错误访问物理场导致应用程序崩溃 SWIFT、XCODE

Question

嘿，我有一个 world/Scene，里面有一个人，所以我决定制作一个物理场来充当重力。所以我可以使用 swift 毫无问题地对其进行编码，但是后来我运行该应用程序并且它一直给我错误的访问权限。没有这些代码行，我的 app/scenekit 游戏可以顺利运行任何帮助。请查看所附图片谢谢

enter image description here

代码：

    // I declared field owner up at the top here
    class GameViewController: UIViewController, ADBannerViewDelegate, SKPhysicsContactDelegate, SKSceneDelegate, SCNSceneRendererDelegate, SCNPhysicsContactDelegate{

       var fieldOwner = SCNNode()

       override func viewDidLoad() {
          super.viewDidLoad()

         //Force field to act as Gravity 

         fieldOwner = SCNNode()
         fieldOwner.position = SCNVector3(x: 0, y: -5, z: -5)

         let field: SCNPhysicsField = SCNPhysicsField.radialGravityField()
         field.halfExtent = SCNVector3Make(100, 100, 100)
         field.minimumDistance = 20.0
         field.falloffExponent = 0

         self.fieldOwner.physicsField!.strength = 0.0
         self.fieldOwner.physicsField = field

         scnView.scene!.rootNode.addChildNode(fieldOwner)
     }
  }

Answer 1

看起来您在设置之前正在访问 self.fieldOwner.physicsField。尝试在本地 field 变量上设置强度：

改变

self.fieldOwner.physicsField!.strength = 0.0

到

field.strength = 0.0

错误访问物理场导致应用程序崩溃 SWIFT、XCODE

bad access physics field crashes application SWIFT, XCODE

exc-bad-access

ios

swift