ios: как определить, использовалась ли голосовая диктовка для UITextView? Или была нажата кнопка микрофона на клавиатуре

Вы можете использовать структуру Speech Kit, которую Siri использует для распознавания речи. сначала импортируйте структуру речевого набора и подтвердите, что делегат здесь является быстрой версией. Это может быть полезно

    import Speech

    class ViewController: UIViewController, SFSpeechRecognizerDelegate {

     private var recognitionRequest: SFSpeechAudioBufferRecognitionRequest?
     private var recognitionTask: SFSpeechRecognitionTask?
     private let audioEngine = AVAudioEngine()

     private let speechRecognizer = SFSpeechRecognizer(locale: Locale.init(identifier: "en-US")) 

      override func viewDidLoad() {
        super.viewDidLoad()
        self.authorizeSpeech()
      }

      private func authorizeSpeech() {
        SFSpeechRecognizer.requestAuthorization { (authStatus) in  //4

         var isButtonEnabled = false

         switch authStatus {  //5
          case .authorized:
            isButtonEnabled = true

          case .denied:
           isButtonEnabled = false
           print("User denied access to speech recognition")

          case .restricted:
           isButtonEnabled = false
           print("Speech recognition restricted on this device")

         case .notDetermined:
          isButtonEnabled = false
          print("Speech recognition not yet authorized")
         }

         OperationQueue.main.addOperation() {
            print(isButtonEnabled) //this tells that speech authorized or not
         }
       }
      }


    }

теперь добавьте собственное сообщение в свой info.plist

   <key>NSMicrophoneUsageDescription</key>  <string>Your microphone will be used to record your speech when you press the Start Recording button.</string>

    <key>NSSpeechRecognitionUsageDescription</key>  <string>Speech recognition will be used to determine which words you speak into this device microphone.</string>

теперь создайте новую функцию с именем startRecording ()

func startRecording() {

if recognitionTask != nil {
    recognitionTask?.cancel()
    recognitionTask = nil
}

let audioSession = AVAudioSession.sharedInstance()
do {
    try audioSession.setCategory(AVAudioSessionCategoryRecord)
    try audioSession.setMode(AVAudioSessionModeMeasurement)
    try audioSession.setActive(true, with: .notifyOthersOnDeactivation)
} catch {
    print("audioSession properties weren't set because of an error.")
}

recognitionRequest = SFSpeechAudioBufferRecognitionRequest()

guard let inputNode = audioEngine.inputNode else {
    fatalError("Audio engine has no input node")
}

guard let recognitionRequest = recognitionRequest else {
    fatalError("Unable to create an SFSpeechAudioBufferRecognitionRequest object")
}

recognitionRequest.shouldReportPartialResults = true

recognitionTask = speechRecognizer.recognitionTask(with: recognitionRequest, resultHandler: { (result, error) in

    var isFinal = false

    if result != nil {

        your_text_view.text = result?.bestTranscription.formattedString
        isFinal = (result?.isFinal)!
    }

    if error != nil || isFinal {
        self.audioEngine.stop()
        inputNode.removeTap(onBus: 0)

        self.recognitionRequest = nil
        self.recognitionTask = nil


    }
})

let recordingFormat = inputNode.outputFormat(forBus: 0)
inputNode.installTap(onBus: 0, bufferSize: 1024, format: recordingFormat) { (buffer, when) in
    self.recognitionRequest?.append(buffer)
}

audioEngine.prepare()

do {
    try audioEngine.start()
} catch {
    print("audioEngine couldn't start because of an error.")
}

}

подтвердить делегата

    func speechRecognizer(_ speechRecognizer: SFSpeechRecognizer, availabilityDidChange available: Bool) {
     if available {
        startRecording()
     } else {
      //print("not implement")
     }
    }

Если вы ищете это для скрытия метки-заполнителя, вам поможет один из нижеприведенных.

public func textViewDidChange(_ textView: UITextView) {
    if (textView.text?.isEmpty)! {
        lblPlaceholder?.isHidden = false
    } else {
        lblPlaceholder?.isHidden = true
    }
}