swift - Swift 3-AVCapture自定义相机 View

我一直在观看此视频，以制作自定义相机 View 。
https://www.youtube.com/watch?v=w0O3ZGUS3pk

但是由于iOS 10和Swift 3的变化，许多事情不再相关了

以下是我将不赞成使用的功能更改为新功能后得到的代码。.但是没有错误，但也没有在UIView上看到预览

import UIKit
import AVFoundation

class ViewController: UIViewController, AVCapturePhotoCaptureDelegate, UIImagePickerControllerDelegate, UINavigationControllerDelegate {
    @IBOutlet weak var cameraView: UIView!
    var captureSession = AVCaptureSession();
    var sessionOutput = AVCapturePhotoOutput();
    var sessionOutputSetting = AVCapturePhotoSettings(format: [AVVideoCodecKey:AVVideoCodecJPEG]);
    var previewLayer = AVCaptureVideoPreviewLayer();

    override func viewWillAppear(_ animated: Bool) {
        let deviceDiscoverySession = AVCaptureDeviceDiscoverySession(deviceTypes: [AVCaptureDeviceType.builtInDuoCamera, AVCaptureDeviceType.builtInTelephotoCamera,AVCaptureDeviceType.builtInWideAngleCamera], mediaType: AVMediaTypeVideo, position: AVCaptureDevicePosition.unspecified)
        for device in (deviceDiscoverySession?.devices)! {
            if(device.position == AVCaptureDevicePosition.front){
                do{
                    let input = try AVCaptureDeviceInput(device: device)
                    if(captureSession.canAddInput(input)){
                        captureSession.addInput(input);

                        if(captureSession.canAddOutput(sessionOutput)){
                            captureSession.addOutput(sessionOutput);
                            previewLayer = AVCaptureVideoPreviewLayer(session: captureSession);
                            previewLayer.videoGravity = AVLayerVideoGravityResizeAspectFill;
                            previewLayer.connection.videoOrientation = AVCaptureVideoOrientation.portrait;
                            cameraView.layer.addSublayer(previewLayer);
                        }
                    }
                }
                catch{
                    print("exception!");
                }
            }
        }
    }

最佳答案

您忘记了开始 session :

captureSession.startRunning()

并为previewLayer设置框架:

override func viewDidLayoutSubviews() {
    super.viewDidLayoutSubviews()
    previewLayer.frame = cameraView.bounds
}

ps。一旦添加了 session 输入和输出，就应该摆脱这种循环。