Question

以下是代码的一部分：

类AudioRecorderController：UIViewController，AVAudioRecorderDelegate {

var audioRecorder: AVAudioRecorder?

func audioRecordingPath() -> NSURL {

    let fileManager = NSFileManager()

    let documentsFolderUrl = fileManager.URLForDirectory(.DocumentDirectory, inDomain: .UserDomainMask, appropriateForURL: nil, create: false, error: nil)

    return documentsFolderUrl!.URLByAppendingPathComponent("Recording.m4a")

}


func audioRecordingSettings() -> NSDictionary {...}

func startRecordingAudio() {

    var error: NSError?

    let audioRecordingURL = self.audioRecordingPath()

    audioRecorder = AVAudioRecorder(URL: audioRecordingURL, settings: audioRecordingSettings() as [NSObject: AnyObject], error: &error)

    if let recorder = audioRecorder {

        recorder.delegate = self

        if recorder.prepareToRecord() && recorder.record() {

            println("Capture Succeed!")

            let delayInSeconds = 5.0
            let delayInNanoSeconds = dispatch_time(DISPATCH_TIME_NOW, Int64(delayInSeconds * Double(NSEC_PER_SEC)))
            dispatch_after(delayInNanoSeconds, dispatch_get_main_queue(), {
                [weak self] in
                self!.audioRecorder!.stop()
                //It breaks here. 
                })

        } 
    }
}

它在控制台中打印“Capture succeed”，然后崩溃，错误“在展开Optional值时意外发现nil”。最后一行代码有什么问题？

Answer 1

您是否尝试过更换

self!.audioRecorder!.stop()

使用展开的常量

recorder.stop()

无法停止audioRecorder

1 个答案: