Question

我目前正在尝试设置一个AVAudioRecorder来从iPhone上的麦克风中捕获一些用户音频，但是在打开一个可选的＆＃39;时，我一直意外地发现了一个nil。错误。

我不会尝试开始录制，直到用户点按一下按钮，我确定我肯定有麦克风许可。

我的代码如下，我无法看到我出错的地方.recordTapped是挂在按钮上的IBAction，它特别是当我尝试实例化＆＃39;录音机＆＃39;这个崩溃的对象。如果我使用＆＃39;打印＆＃39;，则会填充AudioUrl。声明和设置已设置，所以我不确定这里发生了什么。

@IBAction func recordTapped() {
        if recorder == nil {
            startRecording()
        } else {
            finishRecording(success: true)
        }
    }

    func startRecording() {
        view.backgroundColor = UIColor(red: 0.6, green: 0, blue: 0, alpha: 1)

        recordButton.setTitle("Tap to Stop", forState: .Normal)

        let audioURL = ViewController.getAudioURL()
        let settings = [
            AVFormatIDKey: Int(kAudioFileMPEG4Type),
            AVSampleRateKey: 12000.0,
            AVNumberOfChannelsKey: 1 as NSNumber,
            AVEncoderAudioQualityKey: AVAudioQuality.High.rawValue
        ]

        do {
            recorder = try AVAudioRecorder(URL: audioURL, settings: settings)
            recorder.prepareToRecord()

            recorder.delegate = self
            recorder.record()
        } catch {
            finishRecording(success: false)
        }
    }

    class func getDocumentsDirectory() -> NSString {
        let paths = NSSearchPathForDirectoriesInDomains(.DocumentDirectory, .UserDomainMask, true) as [String]
        let documentsDirectory = paths[0]
        return documentsDirectory
    }

    class func getAudioURL() -> NSURL {
        let audioFilename = getDocumentsDirectory().stringByAppendingPathComponent("audio.m4a")
        let audioURL = NSURL(fileURLWithPath: audioFilename)

        return audioURL
    }

我发现了这个问题Swift, unwrapping nil runtime error for recording audio，但似乎并没有真正适用。

编辑：当我调试它时，在录音机上暂停执行=尝试AVAudioRecorder行，然后转到

libswiftCore.dylib`function signature specialization <Arg[0] = Exploded, Arg[1] = Exploded, Arg[2] = Dead, Arg[3] = Dead> of Swift._fatalErrorMessage (Swift.StaticString, Swift.StaticString, Swift.StaticString, Swift.UInt) -> ():
    0x10027655c <+0>:   stp    x29, x30, [sp, #-16]!
    0x100276560 <+4>:   mov    x29, sp
    0x100276564 <+8>:   sub    sp, sp, #16               ; =16 
    0x100276568 <+12>:  and    w8, w2, #0x1
    0x10027656c <+16>:  tbnz   w8, #0, 0x10027658c       ; <+48>
    0x100276570 <+20>:  tbnz   x1, #63, 0x1002765c8      ; <+108>
    0x100276574 <+24>:  add    x1, x0, x1
    0x100276578 <+28>:  mov    x2, x3
    0x10027657c <+32>:  mov    x3, x4
    0x100276580 <+36>:  mov    x4, x5
    0x100276584 <+40>:  bl     0x1002be5b0               ; function signature specialization <Arg[0] = Exploded, Arg[1] = Exploded> of Swift.(_fatalErrorMessage (Swift.StaticString, Swift.StaticString, Swift.StaticString, Swift.UInt) -> ()).(closure #2)
->  0x100276588 <+44>:  brk    #0x1

输出＆＃39; bt＆＃39;如下：

 * thread #1: tid = 0x71d9f5, 0x000000010036cfc0 libswiftCore.dylib`swift_willThrow, queue = 'com.apple.main-thread', stop reason = breakpoint 2.1
    frame #0: 0x000000010036cfc0 libswiftCore.dylib`swift_willThrow
    frame #1: 0x00000001000ec75c`AVAudioRecorder.__allocating_init(URL : NSURL, settings : [String : AnyObject]) throws -> AVAudioRecorder + 188 at ViewController.swift:0
  * frame #2: 0x00000001000ea480`ViewController.startRecording(self=0x000000015f664ac0) -> () + 1032 at ViewController.swift:112
    frame #3: 0x00000001000ea000`ViewController.recordTapped(self=0x000000015f664ac0) -> () + 164 at ViewController.swift:92
    frame #4: 0x00000001000ea064`@objc ViewController.recordTapped() -> () + 40 at ViewController.swift:0
    frame #5: 0x0000000188868be8 UIKit`-[UIApplication sendAction:to:from:forEvent:] + 100
    frame #6: 0x0000000188868b64 UIKit`-[UIControl sendAction:to:forEvent:] + 80
    frame #7: 0x0000000188850870 UIKit`-[UIControl _sendActionsForEvents:withEvent:] + 436
    frame #8: 0x0000000188868454 UIKit`-[UIControl touchesEnded:withEvent:] + 572
    frame #9: 0x0000000188868084 UIKit`-[UIWindow _sendTouchesForEvent:] + 804
    frame #10: 0x0000000188860c20 UIKit`-[UIWindow sendEvent:] + 784
    frame #11: 0x000000018883104c UIKit`-[UIApplication sendEvent:] + 248
    frame #12: 0x000000018882f628 UIKit`_UIApplicationHandleEventQueue + 6568
    frame #13: 0x000000018368909c CoreFoundation`__CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ + 24
    frame #14: 0x0000000183688b30 CoreFoundation`__CFRunLoopDoSources0 + 540
    frame #15: 0x0000000183686830 CoreFoundation`__CFRunLoopRun + 724
    frame #16: 0x00000001835b0c50 CoreFoundation`CFRunLoopRunSpecific + 384
    frame #17: 0x0000000184e98088 GraphicsServices`GSEventRunModal + 180
    frame #18: 0x000000018889a088 UIKit`UIApplicationMain + 204
    frame #19: 0x00000001000ed528`main + 144 at AppDelegate.swift:12
    frame #20: 0x000000018314e8b8 libdyld.dylib`start + 4

更新：因此，最初的崩溃是由“停止记录”引起的。我没有包括的方法。这基本上是调用recorder.stop（），即使记录器不存在。通过简单的零检查解决了问题。虽然这仍然无法解决以下错误：

  Error Domain=NSOSStatusErrorDomain Code=1718449215 "(null)"

快速谷歌搜索告诉我我使用无效类型进行录制！

对于其他任何看过这个的人来说，事实证明我在录音机的设置中使用的是KAudioFile ...而不是kAudioFormat

感谢

Answer 1

对于其他任何看过这个的人来说，事实证明我在录音机的设置中使用的是KAudioFile ...而不是kAudioFormat

AVAudioRecorder - 在展开可选

1 个答案: