别任务管理器

启用和关闭任务

speechTask = speechRecognizer.recognitionTask(with: recognitionRequest) { (speechResult, error) in
}
speechTask?.cancel()

二、代码整理

1. 初始化属性

// 声音处理器private var speechRecognizer: SFSpeechRecognizer?// 语言识别任务管理器private var speechTask: SFSpeechRecognitionTask?// 语音识别器lazy var recognitionRequest: SFSpeechAudioBufferRecognitionRequest = {let recognitionRequest = SFSpeechAudioBufferRecognitionRequest()// 结果报告recognitionRequest.shouldReportPartialResults = truereturn recognitionRequest}()// 处理声音数据private let audioEngine = AVAudioEngine()

2. 判断权限

// 判断语音识别权限private func checkRecognizerAuthorization(_ recongStatus: @escaping (_ resType: Bool) -> Void) {let authorStatus = SFSpeechRecognizer.authorizationStatus()if authorStatus == .authorized {recongStatus(true)} else if authorStatus == .notDetermined {SFSpeechRecognizer.requestAuthorization { (status) inif status == .authorized {recongStatus(true)} else {recongStatus(false )}}} else {recongStatus(false)}}// 检测麦克风private func checkmicroPhoneAuthorization(_ authoStatus: @escaping (_ resultStatus: Bool) -> Void) {let microPhoneStatus = AVCaptureDevice.authorizationStatus(for: .audio)if microPhoneStatus == .authorized {authoStatus(true)} else if microPhoneStatus == .notDetermined {AVCaptureDevice.requestAccess(for: .audio, completionHandler: {(res) inif res {authoStatus(true)} else {authoStatus(false)}})} else {authoStatus(false)}}

3. 开始语音识别

// 开始进行private func startDictating() {self.speechRecognizer = SFSpeechRecognizer(locale: Locale(identifier: "zh-CN"))guard let speechRecognizer = self.speechRecognizer else {GXAlertManager.showDefaultAlert(title: "温馨提示", msg: "抱歉，暂不支持当前地区使用语音输入")return}let audioSession = AVAudioSession.sharedInstance()do {try audioSession.setCategory(.record)try audioSession.setMode(.measurement)try audioSession.setActive(true, options: .notifyOthersOnDeactivation)} catch {fatalError("会话建立失败")}setStatusCallBack(type: .start, text: nil)do {try audioEngine.start()// 开启授权任务speechTask = speechRecognizer.recognitionTask(with: recognitionRequest) { (speechResult, error) in// 识别结果，识别后的操作guard let speechResult = speechResult, error == nil else {return}self.setStatusCallBack(type: .finished, text: speechResult.bestTranscription.formattedString)}} catch {print(error)self.setStatusCallBack(type: .finished, text: nil)}}

4. 停止语音识别

// 停止声音处理器，停止语音识别请求进程func stopDictating() {setStatusCallBack(type: .stop, text: nil)recognitionRequest.endAudio()audioEngine.stop()speechTask?.cancel()}

5. 调用方法

func startSpeech() {checkmicroPhoneAuthorization { (microStatus) inguard microStatus == true else {// 麦克风没有授权GXAlertManager.showDefaultAlert(title: "温馨提示", msg: "您已取消授权使用麦克风，如果需要使用语音识别功能，可以到设置中重新开启！")self.setStatusCallBack(type: .authDenied, text: nil)return}self.checkRecognizerAuthorization { recStatus inguard recStatus == true else {GXAlertManager.showDefaultAlert(title: "温馨提示", msg: "您已取消授权使用语音识别，如果需要使用语音识别功能，可以到设置中重新开启！")self.setStatusCallBack(type: .authDenied, text: nil)return}// 初始化语音处理器的输入模式 语音处理器准备就绪（会为一些audioEngine启动时所必须的资源开辟内存）let inputNode = self.audioEngine.inputNodeself.audioEngine.prepare()if self.speechTask?.state == .running {   // 如果当前进程状态是进行中// 停止语音识别self.stopDictating()} else {   // 进程状态不在进行中// 开启语音识别self.startDictating()}}}}