如何在Swift Playgrounds中传递同一变量的多个绑定值？

Question

我正在尝试在快速的操场上做一个简单的游戏。我在SwiftUI视图中有两个（某种）按钮，在它们下面有一个SCNView。在这种情况下，我有一个SCNCylinder。这两个按钮是“ 90度”和“ 180度”。我只希望圆柱体围绕用户在圆柱体当前位置上选择的角度绕不同的轴旋转。在我的代码中，我使用了两个布尔变量，当分别点击相应的按钮时，它们会返回true或false。但是，当我按下任何一个按钮时，我的操场就崩溃了。 （请为我提供较长的变量名。）

我的代码是：

import UIKit
import SwiftUI
import SceneKit
import Combine


struct ContentView: View {

@State var button180DegreesIsTapped: Bool = false
@State var button90DegreesIsTapped: Bool = false

var body: some View {

    VStack{
        HStack{
        Text("180 degrees").onTapGesture {
            self.button90DegreesIsTapped = false
            self.button180DegreesIsTapped = true
        }

        Text("90 degrees").onTapGesture {
            self.button90DegreesIsTapped = true
            self.button180DegreesIsTapped = false
            }

        }

        SceneKitView(radius: 0.02, height: 2, is180DegreeTapped: $button180DegreesIsTapped, is90DegreeTapped: $button180DegreesIsTapped)
            .position(x: 200.0, y: 140)
            .frame(width: 300, height: 300, alignment: .center)
        }

    }

}

 struct SceneKitView: UIViewRepresentable {
   @Binding var is180DegreeTapped : Bool
   @Binding var is90DegreeTapped: Bool

let cylindernode: SCNNode

init(radius: CGFloat, height: CGFloat, is180DegreeTapped : Binding<Bool>, is90DegreeTapped: Binding<Bool>) {

    let cylinder = SCNCylinder(radius: radius, height: height)
    cylinder.firstMaterial?.diffuse.contents = UIColor.green
    self.cylindernode = SCNNode(geometry: cylinder)
    self.cylindernode.position = SCNVector3(0, 0, 0)
    self.cylindernode.orientation = SCNVector4(0, 0, 0, 0)
    cylindernode.pivot = SCNMatrix4MakeTranslation(0, -1, 0)

    self._is180DegreeTapped = is180DegreeTapped
    self._is90DegreeTapped = is90DegreeTapped

}

func makeUIView(context: UIViewRepresentableContext<SceneKitView>) -> SCNView {

    let sceneView = SCNView()
    sceneView.scene = SCNScene()
    sceneView.autoenablesDefaultLighting = true
    sceneView.allowsCameraControl = true
    sceneView.scene?.rootNode.addChildNode(cylindernode)
    return sceneView

}

func updateUIView(_ sceneView: SCNView, context: UIViewRepresentableContext<SceneKitView>) {

    if is90DegreeTapped == true && is180DegreeTapped == false{

       let rotate = CABasicAnimation(keyPath: "transform.rotation")
        rotate.duration = 5
        rotate.isRemovedOnCompletion = true
        cylindernode.addAnimation(rotate, forKey: "rotate")
        cylindernode.rotate(by: SCNVector4(x: 0, y: 0, z: 0.7071, w: 0.7071), aroundTarget: SCNVector3(0, 0, 1))

        cylindernode.position = SCNVector3(0, 0, 0)

    }

    if is180DegreeTapped == true && is90DegreeTapped == false{

        let rotate = CABasicAnimation(keyPath: "transform.rotation")
                   rotate.duration = 5
                   rotate.isRemovedOnCompletion = true
                   cylindernode.addAnimation(rotate, forKey: "rotate")
                   cylindernode.rotate(by: SCNVector4(x: 1, y: 0, z: 0, w: 0), aroundTarget: SCNVector3(1, 0, 0))

                   cylindernode.position = SCNVector3(0, 0, 0)
    }
  }
}


let host = UIHostingController(rootView: ContentView())

如果我删除行self.button90DegreesIsTapped = false和self.button180DegreesIsTapped = false，代码将运行，但是显然不能达到预期的结果。如果是错误，请告诉我是否还有其他解决方法。请帮我解决这个问题。