ios - 无法将记录的文件列出到 TableView

Question

我急需帮助，因为我的头撞在墙上真的很疼。

我有一个 View Controller ，我在其中使用麦克风录制音频并将其保存到应用程序文档目录中。这运行良好，如果我在模拟器中导航到该文件夹​​，我可以看到这些文件。

我的问题是我有一个带有自己的 TableViewController 的 TableView，我想在其中列出包含我的录音的文档目录的内容。我创建了 TableView，它正在读取和填充基于基本数组的表。我的问题是我无法将其转换为读取文档目录内容。

我对该表的 future 目标是允许我通过滑动特定的单元格从该 TableView 中播放、删除或重命名文件。

我已经在这个问题上工作了大约 5 天，我确信我忽略了对你们所有人来说非常简单的事情。

我正在使用 Xcode 7.3.1 和 Swift 2。

提前致谢，我迫不及待地想做出贡献。

ViewControllerRecorder.swift(这是我录制音频并将其保存到正在运行的文档目录的地方。)

import UIKit
import AVFoundation
import PermissionScope

class ViewControllerRecorder: UIViewController, AVAudioRecorderDelegate, AVAudioPlayerDelegate {

    @IBOutlet weak var stopButton: UIButton!
    @IBOutlet weak var recordButton: UIButton!
    @IBOutlet weak var playButton: UIButton!

    @IBOutlet weak var audioDuration: UISlider!


    var audioRecorder:AVAudioRecorder?
    var audioPlayer:AVAudioPlayer?

    let pscope = PermissionScope()


    override func viewDidLoad() {
        super.viewDidLoad()

        audioDuration.value = 0.0

        // Set up permissions
        pscope.addPermission(MicrophonePermission(),
                             message: "Inorder to use this app, you need to grant the microphone permission")

        // Show dialog with callbacks
        pscope.show({ finished, results in
            print("got results \(results)")
            }, cancelled: { (results) -> Void in
                print("thing was cancelled")
        })

        // Disable Stop/Play button when application launches
        stopButton.enabled = false
        playButton.enabled = false




        // Get the document directory. If fails, just skip the rest of the code
        guard let directoryURL = NSFileManager.defaultManager().URLsForDirectory(NSSearchPathDirectory.DocumentDirectory, inDomains: NSSearchPathDomainMask.UserDomainMask).first else {

            let alertMessage = UIAlertController(title: "Error", message: "Failed to get the document directory for recording the audio. Please try again later.", preferredStyle: .Alert)
            alertMessage.addAction(UIAlertAction(title: "OK", style: .Default, handler: nil))
            presentViewController(alertMessage, animated: true, completion: nil)

            return
        }

        // Set the default audio file
        let audioFileURL = directoryURL.URLByAppendingPathComponent("PWAC_" + NSUUID().UUIDString + ".m4a")

        // Setup audio session
        let audioSession = AVAudioSession.sharedInstance()

        do {
            try audioSession.setCategory(AVAudioSessionCategoryPlayAndRecord, withOptions: AVAudioSessionCategoryOptions.DefaultToSpeaker)




            // Define the recorder setting
            let recorderSetting: [String: AnyObject] = [
                AVFormatIDKey: Int(kAudioFormatMPEG4AAC),
                AVSampleRateKey: 32000.0,
                AVNumberOfChannelsKey: 2,
                AVEncoderAudioQualityKey: AVAudioQuality.Medium.rawValue
            ]

            // Initiate and prepare the recorder
            audioRecorder = try AVAudioRecorder(URL: audioFileURL, settings: recorderSetting)
            audioRecorder?.delegate = self
            audioRecorder?.meteringEnabled = true
            audioRecorder?.prepareToRecord()

        } catch {
            print(error)
        }

    }


    func updateaudioDuration(){

        audioDuration.value = Float(audioPlayer!.currentTime)
    }

    @IBAction func sliderAction(sender: AnyObject) {


        audioPlayer!.currentTime = NSTimeInterval(audioDuration.value)

    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }

    @IBAction func play(sender: AnyObject) {
        if let recorder = audioRecorder {
            if !recorder.recording {
                do {
                    audioPlayer = try AVAudioPlayer(contentsOfURL: recorder.url)

                    audioDuration.maximumValue = Float(audioPlayer!.duration)
                    _ = NSTimer.scheduledTimerWithTimeInterval(0.05, target: self, selector: #selector(ViewControllerRecorder.updateaudioDuration), userInfo: nil, repeats: true)

                    audioPlayer?.delegate = self
                    audioPlayer?.play()
                    playButton.setImage(UIImage(named: "playing"), forState: UIControlState.Selected)
                    playButton.selected = true
                } catch {
                    print(error)
                }
            }
        }
    }

    @IBAction func stop(sender: AnyObject) {
        recordButton.setImage(UIImage(named: "record"), forState: UIControlState.Normal)
        recordButton.selected = false
        playButton.setImage(UIImage(named: "play"), forState: UIControlState.Normal)
        playButton.selected = false

        stopButton.enabled = false
        playButton.enabled = true

        audioRecorder?.stop()

        let audioSession = AVAudioSession.sharedInstance()

        do {
            try audioSession.setActive(false)
        } catch {
            print(error)
        }
    }

    @IBAction func record(sender: AnyObject) {
        // Stop the audio player before recording
        if let player = audioPlayer {
            if player.playing {
                player.stop()
                playButton.setImage(UIImage(named: "play"), forState: UIControlState.Normal)
                playButton.selected = false
            }
        }

        if let recorder = audioRecorder {
            if !recorder.recording {
                let audioSession = AVAudioSession.sharedInstance()

                do {
                    try audioSession.setActive(true)

                    // Start recording
                    recorder.record()
                    recordButton.setImage(UIImage(named: "recording"), forState: UIControlState.Selected)
                    recordButton.selected = true


                } catch {
                    print(error)
                }

            } else {
                // Pause recording
                recorder.pause()
                recordButton.setImage(UIImage(named: "pause"), forState: UIControlState.Normal)
                recordButton.selected = false
            }
        }

        stopButton.enabled = true
        playButton.enabled = false

    }


    // MARK: - AVAudioRecorderDelegate Methods
    func audioRecorderDidFinishRecording(recorder: AVAudioRecorder, successfully flag: Bool) {
        if flag {

            // iOS8 and later
            let alert = UIAlertController(title: "Recorder",
                                          message: "Finished Recording",
                                          preferredStyle: .Alert)
            alert.addAction(UIAlertAction(title: "Keep", style: .Default, handler: {action in
                print("keep was tapped")
            }))
            alert.addAction(UIAlertAction(title: "Delete", style: .Default, handler: {action in
                print("delete was tapped")
                self.audioRecorder!.deleteRecording()
            }))

            self.presentViewController(alert, animated:true, completion:nil)

//            let alertMessage = UIAlertController(title: "Finish Recording", message: "Successfully recorded the audio!", preferredStyle: .Alert)
//            alertMessage.addAction(UIAlertAction(title: "OK", style: .Default, handler: nil))
//            presentViewController(alertMessage, animated: true, completion: nil)
            print("Audio has finished recording")
            print(recorder.url)
        }
    }

    // MARK: - AVAudioPlayerDelegate Methods
    func audioPlayerDidFinishPlaying(player: AVAudioPlayer, successfully flag: Bool) {
        playButton.setImage(UIImage(named: "play"), forState: UIControlState.Normal)
        playButton.selected = false

        let alertMessage = UIAlertController(title: "Finish Playing", message: "Finish playing the recording!", preferredStyle: .Alert)
        alertMessage.addAction(UIAlertAction(title: "OK", style: .Default, handler: nil))
        presentViewController(alertMessage, animated: true, completion: nil)
        print("Audio has finished playing")
        print(player.url)
    }


}

ViewControllerFileManager.swift(这是我要将文档目录的内容显示到 TableView 的 View Controller 。)

2016/07/27 更新

import UIKit

class ViewControllerFileManager: UIViewController, UITableViewDataSource, UITableViewDelegate {

var arrayRecordings = [String]()

override func viewDidLoad() {
    super.viewDidLoad()

    let fileManager = NSFileManager.defaultManager()
    let dirPath = NSBundle.mainBundle().resourcePath!


    let items = try! fileManager.contentsOfDirectoryAtPath(dirPath)

    for item in items {
        if item.hasSuffix("m4a") {

            arrayRecordings.append(item)

        }
        print("Found \(item)")
    }



    // Do any additional setup after loading the view, typically from a nib.
}

override func didReceiveMemoryWarning() {
    super.didReceiveMemoryWarning()
    // Dispose of any resources that can be recreated.
}


func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
    // Return the number of rows in the section.
    return arrayRecordings.count
}

func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {

    let cellIdentifier = "Cell"
    let cell = tableView.dequeueReusableCellWithIdentifier(cellIdentifier, forIndexPath: indexPath)



    // Configure the cell...


    cell.textLabel?.text = arrayRecordings[indexPath.row]
    return cell
}

override func prefersStatusBarHidden() -> Bool {
    return true
}

}

Answer 1

如果是在viewDidLoad中填充数组，需要调用tableView的reloadData来刷新。

override func viewDidLoad()
 {
   super.viewDidLoad()

   // populate recordingFileNames here

   // refresh your table
   reloadTableViewContent()
 } 

 func reloadTableViewContent()
 {
    dispatch_async(dispatch_get_main_queue(), { () -> Void in
      self.tableView.reloadData()
      self.tableView.scrollRectToVisible(CGRectMake(0, 0, 1, 1), animated: false)
    })
 }