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Today we'll take a look at how to record audio from the microphone on a user's device. Let's get started.

The first thing we'll need is an Audio Session. This will be a singleton (Bite #4), and we'll also create a property to hold our recorder:

import AVFoundation

class RecordViewController : UIViewController {
  let session = AVAudioSession.sharedInstance()
  var recorder: AVAudioRecorder?

Next, we'll create a function to start recording:

func beginRecording() {
  session.requestRecordPermission { granted in
    guard granted else { return }

    do {
      try self.session.setCategory(AVAudioSessionCategoryPlayAndRecord)
      try self.session.setActive(true)

      let recordingFileName = "recording.caf"

      guard let recordingURL = documentsDirectoryURL()?
        .URLByAppendingPathComponent(recordingFileName) else { return }

      let settings: [String : AnyObject] = [
        AVEncoderAudioQualityKey: AVAudioQuality.High.rawValue,
        AVSampleRateKey: 12000.0,
        AVNumberOfChannelsKey: 1,
        AVFormatIDKey: Int(kAudioFormatMPEG4AAC)

      try self.recorder = AVAudioRecorder(
        URL: recordingURL, 
        settings: settings
    } catch { }

We'll first need to request permission from the user to record audio. Once granted, we'll try to set our Audio Session's category to PlayAndRecord, the category Apple suggests for apps that simultaneously record and playback audio.

We'll create a place for our recording to live, then assemble the settings dictionary for our recorder. We instantiate and store our AVAudioRecorder object, then tell it to start recording. Later, we'll call .stop() on it to stop recording. We can also optionally wire up a delegate to get completion callbacks.

Finally, we can play back our file using AVAudioPlayer:

let audioPlayer = try AVAudioPlayer(contentsOfURL: recordingURL)