inheritance - SceneKit Swift 3 继承不起作用

Question

我写了一个类:

import UIKit
import SceneKit

class Scene: SCNScene {

var _sceneView: SCNView!
var cameraNode: SCNNode!

func setupView(view: SCNView) {

    _sceneView = view

   }
}

但是当我在 GameViewController 中调用该类的函数时:

import UIKit
import QuartzCore
import SceneKit
import SpriteKit

class GameViewController: UIViewController, SCNSceneRendererDelegate {

var scene: Scene?                       = nil

override func viewDidLoad() {

super.viewDidLoad()

    //Super
    super.viewDidLoad()

    scene = Scene()

    let sceneView = self.view as! SCNView

    ...

    sceneView.scene = scene?.setupView(view: sceneView)
  }
}

它显示错误:

无法分配“()”类型的值？输入“SCNScene？”

当我试图调用函数时，它被划掉了函数:



请解释并帮助解决该问题。

提前致谢。

Answer 1

忽略其他潜在问题(除非绝对需要，否则不要强制解包( ! )，下划线变量名是objective-c ivars的约定，有时用于命名swift类的私有(private)存储)，你可能想要的是类似于:

//: Playground - noun: a place where people can play

import UIKit
import SceneKit
import QuartzCore
import SpriteKit

class Scene: SCNScene {

    var _sceneView: SCNView!
    var cameraNode: SCNNode!

    func setupView(view: SCNView) {

        _sceneView = view

    }
}

class GameViewController: UIViewController, SCNSceneRendererDelegate {

    var scene: Scene? = nil

    override func viewDidLoad() {
        super.viewDidLoad()

        let scene = Scene()

        let sceneView = self.view as! SCNView
        scene.setupView(view: sceneView)
        sceneView.scene = scene

        self.scene = scene
    }
}