所以，我正在尝试以编程方式创建一个 sceneView
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:
Terminating app due to uncaught exception 'NSGenericException', reason: 'Unable to activate constraint with anchors <NSLayoutYAxisAnchor:0x1c0278700 "ARSCNView:0x10690d7e0.top"> and <NSLayoutYAxisAnchor:0x1c426db40 "UIView:0x106b14e30.top"> because they have no common ancestor. Does the constraint or its anchors reference items in different view hierarchies? That's illegal.'
它发生在 \\add autolayout constraints 部分。如何向该元素添加约束？
最佳答案
dan is right ，你需要添加 sceneView 作为 subview 才能锚定它。尝试这样的事情:
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)
关于ios - 无法使用 anchor 激活约束，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/47168059/