在Swift 2.0中，layerWithSession不可用？

Question

您好我有AVCaptureVideoPreviewLayer

的问题

let previewLayer: AVCaptureVideoPreviewLayer = AVCaptureVideoPreviewLayer.layerWithSession(captureSession) as AVCaptureVideoPreviewLayer
    previewLayer.frame = UIScreen.mainScreen().bounds
    previewLayer.videoGravity = AVLayerVideoGravityResizeAspectFill
    visageCameraView.layer.addSublayer(previewLayer)

  

'layerWithSession'不可用：使用对象构造'AVCaptureVideoPreviewLayer（session：）'

Answer 1

正如错误消息所示，您必须

let previewLayer = AVCaptureVideoPreviewLayer(session: captureSession)