36

所以，我正在尝试以编程方式创建一个场景视图

class ViewController: UIViewController, ARSCNViewDelegate {
    var sceneView: ARSCNView = ARSCNView()
    let configuration = ARWorldTrackingConfiguration()
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        self.sceneView.debugOptions = [ARSCNDebugOptions.showFeaturePoints, ARSCNDebugOptions.showWorldOrigin]
        self.configuration.planeDetection = .horizontal
        self.sceneView.session.run(configuration)
        self.sceneView.delegate = self
        self.sceneView.autoenablesDefaultLighting = true
        
        //add autolayout contstraints
        self.sceneView.translatesAutoresizingMaskIntoConstraints = false
        self.sceneView.topAnchor.constraint(equalTo: self.view.topAnchor).isActive = true
        self.sceneView.leftAnchor.constraint(equalTo: self.view.leftAnchor).isActive = true
        self.sceneView.rightAnchor.constraint(equalTo: self.view.rightAnchor).isActive = true
        self.sceneView.bottomAnchor.constraint(equalTo: self.view.bottomAnchor).isActive = true

    }
    
    func renderer(_ renderer: SCNSceneRenderer, didAdd node: SCNNode, for anchor: ARAnchor) {
        guard anchor is ARPlaneAnchor else {return}
    }
}

但我收到此错误消息：

由于未捕获的异常“NSGenericException”而终止应用程序，原因：“无法使用锚点激活约束 <NSLayoutYAxisAnchor:0x1c0278700 "ARSCNView:0x10690d7e0.top"> 和 <NSLayoutYAxisAnchor:0x1c426db40 "UIView:0x106b14e30.top"> 因为它们没有共同的祖先. 约束或其锚点是否引用不同视图层次结构中的项目？这是非法的。

它发生在部分\\add autolayout contstraints。如何向该元素添加约束？

4

1 回答 1

87

dan is right, you need to add sceneView as a subview before you can anchor it. Try something like this:

view.addSubview(sceneView)
sceneView.anchor(top: self.view.topAnchor, left: self.view.leftAnchor, bottom: self.view.bottomAnchor, right: self.view.rightAnchor, paddingTop: 0, paddingLeft: 0, paddingBottom: 0, paddingRight: 0, width: 0, height: 0)
于 2017-11-08T02:28:32.123 回答