ios - AVFoundation videoZoomFactor 不工作(Swift)

Question

除缩放系数外，我想使用的所有相机调整都有效。我不知道为什么会这样……有什么想法吗？自定义曝​​光和焦点设置工作正常。 iOS 中是否发生了一些我不知道的变化？

captureSession = AVCaptureSession()
    captureSession?.sessionPreset = AVCaptureSessionPresetPhoto
    stillImageOutput = AVCapturePhotoOutput()

    let device = AVCaptureDevice.defaultDevice(withMediaType: AVMediaTypeVideo)

    do{
        do{
            try device?.lockForConfiguration()
            device?.setFocusModeLockedWithLensPosition(focusValue, completionHandler: {(time) -> Void in})
            device?.setExposureModeCustomWithDuration(CMTimeMake(1, exposureValue), iso: ISOValue, completionHandler: {(time) -> Void in})
            let zoomFactor:CGFloat = 16
            device?.videoZoomFactor = zoomFactor
            device?.unlockForConfiguration()

        }catch{
            print(error)
        }

        stillImageOutput.isHighResolutionCaptureEnabled = true
        let input = try AVCaptureDeviceInput(device: device)
        if(captureSession.canAddInput(input)){
            captureSession.addInput(input)
            if(captureSession.canAddOutput(stillImageOutput)){
                captureSession.addOutput(stillImageOutput)

                captureSession.startRunning()
                let captureVideoLayer: AVCaptureVideoPreviewLayer = AVCaptureVideoPreviewLayer.init(session: captureSession)
                captureVideoLayer.frame = self.previewView.bounds
                captureVideoLayer.videoGravity = AVLayerVideoGravityResizeAspectFill
                self.previewView.layer.insertSublayer(captureVideoLayer, at: 0)
            }
        }
    }catch{
        print(error)
    }

Answer 1

原来我只是在错误的位置设置了我的设备设置。如果将 lockconfig try block 移动到捕获 session 内容下方，它将按预期工作。