I had tested the diffuse.contents property, attach a view to it, it work well many times, the ui touch gestures also work well , but the UIEditField can't get the focus, and the input method can't be ejected. And I need to handle the gestures of the SCNNode, rotations, scales, transforming, these are troubles! On android platform, in the SceneForm (ARKit ) scene , it use ViewRenderable to load a view.xml, it had same problems with ARKit.

Thanks  arthurfromberlin. My UIView is animated, and is a interactive view, maybe contain a web, a table, a list, some buttons, and so on. In ARKit+SceneKit project, i see someone loading view in the SCNMaterial.diffuse.contents, it work well, as following: private func show(viewController: BillboardViewController) {         let material = SCNMaterial()         material.isDoubleSided = true         material.cullMode = .front         material.diffuse.contents = viewController.view         billboard?.viewController = viewController         billboard?.billboardNode?.geometry?.materials = [material]     } But, if i use RealityKit to build a AR scene, it can't use SCNNode and SCNMaterial to create a entity, so , i don't know how to show my UIView in the AR scene. I read the document of the DrawableQueue carefully, but i don't think it can achieve the functions I need, it lack the ui events loop.