swift - 如何使 scnView 小于屏幕尺寸？

Question

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
    }
}

瓦

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")
    }
}

Answer 1

就像任何其他UIView你可以设置的frame一样SCNView（请参阅查看 iOS 编程指南）。

SCNScene实例没有 2D 大小（您可以计算其根节点的边界框，但有所不同）。

Answer 2

只是阅读这篇文章不知道问题是否仍然打开我在一个小测试中运行这个似乎工作正常

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)


   }
}