How to record Audio using AudioRecorder in iOS Swift

Well, its really easy for recording audio in an iOS application.

We will decalre two variables in our View Controller

var recordingSession: AVAudioSession!
var audioRecorder: AVAudioRecorder!

Request Permisson from the User

recordingSession = AVAudioSession.sharedInstance()

do {
    try recordingSession.setCategory(AVAudioSessionCategoryPlayAndRecord)
    try recordingSession.setActive(true)
    recordingSession.requestRecordPermission() { [unowned self] allowed in
        DispatchQueue.main.async {
            if allowed {
                self.loadRecordingUI()
            } else {
                // failed to record!
            }
        }
    }
} catch {
    // failed to record!
}

Start Recording

func startRecording() {
    let audioFilename = getDocumentsDirectory()
                        .appendingPathComponent("my_recording.m4a")

    let settings = [
        AVFormatIDKey: Int(kAudioFormatMPEG4AAC),
        AVSampleRateKey: 12000,
        AVNumberOfChannelsKey: 1,
        AVEncoderAudioQualityKey: AVAudioQuality.high.rawValue
    ]

    do {
        audioRecorder = try AVAudioRecorder(
              url: audioFilename, settings: settings)
        audioRecorder.delegate = self
        audioRecorder.record()
    } catch {
        finishRecording(success: false)
    }
}

func getDocumentsDirectory() -> URL {
    let paths = FileManager.default.urls(for: 
                       .documentDirectory, in: .userDomainMask)
    let documentsDirectory = paths[0]
    return documentsDirectory
}

Set Delegate

class ViewController: UIViewController, AVAudioRecorderDelegate

Finish Recording

func finishRecording(success: Bool) {
    audioRecorder.stop()
    audioRecorder = nil

    if success {
        // recording finished
    } else {
        // recording failed
    }
}

Note :

Sometimes iOS Stops the recording when a phone call comes.
In that case we need to handle this. Since the delegate is our viewcontroller we can handle this using the delegate function audioRecorderDidFinishRecording

func audioRecorderDidFinishRecording(
     _ recorder: AVAudioRecorder, successfully flag: Bool) {
    if !flag {
        finishRecording(success: false)
    }
}

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