Swift 如何使SCN视图小于屏幕大小？

视图控制器

import UIKit
import SceneKit

class ViewController: UIViewController {

    override func viewDidLoad() {
        super.viewDidLoad()

        let scnView = self.view as SCNView

        scnView.backgroundColor = UIColor.blackColor()

        let sizeScnView = CGSize(width: 100.0, height: 100.0)
        let centerView = CGPoint(x: CGRectGetMidX(self.view.frame) - sizeScnView.width/2, y: CGRectGetMidY(self.view.frame) - sizeScnView.height/2)
        let scene = Tile(frame: CGRect(origin: centerView, size: sizeScnView))
        scnView.scene = scene
    }
}

平铺

import UIKit
import SceneKit

class Tile: SCNScene {

    override init() {
        super.init()

        let ball = SCNSphere(radius: 0.5)
        let ballNode = SCNNode(geometry: ball)
        ball.firstMaterial?.diffuse.contents = UIColor.orangeColor()
        self.rootNode.addChildNode(ballNode)

    }

    required init(coder aDecoder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }
}

---

与任何其他

ui视图

一样，您可以设置

SCNView的
帧
（请参阅）

SCNScene
实例没有2D大小（您可以计算其根节点的边界框，但这有所不同）。
只是阅读本文，不知道问题是否仍然存在，我正在一个小测试中运行该测试，似乎效果不错

class ViewController: UIViewController {
   var sceneView: SCNView!
   var camera: SCNNode!
   var light: SCNNode!
   var sphere1: SCNNode!
   override func viewDidLoad() {
    super.viewDidLoad()
     let sizeScnView = CGSize(width: 420.0, height: 580.0)
     let centerView = CGPoint(x: CGRectGetMidX(self.view.frame) - sizeScnView.width/2, y: CGRectGetMidY(self.view.frame) - sizeScnView.height/2)
    sceneView = SCNView(frame: CGRect(origin: centerView, size: sizeScnView))
    sceneView.scene = SCNScene()
    self.view.addSubview(sceneView)
    sceneView.backgroundColor = UIColor.blackColor()
    let camera = SCNCamera()
    camera.zFar = 10000
    self.camera = SCNNode()
    self.camera.camera = camera
    self.camera.position = SCNVector3(x: -20, y: 55, z: 20)
    let constraint = SCNLookAtConstraint(target: ground)
    constraint.gimbalLockEnabled = true
    self.camera.constraints = [constraint]

    let ambientLight = SCNLight()
    ambientLight.color = UIColor.darkGrayColor()
    ambientLight.type = SCNLightTypeAmbient
    self.camera.light = ambientLight

    let spotLight = SCNLight()
    spotLight.type = SCNLightTypeSpot
    spotLight.castsShadow = true
    spotLight.spotInnerAngle = 70.0
    spotLight.spotOuterAngle = 90.0
    spotLight.zFar = 500
    light = SCNNode()
    light.light = spotLight
    light.position = SCNVector3(x: 0, y: 25, z: 25)
    light.constraints = [constraint]

    let sphereGeometry = SCNSphere(radius: 1.5)
    let sphereMaterial = SCNMaterial()
    sphereMaterial.diffuse.contents = UIColor.greenColor()
    sphereGeometry.materials = [sphereMaterial]
    sphere1 = SCNNode(geometry: sphereGeometry)
    sphere1.position = SCNVector3(x: -15, y: 1.5, z: 0)

   sceneView.scene?.rootNode.addChildNode(self.camera)
   sceneView.scene?.rootNode.addChildNode(light)
   sceneView.scene?.rootNode.addChildNode(sphere1)


   }
}

描述当前代码中哪些地方不起作用，以及希望得到什么不同的结果。（有些行看起来不像代码，但应该是代码，是否存在格式问题？）我在“let scene=”行上收到一条错误消息。错误消息：calllet scene=Tile（frame:CGRect（x:0，y:0，宽度：100，高度：100））中的额外参数“frame”//也不起作用
Tile
是
SCNScene
的子类。场景没有
frame
属性，也没有此类初始值设定项
SCNView
does.ground可以添加到根场景。不需要抱歉，没有删除这些行/////let constraint=SCNLookAtConstraint（目标：地面）/////constraint.gimballocked=true