Swift Minimum Realtime Speech Recognition Code

Yuki Mishima — Tue, 29 Jan 2019 12:01:15 +0000

Preparation

Add these settings to Info.plist.

    <key>NSSpeechRecognitionUsageDescription</key>
    <string>[description]</string>
    <key>NSMicrophoneUsageDescription</key>
    <string>[description]</string>

Code

import UIKit
import Speech

class ViewController: UIViewController {

    private let speechRecognizer = SFSpeechRecognizer(locale: Locale(identifier: "ja-JP"))!
    private var recognitionRequest: SFSpeechAudioBufferRecognitionRequest?
    private var recognitionTask: SFSpeechRecognitionTask?
    private let audioEngine = AVAudioEngine()

    override func viewDidLoad() {
        super.viewDidLoad()

        requestRecognizerAuthorization()
        try? start()
    }

    private func requestRecognizerAuthorization() {
        SFSpeechRecognizer.requestAuthorization { (authStatus) in
        }
    }

    private func start() throws {
        if let recognitionTask = recognitionTask {
            recognitionTask.cancel()
            self.recognitionTask = nil
        }

        let audioSession = AVAudioSession.sharedInstance()
        try audioSession.setCategory(.record, mode: .measurement, options: [])
        try audioSession.setActive(true, options: .notifyOthersOnDeactivation)

        let recognitionRequest = SFSpeechAudioBufferRecognitionRequest()
        self.recognitionRequest = recognitionRequest
        recognitionRequest.shouldReportPartialResults = true
        recognitionTask = speechRecognizer.recognitionTask(with: recognitionRequest) { [weak self] (result, error) in
            guard let `self` = self else { return }

            var isFinal = false

            if let result = result {
                print(result.bestTranscription.formattedString)
                isFinal = result.isFinal
            }

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

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

        audioEngine.prepare()
        try? audioEngine.start()
    }

    private func stop() {
        audioEngine.stop()
        recognitionRequest?.endAudio()
    }

}

Swift Version

Apple Swift version 4.2 (swiftlang-1000.11.37.1 clang-1000.11.45.1)
Target: x86_64-apple-darwin18.2.0

Reference

Swift Minimum GET/POST Request Codes

Yuki Mishima — Mon, 14 Jan 2019 02:14:14 +0000

Copy and paste these codes and get started making an app!

GET Code

let url = URL(string: "https://httpbin.org/get")!
let task = URLSession.shared.dataTask(with: url) { (data, response, error) in
    if let error = error {
        print("error: \(error)")
    } else {
        if let response = response as? HTTPURLResponse {
            print("statusCode: \(response.statusCode)")
        }
        if let data = data, let dataString = String(data: data, encoding: .utf8) {
            print("data: \(dataString)")
        }
    }
}
task.resume()

POST Code

let url = URL(string: "https://httpbin.org/post")!
var request = URLRequest(url: url)
request.httpMethod = "POST"
let task = URLSession.shared.dataTask(with: request) { (data, response, error) in
    if let error = error {
        print("error: \(error)")
    } else {
        if let response = response as? HTTPURLResponse {
            print("statusCode: \(response.statusCode)")
        }
        if let data = data, let dataString = String(data: data, encoding: .utf8) {
            print("data: \(dataString)")
        }
    }
}
task.resume()

Swift Version

Apple Swift version 4.2 (swiftlang-1000.11.37.1 clang-1000.11.45.1)
Target: x86_64-apple-darwin18.2.0

Forem: Yuki Mishima

Swift Minimum Realtime Speech Recognition Code

Preparation

Code

Swift Version

Reference

Swift Minimum GET/POST Request Codes

GET Code

POST Code

Swift Version