[英]Unable to activate constraint with anchors
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:04x306 nocommonancestorage" . 约束或其锚点是否引用了不同视图层次结构中的项? 那是非法的。
它发生在\\\\add autolayout contstraints
部分。 如何向该元素添加约束?
dan 是对的,您需要将sceneView
添加为子视图,然后才能锚定它。 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)
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