基本上我正在学习ios语音识别模块，遵循本教程：https://medium.com/ios-os-x-development/speech-recognition-with-swift-in-ios-10-50d5f4e59c48
但是当我在iphone6上测试时，我总是遇到这个错误：Error Domain = kAFAssistantErrorDomain Code = 216“（null）”
我在互联网上搜索过它，但是找到了非常罕见的信息。
这是我的代码：
//
// ViewController.swift
// speech_sample
//
// Created by Peizheng Ma on 6/22/17.
// Copyright © 2017 Peizheng Ma. All rights reserved.
//
import UIKit
import AVFoundation
import Speech
class ViewController: UIViewController, SFSpeechRecognizerDelegate {
//MARK: speech recognize variables
let audioEngine = AVAudioEngine()
let speechRecognizer: SFSpeechRecognizer? = SFSpeechRecognizer(locale: Locale.init(identifier: "en-US"))
var request = SFSpeechAudioBufferRecognitionRequest()
var recognitionTask: SFSpeechRecognitionTask?
var isRecording = false
override func viewDidLoad() {
// super.viewDidLoad()
// get Authorization
self.requestSpeechAuthorization()
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
//MARK: properties
@IBOutlet weak var detectText: UILabel!
@IBOutlet weak var startButton: UIButton!
//MARK: actions
@IBAction func startButtonTapped(_ sender: UIButton) {
if isRecording == true {
audioEngine.stop()
// if let node = audioEngine.inputNode {
// node.removeTap(onBus: 0)
// }
audioEngine.inputNode?.removeTap(onBus: 0)
// Indicate that the audio source is finished and no more audio will be appended
self.request.endAudio()
// Cancel the previous task if it's running
if let recognitionTask = recognitionTask {
recognitionTask.cancel()
self.recognitionTask = nil
}
//recognitionTask?.cancel()
//self.recognitionTask = nil
isRecording = false
startButton.backgroundColor = UIColor.gray
} else {
self.recordAndRecognizeSpeech()
isRecording = true
startButton.backgroundColor = UIColor.red
}
}
//MARK: show alert
func showAlert(title: String, message: String, handler: ((UIAlertAction) -> Swift.Void)? = nil) {
DispatchQueue.main.async { [unowned self] in
let alertController = UIAlertController(title: title, message: message, preferredStyle: .alert)
alertController.addAction(UIAlertAction(title: "OK", style: .cancel, handler: handler))
self.present(alertController, animated: true, completion: nil)
}
}
//MARK: Recognize Speech
func recordAndRecognizeSpeech() {
// Setup Audio Session
guard let node = audioEngine.inputNode else { return }
let recordingFormat = node.outputFormat(forBus: 0)
node.installTap(onBus: 0, bufferSize: 1024, format: recordingFormat) { buffer, _ in
self.request.append(buffer)
}
audioEngine.prepare()
do {
try audioEngine.start()
} catch {
self.showAlert(title: "SpeechNote", message: "There has been an audio engine error.", handler: nil)
return print(error)
}
guard let myRecognizer = SFSpeechRecognizer() else {
self.showAlert(title: "SpeechNote", message: "Speech recognition is not supported for your current locale.", handler: nil)
return
}
if !myRecognizer.isAvailable {
self.showAlert(title: "SpeechNote", message: "Speech recognition is not currently available. Check back at a later time.", handler: nil)
// Recognizer is not available right now
return
}
recognitionTask = speechRecognizer?.recognitionTask(with: request, resultHandler: { result, error in
if let result = result {
let bestString = result.bestTranscription.formattedString
self.detectText.text = bestString
// var lastString: String = ""
// for segment in result.bestTranscription.segments {
// let indexTo = bestString.index(bestString.startIndex, offsetBy: segment.substringRange.location)
// lastString = bestString.substring(from: indexTo)
// }
// self.checkForColorsSaid(resultString: lastString)
} else if let error = error {
self.showAlert(title: "SpeechNote", message: "There has been a speech recognition error.", handler: nil)
print(error)
}
})
}
//MARK: - Check Authorization Status
func requestSpeechAuthorization() {
SFSpeechRecognizer.requestAuthorization { authStatus in
OperationQueue.main.addOperation {
switch authStatus {
case .authorized:
self.startButton.isEnabled = true
case .denied:
self.startButton.isEnabled = false
self.detectText.text = "User denied access to speech recognition"
case .restricted:
self.startButton.isEnabled = false
self.detectText.text = "Speech recognition restricted on this device"
case .notDetermined:
self.startButton.isEnabled = false
self.detectText.text = "Speech recognition not yet authorized"
}
}
}
}
}
非常感谢你。
即使在GitHub上使用示例代码，我在遵循相同（优秀）教程时也遇到了同样的问题。为了解决这个问题，我必须做两件事：
首先，在代码的开头添加request.endAudio()以停止在startButtonTapped操作中的记录。这标志着录音的结束。我看到你已经在示例代码中完成了这一点。
其次，在recordAndRecognizeSpeech函数中，当'recognitionTask'开始时，如果没有检测到语音，则'result'将为nil并且触发错误情况。所以，在尝试分配结果之前，我测试了result != nil。
因此，这两个函数的代码如下所示：1。更新了startButtonTapped：
@IBAction func startButtonTapped(_ sender: UIButton) {
if isRecording {
request.endAudio() // Added line to mark end of recording
audioEngine.stop()
if let node = audioEngine.inputNode {
node.removeTap(onBus: 0)
}
recognitionTask?.cancel()
isRecording = false
startButton.backgroundColor = UIColor.gray
} else {
self.recordAndRecognizeSpeech()
isRecording = true
startButton.backgroundColor = UIColor.red
}
}
并且2.在recordAndRecognizeSpeech线内更新recognitionTask = ...：
recognitionTask = speechRecognizer?.recognitionTask(with: request, resultHandler: { (result, error) in
if result != nil { // check to see if result is empty (i.e. no speech found)
if let result = result {
let bestString = result.bestTranscription.formattedString
self.detectedTextLabel.text = bestString
var lastString: String = ""
for segment in result.bestTranscription.segments {
let indexTo = bestString.index(bestString.startIndex, offsetBy: segment.substringRange.location)
lastString = bestString.substring(from: indexTo)
}
self.checkForColoursSaid(resultString: lastString)
} else if let error = error {
self.sendAlert(message: "There has been a speech recognition error")
print(error)
}
}
})
我希望能帮助你。
这将防止两个错误：上面提到的Code = 216并且'SFSpeechAudioBufferRecognitionRequest无法重用'错误。
像这样：
// stop recognition
recognitionTask?.finish()
recognitionTask = nil
// stop audio
request.endAudio()
audioEngine.stop()
audioEngine.inputNode.removeTap(onBus: 0) // Remove tap on bus when stopping recording.
附： audioEngine.inputNode似乎不再是一个可选值，因此我使用no来构造。
嘿，我得到了同样的错误，但现在它的工作绝对正常。这个代码对你有帮助:)。
import UIKit
import Speech
class SpeechVC: UIViewController {
@IBOutlet weak var slabel: UILabel!
@IBOutlet weak var sbutton: UIButton!
let audioEngine = AVAudioEngine()
let SpeechRecognizer : SFSpeechRecognizer? = SFSpeechRecognizer()
let request = SFSpeechAudioBufferRecognitionRequest()
var recognitionTask:SFSpeechRecognitionTask?
var isRecording = false
override func viewDidLoad() {
super.viewDidLoad()
self.requestSpeechAuthorization()
// Do any additional setup after loading the view, typically from a nib.
}
func recordAndRecognizeSpeech()
{
guard let node = audioEngine.inputNode else { return }
let recordingFormat = node.outputFormat(forBus: 0)
node.installTap(onBus: 0, bufferSize: 1024, format: recordingFormat) { buffer , _ in
self.request.append(buffer)
}
audioEngine.prepare()
do
{
try audioEngine.start()
}catch
{
return print(error)
}
guard let myRecognizer = SFSpeechRecognizer() else {
return
}
if !myRecognizer.isAvailable
{
return
}
recognitionTask = SpeechRecognizer?.recognitionTask(with: request, resultHandler: { result, error in
if let result = result
{
let bestString = result.bestTranscription.formattedString
self.slabel.text = bestString
var lastString : String = ""
for segment in result.bestTranscription.segments
{
let indexTo = bestString.index(bestString.startIndex, offsetBy: segment.substringRange.location)
lastString = bestString.substring(from: indexTo)
}
}else if let error = error
{
print(error)
}
})
}
@IBAction func startAction(_ sender: Any) {
if isRecording == true
{
audioEngine.stop()
recognitionTask?.cancel()
isRecording = false
sbutton.backgroundColor = UIColor.gray
}
else{
self.recordAndRecognizeSpeech()
isRecording = true
sbutton.backgroundColor = UIColor.red
}
}
func cancelRecording()
{
audioEngine.stop()
if let node = audioEngine.inputNode
{
audioEngine.inputNode?.removeTap(onBus: 0)
}
recognitionTask?.cancel()
}
func requestSpeechAuthorization()
{
SFSpeechRecognizer.requestAuthorization { authStatus in
OperationQueue.main.addOperation {
switch authStatus
{
case .authorized :
self.sbutton.isEnabled = true
case .denied :
self.sbutton.isEnabled = false
self.slabel.text = "User denied access to speech recognition"
case .restricted :
self.sbutton.isEnabled = false
self.slabel.text = "Speech Recognition is restricted on this Device"
case .notDetermined :
self.sbutton.isEnabled = false
self.slabel.text = "Speech Recognition not yet authorized"
}
}
}
}
}
我有这个错误，因为我在模拟器上运行应用程序。在常规设备上运行可以解决问题。