[Do it!] 오디오 앱

CoCoral·2023년 10월 22일
doitiOSswift스위프트앱개발
1

Do it!

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19/25
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Do it! 스위프트로 아이폰 앱 만들기
13장 음악 재생하고 녹음하기

📱 실행 화면 📱

💻 Step 1. 기본 환경 구성하기

  • 'Audio Player' 레이블 배치하기
  • Progress View 를 그 아래에 배치하기
  • Progress View 아래에 시간을 나타내기 위한 레이블 2개 배치하기
  • 'Play', 'Pause', 'Stop' 3개의 버튼 배치하기
  • 'Volume' 레이블 배치하기
  • Slider 를 그 오른쪽에 배치하기

  • 가로로 나란히 배치된 컴포넌트들을 다중 선택한 후 메뉴에서
    [Editor] -> [Embed In] -> [Stack View] 를 통해 묶어주기 (가로 스택 뷰)
  • 모든 컴포넌트를 선택하여 같은 방식으로 묶어주기 (세로 스택 뷰)
  • 세로 스택 뷰를 선택하고 [Align] -> [Horizontally in Container] 체크하여 수평 가운데 정렬 적용하기
  • [Add New Constrains] 에서 위 간격을 40으로 설정하기

  • Progress View 을 선택하고 [Add New Constraints] -> [Width] = 280 설정하기
  • 'currentTime', 'endTime' 을 선택하고 [Add New Constraints] -> [Width] = 100 설정하기
    • 각 레이블의 [Size inspector] 에서 Width 의 부호를 [>=] 로 변경하기
  • Slider 를 선택하고 [Add New Constraints] -> [Width] = 230 설정하기
    • [Size inspector] 에서 Width 의 부호를 [>=] 로 변경하기

💻 Step 2. Outlet 변수와 Action 함수 추가하기


💻 Step 3. 오디오 재생을 위한 초기화하기

import UIKit
import AVFoundation

class ViewController: UIViewController, AVAudioPlayerDelegate {
    
    var audioPlayer: AVAudioPlayer!
    var audioFile: URL!
    let MAX_VOLUME: Float = 10.0
    var progressTimer: Timer!

    @IBOutlet var pvProgressPlay: UIProgressView!
    @IBOutlet var lblCurrentTime: UILabel!
    @IBOutlet var lblEndTime: UILabel!
    @IBOutlet var btnPlay: UIButton!
    @IBOutlet var btnPause: UIButton!
    @IBOutlet var btnStop: UIButton!
    @IBOutlet var slVolume: UISlider!
    
    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view.
        audioFile = Bundle.main.url(forResource: "Sicilian_Breeze", withExtension: "mp3")
        initPlay()
    }
    
    func initPlay() {
        do {
            audioPlayer = try AVAudioPlayer(contentsOf: audioFile)
        } catch let error as NSError {
            print("Error-initPlay : \(error)")
        }
        slVolume.maximumValue = MAX_VOLUME
        slVolume.value = 1.0
        pvProgressPlay.progress = 0
        
        audioPlayer.delegate = self
        audioPlayer.prepareToPlay()
        audioPlayer.volume = slVolume.value
    }
  • prepareToPlay()
    • 오디오 파일을 로드하고 초기화 작업을 수행하는 함수
    • 오디오 데이터가 메모리에 사전 캐시되도록 한다.
    • 볼륨 조절, 반복 모드 설정 등의 환경 설정이 가능하다.
    • 버퍼링을 처리하여 지연 없이 연속적인 재생이 가능하게 한다.

💻 Step 4. 재생 시간 초기화하기

func initPlay() {
    ...
    
    lblEndTime.text = convertNSTimeInterval2String(audioPlayer.duration)
    lblCurrentTime.text = convertNSTimeInterval2String(0)
}

func convertNSTimeInterval2String(_ time:TimeInterval) -> String {
    let min = Int(time/60)
    let sec = Int(time.truncatingRemainder(dividingBy: 60))
    let strTime = String(format: "%02d:%02d", min, sec)
    return strTime
}

💻 Step 5. [재생], [일시 정지], [정지] 버튼 제어하기

func initPlay() {
    ...
    
    setPlayButtons(true, pause: false, stop: false)
}

func setPlayButtons(_ play:Bool, pause:Bool, stop:Bool) {
    btnPlay.isEnabled = play
    btnPlay.isEnabled = pause
    btnStop.isEnabled = stop
}

@IBAction func btnPlayAudio(_ sender: UIButton) {
    audioPlayer.play()
    setPlayButtons(false, pause: true, stop: true)
}
@IBAction func btnPauseAudio(_ sender: UIButton) {
    audioPlayer.pause()
    setPlayButtons(true, pause: false, stop: true)
}
@IBAction func btnStopAudio(_ sender: UIButton) {
    audioPlayer.stop()
    setPlayButtons(true, pause: false, stop: false)
}

💻 Step 6. 재생 시간 표시하고 볼륨 제어하기

class ViewController: UIViewController, AVAudioPlayerDelegate {
    ...
    
    let timePlayerSelector:Selector = #selector(ViewController.updatePlayTime)

    ...
    
    @IBAction func btnPlayAudio(_ sender: UIButton) {
        ...
        
        progressTimer = Timer.scheduledTimer(timeInterval: 0.1, target: self, selector: timePlayerSelector, userInfo: nil, repeats: true)
    }
    @objc func updatePlayTime() {
        lblCurrentTime.text = convertNSTimeInterval2String(audioPlayer.currentTime)
        pvProgressPlay.progress = Float(audioPlayer.currentTime/audioPlayer.duration)
    }
    
    @IBAction func btnStopAudio(_ sender: UIButton) {
        audioPlayer.stop()
        audioPlayer.currentTime = 0
        lblCurrentTime.text = convertNSTimeInterval2String(0)
        setPlayButtons(true, pause: false, stop: false)
        progressTimer.invalidate()
    }
    @IBAction func slChangeVolume(_ sender: UISlider) {
        audioPlayer.volume = slVolume.value
    }
    
    func audioPlayerDidFinishPlaying(_ player: AVAudioPlayer, successfully flag: Bool) {
        progressTimer.invalidate()
        setPlayButtons(true, pause: false, stop: false)
    }
}
  • [Play] 버튼을 누르면 0.1초마다 타이머가 구동되고, 구동될 때마다 updatePlayTime() 함수가 실행된다.
  • [Stop] 버튼을 누르거나 오디오 재생이 끝나면 타이머를 무효화시킨다.

💻 Step 7. 녹음을 위한 스토리보드 꾸미기

  • 'Record' 레이블과 Switch(Off) 배치하기
    • 가로 스택 뷰로 묶어주기
  • 'Record' 버튼과 '00:00' 레이블 배치하기
    • 가로 스택 뷰로 묶어주기
  • 두 스택 뷰를 세로 스택 뷰로 묶어 주기
  • [Align] -> [Horizontally in Container] 설정하기
  • 세로 스택 뷰를 우클릭 드래그하여 상단 세로 스택 뷰에 놓고 [Vertical Spacing] 선택하기

💻 Step 8. 녹음을 위한 Outlet 변수와 Action 함수 추가하기

  • 'Record' 버튼과 시간 레이블에 대한 아웃렛 변수 추가하기
  • Switch 와 'Record' 버튼에 대한 액션 함수 추가하기

💻 Step 9. 녹음을 위한 초기화하기

class ViewController: UIViewController, AVAudioPlayerDelegate, AVAudioRecorderDelegate {
    ...
    
    var audioRecorder: AVAudioRecorder!
    var isRecordMode = false
    
    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view.
        selectAudioFile()
        if !isRecordMode {
            initPlay()
            btnRecord.isEnabled = false
            lblRecordTime.isEnabled = false
        }
        else {
            initRecord()
        }
    }
    
    func selectAudioFile() {
        if !isRecordMode {
            audioFile = Bundle.main.url(forResource: "Sicilian_Breeze", withExtension: "mp3")
        }
        else {
            let documentDirectory = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask)[0]
            audioFile = documentDirectory.appendingPathComponent("recordFile.m4a")
        }
    }
    
    func initRecord() {
        let recordSettings = [
            AVFormatIDKey: NSNumber(value: kAudioFormatAppleLossless as UInt32),    //포맷
            AVEncoderAudioQualityKey: AVAudioQuality.max.rawValue,  //최대 음질
            AVEncoderBitRateKey: 320000,    //비트율
            AVNumberOfChannelsKey: 2,   //오디오 채널
            AVSampleRateKey: 44100.0] as [String : Any]     //샘플률
        
        do {
            audioRecorder = try AVAudioRecorder(url: audioFile, settings: recordSettings)
        } catch let error as NSError {
            print("Error-initRecord : \(error)")
        }
        audioRecorder.delegate = self
        
        slVolume.value = 1.0
        audioPlayer.volume = slVolume.value
        lblEndTime.text = convertNSTimeInterval2String(0)
        lblCurrentTime.text = convertNSTimeInterval2String(0)
        setPlayButtons(false, pause: false, stop: false)
        
        let session = AVAudioSession.sharedInstance()
        do {
            try AVAudioSession.sharedInstance().setCategory(.playback, mode: .default)
            try AVAudioSession.sharedInstance().setActive(true)
        } catch let error as NSError {
            print(" Error-setCategory : \(error)")
        }
        do {
            try session.setActive(true)
        } catch let error as NSError {
            print(" Error-setActive : \(error)")
        }
    }
  • isRecordMode 값에 따라 audioFile 과 초기화를 다르게 설정하기
    • 녹음 모드라면 문서 디렉토리에 새로운 파일 생성하기
    • 일반적으로 앱은 하나의 문서 디렉토리를 가지므로 첫번째 요소가 사용된다.
  • AVAudioSession: iOS 에서 오디오 관련 작업을 제어하기 위한 인터페이스
    • 앱에서 오디오를 재생하거나 녹음하려면 AVAudioSession 인스턴스를 사하여 앱의 오디오 동작 환경을 구성해야 한다.
    • sharedInstance(): 앱 전체에서 동일한 오디오 세션 설정에 접근할 수 있도록 해준다.
    • setCategory(): 앱이 주로 오디오 재생에 사용될 것임을 나타낸다.
    • setActive(): 오디오 세션을 활성화하고 다른 앱이나 시스템과 충돌하지 않도록 한다.

💻 Step 10. 녹음 및 재생 모드 변경하기

@IBAction func swRecordMode(_ sender: UISwitch) {
    if sender.isOn {
        audioPlayer.stop()
        audioPlayer.currentTime = 0
        lblRecordTime!.text = convertNSTimeInterval2String(0)
        isRecordMode = true
        btnRecord.isEnabled = true
        lblRecordTime.isEnabled = true
    }
    else {
        isRecordMode = false
        btnRecord.isEnabled = false
        lblRecordTime.isEnabled = false
        lblRecordTime.text = convertNSTimeInterval2String(0)
    }
    selectAudioFile()
    if !isRecordMode {
        initPlay()
    }
    else {
        initRecord()
    }
}

💻 Step 11. 녹음하기

@IBAction func btnRecord(_ sender: UIButton) {
    if (sender as AnyObject).titleLabel?.text == "Record" {
        audioRecorder.record()
        (sender as AnyObject).setTitle("Stop", for: UIControl.State())
    }
    else {
        audioRecorder.stop()
        (sender as AnyObject).setTitle("Record", for: UIControl.State())
        btnPlay.isEnabled = true
        initPlay()
    }
}

💻 Step 12. 녹음 시간 표시하기

class ViewController: UIViewController, AVAudioPlayerDelegate, AVAudioRecorderDelegate {
    ...
    
    let timeRecordSelector:Selector = #selector(ViewController.updateRecordTime)
    ...
    
    @IBAction func btnRecord(_ sender: UIButton) {
        if (sender as AnyObject).titleLabel?.text == "Record" {
            audioRecorder.record()
            (sender as AnyObject).setTitle("Stop", for: UIControl.State())
            progressTimer = Timer.scheduledTimer(timeInterval: 0.1, target: self, selector: timeRecordSelector, userInfo: nil, repeats: true)
        }
        else {
            audioRecorder.stop()
            progressTimer.invalidate()
            (sender as AnyObject).setTitle("Record", for: UIControl.State())
            btnPlay.isEnabled = true
            initPlay()
        }
    }
    @objc func updateRecordTime() {
        lblRecordTime.text = convertNSTimeInterval2String(audioRecorder.currentTime)
    }
    
}

💻 Final Step. 전체 소스 코드

import UIKit
import AVFoundation

class ViewController: UIViewController, AVAudioPlayerDelegate, AVAudioRecorderDelegate {
    
    var audioPlayer: AVAudioPlayer!
    var audioFile: URL!
    let MAX_VOLUME: Float = 10.0
    var progressTimer: Timer!
    let timePlayerSelector:Selector = #selector(ViewController.updatePlayTime)
    let timeRecordSelector:Selector = #selector(ViewController.updateRecordTime)

    @IBOutlet var pvProgressPlay: UIProgressView!
    @IBOutlet var lblCurrentTime: UILabel!
    @IBOutlet var lblEndTime: UILabel!
    @IBOutlet var btnPlay: UIButton!
    @IBOutlet var btnPause: UIButton!
    @IBOutlet var btnStop: UIButton!
    @IBOutlet var slVolume: UISlider!
    
    @IBOutlet var btnRecord: UIButton!
    @IBOutlet var lblRecordTime: UILabel!
    
    var audioRecorder: AVAudioRecorder!
    var isRecordMode = false
    
    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view.
        selectAudioFile()
        if !isRecordMode {
            initPlay()
            btnRecord.isEnabled = false
            lblRecordTime.isEnabled = false
        }
        else {
            initRecord()
        }
    }
    
    func selectAudioFile() {
        if !isRecordMode {
            audioFile = Bundle.main.url(forResource: "Sicilian_Breeze", withExtension: "mp3")
        }
        else {
            let documentDirectory = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask)[0]
            audioFile = documentDirectory.appendingPathComponent("recordFile.m4a")
        }
    }
    
    func initRecord() {
        let recordSettings = [
            AVFormatIDKey: NSNumber(value: kAudioFormatAppleLossless as UInt32),    //포맷
            AVEncoderAudioQualityKey: AVAudioQuality.max.rawValue,  //최대 음질
            AVEncoderBitRateKey: 320000,    //비트율
            AVNumberOfChannelsKey: 2,   //오디오 채널
            AVSampleRateKey: 44100.0] as [String : Any]     //샘플률
        
        do {
            audioRecorder = try AVAudioRecorder(url: audioFile, settings: recordSettings)
        } catch let error as NSError {
            print("Error-initRecord : \(error)")
        }
        audioRecorder.delegate = self
        
        slVolume.value = 1.0
        audioPlayer.volume = slVolume.value
        lblEndTime.text = convertNSTimeInterval2String(0)
        lblCurrentTime.text = convertNSTimeInterval2String(0)
        setPlayButtons(false, pause: false, stop: false)
        
        let session = AVAudioSession.sharedInstance()
        do {
            try AVAudioSession.sharedInstance().setCategory(.playback, mode: .default)
            try AVAudioSession.sharedInstance().setActive(true)
        } catch let error as NSError {
            print(" Error-setCategory : \(error)")
        }
        do {
            try session.setActive(true)
        } catch let error as NSError {
            print(" Error-setActive : \(error)")
        }
    }
    
    func initPlay() {
        do {
            audioPlayer = try AVAudioPlayer(contentsOf: audioFile)
        } catch let error as NSError {
            print("Error-initPlay : \(error)")
        }
        slVolume.maximumValue = MAX_VOLUME
        slVolume.value = 1.0
        pvProgressPlay.progress = 0
        
        audioPlayer.delegate = self
        audioPlayer.prepareToPlay()
        audioPlayer.volume = slVolume.value
        
        lblEndTime.text = convertNSTimeInterval2String(audioPlayer.duration)
        lblCurrentTime.text = convertNSTimeInterval2String(0)
        
        setPlayButtons(true, pause: false, stop: false)
    }

    func setPlayButtons(_ play:Bool, pause:Bool, stop:Bool) {
        btnPlay.isEnabled = play
        btnPause.isEnabled = pause
        btnStop.isEnabled = stop
    }

    func convertNSTimeInterval2String(_ time:TimeInterval) -> String {
        let min = Int(time/60)
        let sec = Int(time.truncatingRemainder(dividingBy: 60))
        let strTime = String(format: "%02d:%02d", min, sec)
        return strTime
    }

    @IBAction func btnPlayAudio(_ sender: UIButton) {
        audioPlayer.play()
        setPlayButtons(false, pause: true, stop: true)
        progressTimer = Timer.scheduledTimer(timeInterval: 0.1, target: self, selector: timePlayerSelector, userInfo: nil, repeats: true)
    }
    @objc func updatePlayTime() {
        lblCurrentTime.text = convertNSTimeInterval2String(audioPlayer.currentTime)
        pvProgressPlay.progress = Float(audioPlayer.currentTime/audioPlayer.duration)
    }
    
    @IBAction func btnPauseAudio(_ sender: UIButton) {
        audioPlayer.pause()
        setPlayButtons(true, pause: false, stop: true)
    }
    @IBAction func btnStopAudio(_ sender: UIButton) {
        audioPlayer.stop()
        audioPlayer.currentTime = 0
        lblCurrentTime.text = convertNSTimeInterval2String(0)
        setPlayButtons(true, pause: false, stop: false)
        progressTimer.invalidate()
    }
    @IBAction func slChangeVolume(_ sender: UISlider) {
        audioPlayer.volume = slVolume.value
    }
    
    func audioPlayerDidFinishPlaying(_ player: AVAudioPlayer, successfully flag: Bool) {
        progressTimer.invalidate()
        setPlayButtons(true, pause: false, stop: false)
    }
    
    @IBAction func swRecordMode(_ sender: UISwitch) {
        if sender.isOn {
            audioPlayer.stop()
            audioPlayer.currentTime = 0
            lblRecordTime!.text = convertNSTimeInterval2String(0)
            isRecordMode = true
            btnRecord.isEnabled = true
            lblRecordTime.isEnabled = true
        }
        else {
            isRecordMode = false
            btnRecord.isEnabled = false
            lblRecordTime.isEnabled = false
            lblRecordTime.text = convertNSTimeInterval2String(0)
        }
        selectAudioFile()
        if !isRecordMode {
            initPlay()
        }
        else {
            initRecord()
        }
    }
    @IBAction func btnRecord(_ sender: UIButton) {
        if (sender as AnyObject).titleLabel?.text == "Record" {
            audioRecorder.record()
            (sender as AnyObject).setTitle("Stop", for: UIControl.State())
            progressTimer = Timer.scheduledTimer(timeInterval: 0.1, target: self, selector: timeRecordSelector, userInfo: nil, repeats: true)
        }
        else {
            audioRecorder.stop()
            progressTimer.invalidate()
            (sender as AnyObject).setTitle("Record", for: UIControl.State())
            btnPlay.isEnabled = true
            initPlay()
        }
    }
    @objc func updateRecordTime() {
        lblRecordTime.text = convertNSTimeInterval2String(audioRecorder.currentTime)
    }
    
}

💻 도전! Mission 오디오 앱에 재생 상태 이미지 추가하기

  • 이미지 뷰 배치하기

import UIKit
import AVFoundation

class ViewController: UIViewController, AVAudioPlayerDelegate, AVAudioRecorderDelegate {
    
    var audioPlayer: AVAudioPlayer!
    var audioFile: URL!
    let MAX_VOLUME: Float = 10.0
    var progressTimer: Timer!
    let timePlayerSelector:Selector = #selector(ViewController.updatePlayTime)
    let timeRecordSelector:Selector = #selector(ViewController.updateRecordTime)

    @IBOutlet var pvProgressPlay: UIProgressView!
    @IBOutlet var lblCurrentTime: UILabel!
    @IBOutlet var lblEndTime: UILabel!
    @IBOutlet var btnPlay: UIButton!
    @IBOutlet var btnPause: UIButton!
    @IBOutlet var btnStop: UIButton!
    @IBOutlet var slVolume: UISlider!
    
    @IBOutlet var btnRecord: UIButton!
    @IBOutlet var lblRecordTime: UILabel!
    
    @IBOutlet var imgView: UIImageView!
    
    var audioRecorder: AVAudioRecorder!
    var isRecordMode = false
    
    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view.
        selectAudioFile()
        if !isRecordMode {
            initPlay()
            btnRecord.isEnabled = false
            lblRecordTime.isEnabled = false
        }
        else {
            initRecord()
        }
        imgView.image = UIImage(named: "stop.png")
    }
    
    func selectAudioFile() {
        if !isRecordMode {
            audioFile = Bundle.main.url(forResource: "Sicilian_Breeze", withExtension: "mp3")
        }
        else {
            let documentDirectory = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask)[0]
            audioFile = documentDirectory.appendingPathComponent("recordFile.m4a")
        }
    }
    
    func initRecord() {
        let recordSettings = [
            AVFormatIDKey: NSNumber(value: kAudioFormatAppleLossless as UInt32),    //포맷
            AVEncoderAudioQualityKey: AVAudioQuality.max.rawValue,  //최대 음질
            AVEncoderBitRateKey: 320000,    //비트율
            AVNumberOfChannelsKey: 2,   //오디오 채널
            AVSampleRateKey: 44100.0] as [String : Any]     //샘플률
        
        do {
            audioRecorder = try AVAudioRecorder(url: audioFile, settings: recordSettings)
        } catch let error as NSError {
            print("Error-initRecord : \(error)")
        }
        audioRecorder.delegate = self
        
        slVolume.value = 1.0
        audioPlayer.volume = slVolume.value
        lblEndTime.text = convertNSTimeInterval2String(0)
        lblCurrentTime.text = convertNSTimeInterval2String(0)
        setPlayButtons(false, pause: false, stop: false)
        
        let session = AVAudioSession.sharedInstance()
        do {
            try AVAudioSession.sharedInstance().setCategory(.playback, mode: .default)
            try AVAudioSession.sharedInstance().setActive(true)
        } catch let error as NSError {
            print(" Error-setCategory : \(error)")
        }
        do {
            try session.setActive(true)
        } catch let error as NSError {
            print(" Error-setActive : \(error)")
        }
    }
    
    func initPlay() {
        do {
            audioPlayer = try AVAudioPlayer(contentsOf: audioFile)
        } catch let error as NSError {
            print("Error-initPlay : \(error)")
        }
        slVolume.maximumValue = MAX_VOLUME
        slVolume.value = 1.0
        pvProgressPlay.progress = 0
        
        audioPlayer.delegate = self
        audioPlayer.prepareToPlay()
        audioPlayer.volume = slVolume.value
        
        lblEndTime.text = convertNSTimeInterval2String(audioPlayer.duration)
        lblCurrentTime.text = convertNSTimeInterval2String(0)
        
        setPlayButtons(true, pause: false, stop: false)
    }

    func setPlayButtons(_ play:Bool, pause:Bool, stop:Bool) {
        btnPlay.isEnabled = play
        btnPause.isEnabled = pause
        btnStop.isEnabled = stop
    }

    func convertNSTimeInterval2String(_ time:TimeInterval) -> String {
        let min = Int(time/60)
        let sec = Int(time.truncatingRemainder(dividingBy: 60))
        let strTime = String(format: "%02d:%02d", min, sec)
        return strTime
    }

    @IBAction func btnPlayAudio(_ sender: UIButton) {
        audioPlayer.play()
        setPlayButtons(false, pause: true, stop: true)
        progressTimer = Timer.scheduledTimer(timeInterval: 0.1, target: self, selector: timePlayerSelector, userInfo: nil, repeats: true)
        imgView.image = UIImage(named: "play.png")
    }
    @objc func updatePlayTime() {
        lblCurrentTime.text = convertNSTimeInterval2String(audioPlayer.currentTime)
        pvProgressPlay.progress = Float(audioPlayer.currentTime/audioPlayer.duration)
    }
    
    @IBAction func btnPauseAudio(_ sender: UIButton) {
        audioPlayer.pause()
        setPlayButtons(true, pause: false, stop: true)
        imgView.image = UIImage(named: "pause.png")
    }
    @IBAction func btnStopAudio(_ sender: UIButton) {
        audioPlayer.stop()
        audioPlayer.currentTime = 0
        lblCurrentTime.text = convertNSTimeInterval2String(0)
        setPlayButtons(true, pause: false, stop: false)
        progressTimer.invalidate()
        imgView.image = UIImage(named: "stop.png")
    }
    @IBAction func slChangeVolume(_ sender: UISlider) {
        audioPlayer.volume = slVolume.value
    }
    
    func audioPlayerDidFinishPlaying(_ player: AVAudioPlayer, successfully flag: Bool) {
        progressTimer.invalidate()
        setPlayButtons(true, pause: false, stop: false)
        imgView.image = UIImage(named: "stop.png")
    }
    
    @IBAction func swRecordMode(_ sender: UISwitch) {
        if sender.isOn {
            audioPlayer.stop()
            audioPlayer.currentTime = 0
            lblRecordTime!.text = convertNSTimeInterval2String(0)
            isRecordMode = true
            btnRecord.isEnabled = true
            lblRecordTime.isEnabled = true
        }
        else {
            isRecordMode = false
            btnRecord.isEnabled = false
            lblRecordTime.isEnabled = false
            lblRecordTime.text = convertNSTimeInterval2String(0)
        }
        selectAudioFile()
        if !isRecordMode {
            initPlay()
        }
        else {
            initRecord()
        }
    }
    @IBAction func btnRecord(_ sender: UIButton) {
        if (sender as AnyObject).titleLabel?.text == "Record" {
            audioRecorder.record()
            (sender as AnyObject).setTitle("Stop", for: UIControl.State())
            progressTimer = Timer.scheduledTimer(timeInterval: 0.1, target: self, selector: timeRecordSelector, userInfo: nil, repeats: true)
            imgView.image = UIImage(named: "record.png")
        }
        else {
            audioRecorder.stop()
            progressTimer.invalidate()
            (sender as AnyObject).setTitle("Record", for: UIControl.State())
            btnPlay.isEnabled = true
            initPlay()
            imgView.image = UIImage(named: "stop.png")
        }
    }
    @objc func updateRecordTime() {
        lblRecordTime.text = convertNSTimeInterval2String(audioRecorder.currentTime)
    }
    
}
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