我创建了一个通过听筒回放的录音机;但是,我想通过扬声器播放。我添加了以下内容(Swift 4):
let audioSession = AVAudioSession.sharedInstance()
do {
try audioSession.overrideOutputAudioPort(AVAudioSession.PortOverride.speaker)
} catch let error as NSError {
print("Audio Session error: \(error.localizedDescription)")
}
当我初始化应用程序时,我可以通过扬声器播放以前的录音;但是,一旦我录制了新的语音备忘录,播放就会回到听筒。我查找了解决方案,但它们都引用了在 Swift 4 中引发错误的 setCategory。
有谁知道如何默认录制的播放到扬声器?
这是我的完整视图控制器:
import UIKit
import AVFoundation
class ViewController2: UIViewController, AVAudioRecorderDelegate, UITableViewDelegate, UITableViewDataSource {
// Setting up Table View
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return numberOfRecords
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "cell", for: indexPath)
cell.textLabel?.text = String(indexPath.row + 1)
return cell
}
func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
let path = getDirectory().appendingPathComponent("\(indexPath.row + 1).m4a")
do {
audioPlayer = try AVAudioPlayer(contentsOf: path)
audioPlayer.play()
}
catch {
}
}
var audioPlayer : AVAudioPlayer!
var recordingSession : AVAudioSession!
var audioRecorder : AVAudioRecorder!
var numberOfRecords : Int = 0
@IBOutlet weak var buttonLabel: UIButton!
@IBOutlet weak var myTableView: UITableView!
@IBAction func record(_ sender: Any) {
// Check if we have an active recorder
if audioRecorder == nil {
numberOfRecords += 1
let filename = getDirectory().appendingPathComponent("\(numberOfRecords).m4a")
let settings = [AVFormatIDKey: Int(kAudioFormatMPEG4AAC),
AVSampleRateKey: 12000,
AVNumberOfChannelsKey: 1,
AVEncoderAudioQualityKey: AVAudioQuality.high.rawValue]
// Start audio recording
do {
audioRecorder = try AVAudioRecorder(url: filename, settings: settings)
audioRecorder.delegate = self
audioRecorder.record()
//buttonLabel.setTitle("Stop", for: .normal)
}
catch {
displayAlert(title: "Oops!", message: "Recording failed")
}
}
else {
// Stop audio recording
audioRecorder.stop()
audioRecorder = nil
UserDefaults.standard.set(numberOfRecords, forKey: "myNumber")
myTableView.reloadData()
//buttonLabel.setTitle("Start", for: .normal)
}
}
override func viewDidLoad() {
super.viewDidLoad()
// Setting up Recording session
recordingSession = AVAudioSession.sharedInstance()
if let number : Int = UserDefaults.standard.object(forKey: "myNumber") as? Int {
numberOfRecords = number
}
AVAudioSession.sharedInstance().requestRecordPermission { (hasPermission) in
if hasPermission {
print ("Accepted")
}
}
// Play speaker instead of earpiece
let audioSession = AVAudioSession.sharedInstance()
do {
try audioSession.overrideOutputAudioPort(AVAudioSession.PortOverride.speaker)
} catch let error as NSError {
print("Audio Session error: \(error.localizedDescription)")
}
// Gesture recognizers
let leftSwipe = UISwipeGestureRecognizer(target: self, action: #selector(swipeAction(swipe:)))
leftSwipe.direction = UISwipeGestureRecognizer.Direction.left
self.view.addGestureRecognizer(leftSwipe)
let rightSwipe = UISwipeGestureRecognizer(target: self, action: #selector(swipeAction(swipe:)))
rightSwipe.direction = UISwipeGestureRecognizer.Direction.right
self.view.addGestureRecognizer(rightSwipe)
let upSwipe = UISwipeGestureRecognizer(target: self, action: #selector(swipeAction(swipe:)))
upSwipe.direction = UISwipeGestureRecognizer.Direction.up
self.view.addGestureRecognizer(upSwipe)
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
// Function that gets path to directory
func getDirectory() -> URL {
let paths = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask)
let documentDirectory = paths[0]
return documentDirectory
}
// Function that displays an alert
func displayAlert(title: String, message: String) {
let alert = UIAlertController(title: title, message: message, preferredStyle: .alert)
alert.addAction(UIAlertAction(title: "dismiss", style: .default, handler: nil))
present(alert, animated: true, completion: nil)
}