ios - 使用 Scenekit 场景时间来擦洗动画 iOS
<p><p>我正在尝试修改 Xcode 的默认游戏设置，以便我可以:将动画编程到几何体中，浏览该动画，并让用户自动播放动画。</p>
<p>我设法通过根据擦洗器的值设置 View 的场景时间来使动画擦洗工作。但是，当我将 SCNSceneRenderer 上的 isPlayingbool 值设置为 true 时，它会将每一帧的时间重置为 0，我无法让它离开第一帧。</p>
<p>从文档中，我假设这意味着它不会检测到我的动画，并认为所有动画的持续时间都是 0。</p>
<p>这是我的 GameViewController 中的 viewDidLoad 函数:</p>
<pre><code>override func viewDidLoad() {
super.viewDidLoad()
// create a new scene
let scene = SCNScene(named: "art.scnassets/ship.scn")!
// create and add a camera to the scene
let cameraNode = SCNNode()
cameraNode.camera = SCNCamera()
scene.rootNode.addChildNode(cameraNode)
// place the camera
cameraNode.position = SCNVector3(x: 0, y: 0, z: 15)
// create and add a light to the scene
let lightNode = SCNNode()
lightNode.light = SCNLight()
lightNode.light!.type = .omni
lightNode.position = SCNVector3(x: 0, y: 10, z: 10)
scene.rootNode.addChildNode(lightNode)
// create and add an ambient light to the scene
let ambientLightNode = SCNNode()
ambientLightNode.light = SCNLight()
ambientLightNode.light!.type = .ambient
ambientLightNode.light!.color = UIColor.darkGray
scene.rootNode.addChildNode(ambientLightNode)
// retrieve the ship node
let ship = scene.rootNode.childNode(withName: "ship", recursively: true)!
// define the animation
//ship.runAction(SCNAction.repeatForever(SCNAction.rotateBy(x: 0, y: 2, z: 0, duration: 1)))
let positionAnimation = CAKeyframeAnimation(keyPath: "position.y")
positionAnimation.values =
positionAnimation.keyTimes =
positionAnimation.duration = 5
positionAnimation.usesSceneTimeBase = true
// retrieve the SCNView
let scnView = self.view as! SCNView
scnView.delegate = self
// add the animation
ship.addAnimation(positionAnimation, forKey: "position.y")
// set the scene to the view
scnView.scene = scene
// allows the user to manipulate the camera
scnView.allowsCameraControl = true
// show statistics such as fps and timing information
scnView.showsStatistics = true
// configure the view
scnView.backgroundColor = UIColor.black
// add a tap gesture recognizer
let tapGesture = UITapGestureRecognizer(target: self, action: #selector(handleTap(_:)))
scnView.addGestureRecognizer(tapGesture)
// play the scene
scnView.isPlaying = true
//scnView.loops = true
}
</code></pre>
<p>感谢任何帮助! :)</p>
<p>引用资料:</p>
<p>场景时间:</p>
<p> <a href="https://developer.apple.com/documentation/scenekit/scnscenerenderer/1522680-scenetime" rel="noreferrer noopener nofollow">https://developer.apple.com/documentation/scenekit/scnscenerenderer/1522680-scenetime</a> </p>
<p>正在播放:</p>
<p> <a href="https://developer.apple.com/documentation/scenekit/scnscenerenderer/1523401-isplaying" rel="noreferrer noopener nofollow">https://developer.apple.com/documentation/scenekit/scnscenerenderer/1523401-isplaying</a> </p>
<p>相关问题:</p>
<p> <a href="https://stackoverflow.com/questions/35390959/scenekit-scnscenerendererdelegate-renderer-function-not-called" rel="noreferrer noopener nofollow">SceneKit SCNSceneRendererDelegate - renderer function not called</a> </p></p>
<br><hr><h1><strong>Best Answer-推荐答案</ strong></h1><br>
<p><p>我无法让它以一种优雅的方式工作，但我通过添加这个 Timer 调用来修复它:</p>
<pre><code>Timer.scheduledTimer(timeInterval: timeIncrement, target: self, selector: (#selector(updateTimer)), userInfo: nil, repeats: true)
</code></pre>
<p>timeIncrement 是一个 Double 设置为 0.01，updateTimer 是如下函数:</p>
<pre><code>// helper function updateTimer
@objc func updateTimer() {
let scnView = self.view.subviews as! SCNView
scnView.sceneTime += Double(timeIncrement)
}
</code></pre>
<p>我确信有更好的解决方案，但这可行。</p></p>
<p style="font-size: 20px;">关于ios - 使用 Scenekit 场景时间来擦洗动画 iOS，我们在Stack Overflow上找到一个类似的问题：
<a href="https://stackoverflow.com/questions/50650615/" rel="noreferrer noopener nofollow" style="color: red;">
https://stackoverflow.com/questions/50650615/
</a>
</p>
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