如何在自定义UIView中将VideoPreviewLayer居中(序列图像板Swift)

class CustomView: UIView {
    override class var layerClass: AnyClass {
        return AVCaptureVideoPreviewLayer.self
    }
    
    var videoPreviewLayer: AVCaptureVideoPreviewLayer {
        return layer as! AVCaptureVideoPreviewLayer
    }
    
    override func layoutSubviews() {
        super.layoutSubviews()
        
        videoPreviewLayer.frame = bounds
    }
}

let customView = CustomView()
parentView.addSubview(customView)

// 使用约束布局
customView.translatesAutoresizingMaskIntoConstraints = false
NSLayoutConstraint.activate([
    customView.topAnchor.constraint(equalTo: parentView.topAnchor),
    customView.leadingAnchor.constraint(equalTo: parentView.leadingAnchor),
    customView.trailingAnchor.constraint(equalTo: parentView.trailingAnchor),
    customView.bottomAnchor.constraint(equalTo: parentView.bottomAnchor)
])

// 或者使用frame布局
customView.frame = parentView.bounds