如果你只是问如何添加ARSCN视图，那么我的回答是：

//instantiate scene view in viewDidLoad
sceneView = ARSCNView()

//add it to parents subview
self.view.addSubview(sceneView)

//add autolayout contstraints
sceneView.translatesAutoresizingMaskIntoConstraints = false
sceneView.topAnchor.constraint(equalTo: self.view.topAnchor).isActive = true
sceneView.leftAnchor.constraint(equalTo: self.view.leftAnchor).isActive = true
sceneView.rightAnchor.constraint(equalTo: self.view.rightAnchor).isActive = true
sceneView.bottomAnchor.constraint(equalTo: self.view.bottomAnchor).isActive = true

//load your scene

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你的代码可能就这么简单：

import ARKit

class ViewController: UIViewController, ARSCNViewDelegate {

    lazy var sceneView: ARSCNView = {
        let sceneView = ARSCNView()
        sceneView.delegate = self
        return sceneView
    }()

    override func viewDidLoad() {
        super.viewDidLoad()
        self.view.addSubview(sceneView)
    
        NSLayoutConstraint.activate([
            sceneView.topAnchor.constraint(equalTo: view.topAnchor),
            sceneView.leadingAnchor.constraint(equalTo: view.leadingAnchor),
            sceneView.bottomAnchor.constraint(equalTo: view.bottomAnchor),
            sceneView.trailingAnchor.constraint(equalTo: view.trailingAnchor)
        ])
        view.subviews.forEach {
            $0.translatesAutoresizingMaskIntoConstraints = false
        }
    }
}

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