我正在尝试使用Apple的SFSpeechRecognition(xcode 9,ios11,swift 4)。以下代码使用计时器来启动语音识别的新请求。我具有后台功能,授予麦克风使用权并授予语音识别功能。如果手机解锁,一切都按预期工作。但是当手机被锁定时,我收到以下错误:
2018-02-20 22:24:47.522562-0500语音识别 - 演示[3505:1234188] [实用工具] + [AFAggregator logDictationFailedWithError:]错误域= kAFAssistantErrorDomain代码= 1700"(null)&# 34;
根据this link,当应用处于后台模式时,语音识别似乎不起作用,但此信息是旧的。我希望有人解决了这个问题,或者找到了解决方法。
有没有人解决过这个问题,或者有人可以提出尝试吗?我的替代方案是要求Apple Watch使用我的应用程序,我真的想避免这样做......
import UIKit
import Speech
class SpeechDetectionViewController: UIViewController,
SFSpeechRecognizerDelegate {
@IBOutlet weak var detectedTextLabel: UILabel!
@IBOutlet weak var colorView: UIView!
@IBOutlet weak var startButton: UIButton!
let audioEngine = AVAudioEngine()
let speechRecognizer: SFSpeechRecognizer? = SFSpeechRecognizer()
var request: SFSpeechAudioBufferRecognitionRequest?
var recognitionTask: SFSpeechRecognitionTask?
var isRecording = false
// timers
var timer = Timer()
let timerInterval = 5.0
var secondsElapsed = 0
// toggle for taking commands
var takeCommands = true
override func viewDidLoad() {
super.viewDidLoad()
self.requestSpeechAuthorization()
timer = Timer.scheduledTimer(timeInterval: timerInterval,target: self,selector: #selector(timerAction(timer:)) ,userInfo: nil,repeats: true)
}
@objc func timerAction(timer:Timer){
/* if takeCommands {
startRecording()
} else {
stopRecording()
}
takeCommands = !takeCommands
print("takeCommands: \(takeCommands)")
*/
startRecording()
}
//MARK: IBActions and Cancel
@IBAction func startButtonTapped(_ sender: UIButton) {
startRecording()
}
func startRecording(){
if isRecording {
print("STOP talking.")
request?.endAudio() // Added line to mark end of recording
request = nil
//audioEngine.stop()
if let node = audioEngine.inputNode {
node.removeTap(onBus: 0)
}
recognitionTask?.cancel()
isRecording = false
startButton.backgroundColor = UIColor.gray
} else {
print("START talking.")
self.recordAndRecognizeSpeech()
isRecording = true
startButton.backgroundColor = UIColor.red
}
}
func stopRecording() {
//audioEngine.stop()
if let node = audioEngine.inputNode {
node.removeTap(onBus: 0)
}
recognitionTask?.cancel()
isRecording = false
startButton.backgroundColor = UIColor.gray
}
//MARK: - Recognize Speech
func recordAndRecognizeSpeech() {
request = SFSpeechAudioBufferRecognitionRequest()
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)
}
if !audioEngine.isRunning {
audioEngine.prepare()
do {
try audioEngine.start()
} catch {
self.sendAlert(message: "There has been an audio engine error.")
return print(error)
}
}
guard let myRecognizer = SFSpeechRecognizer() else {
self.sendAlert(message: "Speech recognition is not supported for your current locale.")
return
}
if !myRecognizer.isAvailable {
self.sendAlert(message: "Speech recognition is not currently available. Check back at a later time.")
// Recognizer is not available right now
return
}
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.checkForColorsSaid(resultString: lastString)
} else if let error = error {
self.sendAlert(message: "There has been a speech recognition error")
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.detectedTextLabel.text = "User denied access to speech recognition"
case .restricted:
self.startButton.isEnabled = false
self.detectedTextLabel.text = "Speech recognition restricted on this device"
case .notDetermined:
self.startButton.isEnabled = false
self.detectedTextLabel.text = "Speech recognition not yet authorized"
}
}
}
}
//MARK: - UI / Set view color.
func checkForColorsSaid(resultString: String) {
switch resultString {
case "red":
colorView.backgroundColor = UIColor.red
case "orange":
colorView.backgroundColor = UIColor.orange
case "yellow":
colorView.backgroundColor = UIColor.yellow
case "green":
colorView.backgroundColor = UIColor.green
case "blue":
colorView.backgroundColor = UIColor.blue
case "purple":
colorView.backgroundColor = UIColor.purple
case "black":
colorView.backgroundColor = UIColor.black
case "white":
colorView.backgroundColor = UIColor.white
case "gray":
colorView.backgroundColor = UIColor.gray
default: break
}
}
//MARK: - Alert
func sendAlert(message: String) {
let alert = UIAlertController(title: "Speech Recognizer Error", message: message, preferredStyle: UIAlertControllerStyle.alert)
alert.addAction(UIAlertAction(title: "OK", style: UIAlertActionStyle.default, handler: nil))
self.present(alert, animated: true, completion: nil)
}
}