AVAudioFile init在模拟器上工作，但在设备上崩溃。

Question

我想要构建一个iOS应用程序(使用Swift 3和Xcode 8.2.1)，它从iPhone的麦克风记录，并将记录保存到.caf文件中。

首先，我在我的项目的Info.plist文件中添加了以下行：

<key>NSMicrophoneUsageDescription</key>
<string>Some description to explain why access is required</string>

然后，我创建了一个简单的UIViewController，它设置一个AVAudioEngine，并在点击Record和Stop按钮时安装/删除音频按钮。

ViewController.swift

import UIKit
import AVFoundation

class ViewController: UIViewController {

    var engine = AVAudioEngine()
    var file: AVAudioFile?
    var player = AVAudioPlayerNode()

    override func viewDidLoad() {
        super.viewDidLoad()

        guard let url = urlFor(filename: "test.caf") else { return }
        do {
            file = try AVAudioFile(forWriting: url, settings: engine.inputNode!.inputFormat(forBus: 0).settings, commonFormat: engine.inputNode!.inputFormat(forBus: 0).commonFormat, interleaved: false)
        } catch {
            print("Error: \(error)")
        }

        engine.attach(player)
        engine.connect(player, to: engine.mainMixerNode, format: engine.mainMixerNode.outputFormat(forBus: 0))

        do {
            try engine.start()
        } catch {
            print("Error: \(error)")
        }
    }

    @IBAction func record(sender: AnyObject) {
        engine.inputNode?.installTap(onBus: 0, bufferSize: 1024, format: engine.mainMixerNode.outputFormat(forBus: 0)) { (buffer, time) -> Void in
            do {
                try self.file?.write(from: buffer)
            } catch {
                print("Error: \(error)")
            }
        }
    }

    @IBAction func stop(sender: AnyObject) {
        engine.inputNode?.removeTap(onBus: 0)
        // Print the url of the saved file
        let urls = FileManager.default.urls(for: .applicationSupportDirectory, in: .userDomainMask)
        print(urls[urls.endIndex - 1])
    }

    func urlFor(filename: String) -> URL? {
        // Get url of saved file
        if let dir = NSSearchPathForDirectoriesInDomains(FileManager.SearchPathDirectory.documentDirectory, FileManager.SearchPathDomainMask.allDomainsMask, true).first {
            let path = dir.appending(filename)
            return URL(fileURLWithPath: path)
        }
        return nil
    }

}

这个应用程序在模拟器上运行得很好:我可以记录我的声音，抓取记录文件的网址，测试我的声音是否被正确记录。不过，我一在设备上启动该应用程序就会崩溃(在iPhone 10.2.1上使用iOS 6s进行测试)。控制台提供了以下日志：

2017-02-08 17:09:14.330151 AudioEngineSimpleApp[7100:2659416] Audio files cannot be non-interleaved. Ignoring setting AVLinearPCMIsNonInterleaved YES.
2017-02-08 17:09:14.333715 AudioEngineSimpleApp[7100:2659416] [central] 54:   ERROR:    [0x1b7440c40] >avae> AVAudioFile.mm:160: AVAudioFileImpl: error -54
2017-02-08 17:09:14.333796 AudioEngineSimpleApp[7100:2659416] [central] 54:   ERROR:    [0x1b7440c40] >avae> AVAudioFile.mm:122: ReadMagicCookie: error -50
2017-02-08 17:09:14.334369 AudioEngineSimpleApp[7100:2659416] *** Terminating app due to uncaught exception 'com.apple.coreaudio.avfaudio', reason: 'error -50'

这个问题似乎与堆栈溢出线程AVAudioPlayer working on Simulator but not on Real Device有关，但我想不出如何将它的响应实现到我自己的代码中，以解决我的问题。

Answer 1

我重构了我的代码，并用以下urlFor(filename: String) -> URL?属性替换了我的旧url方法：

let url = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask).first!.appendingPathComponent("test.caf")

因此，以下代码在设备上正常工作：

import UIKit
import AVFoundation

class ViewController: UIViewController {

    @IBOutlet weak var recordButton: UIButton!
    let url = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask).first!.appendingPathComponent("test.caf")
    //let url = URL(fileURLWithPath: NSTemporaryDirectory().appending("test.caf")) also works
    var engine = AVAudioEngine()

    override func viewDidLoad() {
        super.viewDidLoad()

        recordButton.setTitle("Record", for: .normal)

        let file: AVAudioFile
        do {
            file = try AVAudioFile(forWriting: url, settings: engine.inputNode!.outputFormat(forBus: 0).settings)
        } catch {
            print("Error: \(error)")
            return
        }

        engine.inputNode?.installTap(onBus: 0, bufferSize: 1024, format: engine.inputNode!.outputFormat(forBus: 0)) { (buffer, time) -> Void in
            do {
                try file.write(from: buffer)
            } catch {
                print("Error: \(error)")
            }
        }
    }

    @IBAction func toggleAction(_ sender: AnyObject) {
        engine.isRunning ? stopRecording() : startRecording()
    }

    func startRecording() {
        do {
            // Start engine
            try engine.start()

            // Toggle button title
            recordButton.setTitle("Stop", for: .normal)
        } catch {
            print("Error: \(error)")
        }
    }

    func stopRecording() {
        // Stop engine
        engine.stop()

        // Toggle button title
        recordButton.setTitle("Record", for: .normal)

        print(url)
    }

}