如何使用情节提要停止当前模态转场的 ARView 会话？

Question

我有两个包含 ARView 的 ViewController。代码如下：

import UIKit
import RealityKit
import ARKit

class fvBoat: UIViewController, ARSessionDelegate {
    
    @IBOutlet var arView: ARView!
    
        let fvBoatAnchor = try! Vard.loadFvBoatScene()
            var imageAnchorToEntity: [ARImageAnchor: AnchorEntity] = [:]
    
           
        override func viewDidLoad() {
                super.viewDidLoad()
            fvBoatAnchor.generateCollisionShapes(recursive: true)
            let fvBoat = fvBoatAnchor.fvBoatObject as? Entity & HasCollision
                arView.installGestures(for: fvBoat!)
                arView.scene.addAnchor(fvBoatAnchor)
                arView.session.delegate = self
        }
           
            func session(_ session: ARSession, didAdd anchors: [ARAnchor]) {
                anchors.compactMap { [=10=] as? ARImageAnchor }.forEach {
                    let anchorEntity = AnchorEntity()
                    let modelEntity = fvBoatAnchor.fvBoatObject!
                    anchorEntity.addChild(modelEntity)
                    arView.scene.addAnchor(anchorEntity)
                    anchorEntity.transform.matrix = [=10=].transform
                    imageAnchorToEntity[[=10=]] = anchorEntity
                }
            }

            func session(_ session: ARSession, didUpdate anchors: [ARAnchor]) {
                anchors.compactMap { [=10=] as? ARImageAnchor }.forEach {
                    let anchorEntity = imageAnchorToEntity[[=10=]]
                    anchorEntity?.transform.matrix = [=10=].transform
                }
            }
            func installGestures(on object:ModelEntity){
                
                object.generateCollisionShapes(recursive: true)
                arView.installGestures([.rotation,.scale], for: object)
            }
    }

两个视图控制器的代码与上面相同。

每当我使用 Present Modally segue 导航到下一个 ARview 时，我的帧率都会显着下降。当我转到下一个 ARview 时，如何确保 ARview 会话关闭？

Storyboard view of the ViewController

也试过添加这个功能，但不知道为什么不行...

func leaveScene() {

        arView?.session.pause()
        arView?.removeFromSuperview()
        arView = nil

    }

Answer 1

您没有关闭所有需要关闭的东西。

func leaveScene() {

    arView?.session.pause()
    arView?.session.delegate = nil
    arView?.scene.anchors.removeAll()
    arView?.removeFromSuperview()
    arView?.window?.resignKey()
    arView = nil
}

P.S。但是 arView 不会从内存中释放。

Answer 2

这帮我解决了。使用来自@Andy 的代码，我添加了 leaveScene 函数并将其称为使用来自 UIbutton 的发送事件：

@IBAction func leaveScene(_ sender: UIbutton) {
        leaveScene()
    }

这让我的代码看起来像这样。


import UIKit
import RealityKit
import ARKit

class fvBridge: UIViewController, ARSessionDelegate {
    
    @IBOutlet var arView: ARView!
    
        let fvBridgeAnchor = try! Experience.loadFvBridgeScene()
            var imageAnchorToEntity: [ARImageAnchor: AnchorEntity] = [:]
    
           
        override func viewDidLoad() {
                super.viewDidLoad()
            fvBridgeAnchor.generateCollisionShapes(recursive: true)
            let fvBridge = fvBridgeAnchor.fvBridgeObject as? Entity & HasCollision
                arView.installGestures(for: fvBridge!)
                arView.scene.addAnchor(fvBridgeAnchor)
                arView.session.delegate = self
        }
           
            func session(_ session: ARSession, didAdd anchors: [ARAnchor]) {
                anchors.compactMap { [=11=] as? ARImageAnchor }.forEach {
                    let anchorEntity = AnchorEntity()
                    let modelEntity = fvBridgeAnchor.fvBridgeObject!
                    anchorEntity.addChild(modelEntity)
                    arView.scene.addAnchor(anchorEntity)
                    anchorEntity.transform.matrix = [=11=].transform
                    imageAnchorToEntity[[=11=]] = anchorEntity
                }
            }

            func session(_ session: ARSession, didUpdate anchors: [ARAnchor]) {
                anchors.compactMap { [=11=] as? ARImageAnchor }.forEach {
                    let anchorEntity = imageAnchorToEntity[[=11=]]
                    anchorEntity?.transform.matrix = [=11=].transform
                }
            }
            func installGestures(on object:ModelEntity){
                
                object.generateCollisionShapes(recursive: true)
                arView.installGestures([.rotation,.scale], for: object)
            }
    func leaveScene() {

        arView?.session.pause()
        arView?.session.delegate = nil
        arView?.scene.anchors.removeAll()
        arView?.removeFromSuperview()
        arView?.window?.resignKey()
        arView = nil
    }
    
    @IBAction func leaveScene(_ sender: Any) {
        leaveScene()
    }
}

如何使用情节提要停止当前模态转场的 ARView 会话？

How do I stop ARView session on present modally segue using storyboard?

storyboard

swift

arkit

realitykit