保存录制的音频 (Swift) [英] Saving Recorded Audio (Swift)
问题描述
我正在尝试使用 AVAudioRecorder 录制音频，然后将其保存以便以后使用.到目前为止，我已经制作了录音机，它可以很好地完成工作并在录制后播放音频，但是一旦我关闭程序，它就消失了.我能做什么?这是我到目前为止编写的全部代码:
I'm trying to record an audio with AVAudioRecorder and then save it so i can use it later. So far I have Made the Recorder and it does the job well and plays the audio after recording but as soon as i close the program, it's gone. what can I do? Here's the entire code I have written so far :
class RecordViewController: UIViewController , AVAudioPlayerDelegate, AVAudioRecorderDelegate {
@IBOutlet weak var RecordButton: UIButton!
@IBOutlet weak var PlayButton: UIButton!
var soundRecorder : AVAudioRecorder!
var soundPlayer : AVAudioPlayer!
var recordedAudio: RecordedAudio!
var fileName = "audioFile.m4a"
override func viewDidLoad() {
super.viewDidLoad()
setupRecorder()
// Do any additional setup after loading the view.
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
func setupRecorder() {
let recordSettings : [String : AnyObject] =
[
AVFormatIDKey: NSNumber(unsignedInt: kAudioFormatMPEG4AAC),
AVEncoderAudioQualityKey : AVAudioQuality.Max.rawValue as NSNumber,
AVEncoderBitRateKey : 320000 as NSNumber,
AVNumberOfChannelsKey: 2 as NSNumber,
AVSampleRateKey : 44100.0 as NSNumber
]
do {
try soundRecorder = AVAudioRecorder(URL: getFileURL(), settings: recordSettings)
soundRecorder.delegate = self
soundRecorder.prepareToRecord()
} catch {
print(error)
}
}
func getCacheDirectory() -> String {
let paths = NSSearchPathForDirectoriesInDomains(NSSearchPathDirectory.DocumentDirectory, NSSearchPathDomainMask.UserDomainMask, true)
return paths[0]
}
func getFileURL() -> NSURL{
let path = getCacheDirectory().stringByAppendingPathComponent(fileName)
let filePath = NSURL(fileURLWithPath: path)
return filePath
}
func preparePlayer() {
do {
try soundPlayer = AVAudioPlayer(contentsOfURL: getFileURL())
soundPlayer.delegate = self
soundPlayer.prepareToPlay()
soundPlayer.volume = 1.0
} catch {
print(error)
}
}
@IBAction func Record(sender: UIButton) {
if sender.titleLabel?.text! == "Record" {
soundRecorder.record()
sender.setTitle("Stop", forState: .Normal)
PlayButton.enabled = false
} else {
soundRecorder.stop()
sender.setTitle("Record", forState: .Normal)
PlayButton.enabled = false
}
}
@IBAction func PlaySound(sender: UIButton) {
if sender.titleLabel?.text! == "Play" {
RecordButton.enabled = false
sender.setTitle("Stop", forState: .Normal)
preparePlayer()
soundPlayer.play()
} else {
soundPlayer.stop()
sender.setTitle("Play", forState: .Normal)
}
}
func audioRecorderDidFinishRecording(recorder: AVAudioRecorder, successfully flag: Bool) {
PlayButton.enabled = true
recordedAudio = RecordedAudio()
recordedAudio.filePathUrl = recorder.url
recordedAudio.title = recorder.url.lastPathComponent
print(recordedAudio.title)
}
func audioPlayerDidFinishPlaying(player: AVAudioPlayer, successfully flag: Bool) {
RecordButton.enabled = true
PlayButton.setTitle("Play", forState: .Normal)
}
推荐答案
我认为应用退出时文件可能还在，问题是您的 viewDidLoad() 方法立即调用 setupRecorder()，然后使用与上次完全相同的文件名创建一个新的 AVAudioRecorder - 覆盖您的工作.
I think the file is probably still there when the app quits, the problem is that your viewDidLoad() method immediately calls setupRecorder(), which in turn creates a new AVAudioRecorder using exactly the same filename as last time – overwriting your work.
为了帮助您重新安排代码，请转到 audioRecorderDidFinishRecording() 并将 print(recordedAudio.title) 更改为 print(recorder.url).如果您在 iOS 模拟器中运行，它会为您提供一条指向 OS X 磁盘驱动器上确切文件名的长路径.
To help you re-arrange your code, go to audioRecorderDidFinishRecording() and change print(recordedAudio.title) to print(recorder.url). If you're running in the iOS Simulator that will give you a long path to an exact filename on your OS X disk drive.
如果您使用 Finder 浏览那里，您将能够看到您的audioFile.m4a"文件被一次又一次地创建和覆盖，这将让您准确地看到问题发生的时间.如果您想查看确切的问题，请在调用 prepareToPlay() 时在代码中设置断点，检查文件大小，然后按 F6 执行该行代码，然后再次检查文件大小– 你应该看到它被清除了:)
If you browse there using Finder you'll be able to see your "audioFile.m4a" file being created and overwritten again and again, which will let you see exactly when your problem occurs. If you want to see the exact problem, set a breakpoint in your code when you call prepareToPlay(), check your file's size, then press F6 to execute that line of code, then check your file's size again – you should see it being cleared :)
解决方案可能是每次都生成一个新文件名.如果你愿意，你可以使用 NSUUID :
The solution is probably to generate a new filename every time. You could use NSUUID for that if you wanted:
let filename = NSUUID().UUIDString + ".m4a"
您可能会找到 我的 AVAudioRecorder 教程 有用.
You might find my tutorial on AVAudioRecorder useful.
注意:您的 getCacheDirectory() 方法命名不当.它正在获取文档目录，而不是缓存目录，这在尝试调试此类问题时有点牵强.
Note: your getCacheDirectory() method is poorly named. It's fetching the documents directory, not the caches directory, which is a bit of a red herring when trying to debug issues like this.
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