我正在尝试基于AVFoundation框架创建一个拍照应用程序。 我在屏幕上有一个预览层，它按我想要的那样填充整个屏幕。

这就是预览层所看到的内容:https://ibb.co/47gyqbd

这就是我捕获照片时得到的结果:https://ibb.co/qkkbf0n

下面是我如何创建预览层对象。

let previewLayer = AVCaptureVideoPreviewLayer(session: captureSession)
previewLayer.videoGravity = .resizeAspectFill
previewLayer.frame = view.bounds
let previewLayerContainer = UIView()
previewLayerContainer.frame = CGRect(x: 0, y: 0, width: view.bounds.size.width, height: view.bounds.size.height)
view.addSubview(previewLayerContainer)
previewLayer.bounds = previewLayerContainer.bounds
previewLayerContainer.layer.addSublayer(previewLayer)

照片设置:

// AVCapturePhotoSettings object
        let photoSettings: AVCapturePhotoSettings
        
        // Capture HEIF photos when supported
        if self.photoOutput.availablePhotoCodecTypes.contains(.hevc) {
            photoSettings = AVCapturePhotoSettings(format:
                [AVVideoCodecKey: AVVideoCodecType.hevc])
        } else {
            photoSettings = AVCapturePhotoSettings()
        }
        
        //Enable auto-flash and high-resolution photos
        if self.captureDeviceInput.device.isFlashAvailable {
            switch currentFlashStatus {
            case .AUTO:
                photoSettings.flashMode = .auto
            case .ON:
                photoSettings.flashMode = .on
            case .OFF:
                photoSettings.flashMode = .off
            }
        }
        
        photoSettings.isHighResolutionPhotoEnabled = true
        
        //Photo Quality Prioritization
        photoOutput.maxPhotoQualityPrioritization = .quality
        photoSettings.photoQualityPrioritization = .quality