Swift AVFoundation相机关闭打开按钮动作错误

Question

我有工作条码扫描器代码，它有自动打开相机与viewDidAppear我想改变它按钮操作打开和关闭我尝试但我不解决它我的代码在下面。 （我还添加了closeCamera和openCamera动作）感谢您的帮助。

    @IBOutlet weak var cameraView: DesignableView!
    override func viewDidAppear(animated: Bool){
        super.viewDidAppear(animated)
        self.setupCaptureSession()
    }

    //MARK: Session Startup
    private func setupCaptureSession(){
        self.captureDevice = AVCaptureDevice.defaultDeviceWithMediaType(AVMediaTypeVideo)

        do {
            let deviceInput = try AVCaptureDeviceInput(device: captureDevice) as AVCaptureDeviceInput

            //Add the input feed to the session and start it
            self.captureSession.addInput(deviceInput)
            self.setupPreviewLayer({
            self.captureSession.startRunning()
            self.addMetaDataCaptureOutToSession()
            })
        } catch let setupError as NSError {
            self.showError(setupError.localizedDescription)
        }
    }

    private func setupPreviewLayer(completion:() -> ()){

        self.captureLayer = AVCaptureVideoPreviewLayer(session: captureSession) as AVCaptureVideoPreviewLayer

        if let capLayer = self.captureLayer {
            capLayer.videoGravity = AVLayerVideoGravityResizeAspectFill
            capLayer.frame = self.cameraView.frame
            self.view.layer.addSublayer(capLayer)
            completion()
        }
        else {
            self.showError("An error occured beginning video capture.")
        }
    }

    //MARK: Metadata capture
    func addMetaDataCaptureOutToSession() {
        let metadata = AVCaptureMetadataOutput()
        self.captureSession.addOutput(metadata)
        metadata.metadataObjectTypes = metadata.availableMetadataObjectTypes
        metadata.setMetadataObjectsDelegate(self, queue: dispatch_get_main_queue())
    }

    //MARK: Delegate Methods
    func captureOutput(captureOutput: AVCaptureOutput!, didOutputMetadataObjects metadataObjects: [AnyObject]!, fromConnection connection: AVCaptureConnection!) {

        for metaData in metadataObjects {
            let decodedData:AVMetadataMachineReadableCodeObject = metaData as! AVMetadataMachineReadableCodeObject
             self.pCodeTextField.text = decodedData.stringValue

            //decodedData.type
        }
    }

    //MARK: Utility Functions
    func showError(error:String) {
        let alertController = UIAlertController(title: "Error", message: error, preferredStyle: .Alert)
        let dismiss:UIAlertAction = UIAlertAction(title: "OK", style: UIAlertActionStyle.Destructive, handler:{(alert:UIAlertAction) in
            alertController.dismissViewControllerAnimated(true, completion: nil)
        })
        alertController.addAction(dismiss)
        self.presentViewController(alertController, animated: true, completion: nil)
    }

 @IBAction func closeCamera(sender: AnyObject) {


      // HERE I WANT CLOSE CAMERA WHEN CLICKED

    }
    @IBAction func openCamera(sender: AnyObject) {


       // HERE I WANT OPEN CAMERA WHEN CLICKED
    }

谢谢。