swift - 如何添加 30 秒计时器来结束游戏回合？

Question

我目前正在试验一些我在互联网上找到的关于游戏的代码，在该游戏中，您必须单击一组项目并避免单击另一组。我目前正在尝试在游戏中添加一个计时器，使其总共持续 30 秒，但我真的很难做到这一点，因为我对这种编程语言非常缺乏经验。

import UIKit
import QuartzCore
import SceneKit

class GameViewController: UIViewController, SCNSceneRendererDelegate {

    var gameView:SCNView!
    var SceneGame:SCNScene!
    var NodeCamera:SCNNode!
    var targetCreationTime:TimeInterval = 0


    override func viewDidLoad() {
        super.viewDidLoad()

        View_in()
        initScene()
        initCamera()
    }

    func View_in(){
        gameView = self.view as! SCNView
        gameView.allowsCameraControl = true
        gameView.autoenablesDefaultLighting = true

        gameView.delegate = self
    }

    func initScene (){
        SceneGame = SCNScene()
        gameView.scene = SceneGame

        gameView.isPlaying = true

    }

    func initCamera(){
        NodeCamera = SCNNode()
        NodeCamera.camera = SCNCamera()

        NodeCamera.position = SCNVector3(x:0, y:5, z:10)

        SceneGame.rootNode.addChildNode(NodeCamera)
    }

    func createTarget(){

        let geometry:SCNGeometry = SCNPyramid( width: 1, height: 1, length: 1)

        let randomColor = arc4random_uniform(2
            ) == 0 ? UIColor.green : UIColor.red

        geometry.materials.first?.diffuse.contents = randomColor

        let geometryNode = SCNNode(geometry: geometry)
        geometryNode.physicsBody = SCNPhysicsBody(type: .dynamic, shape: nil)


        if randomColor == UIColor.red {
            geometryNode.name = "enemy"
        }else{
            geometryNode.name = "friend"
        }


        SceneGame.rootNode.addChildNode(geometryNode)


        let randomDirection:Float = arc4random_uniform(2) == 0 ? -1.0 : 1.0

        let force = SCNVector3(x: randomDirection, y: 15, z: 0)

        geometryNode.physicsBody?.applyForce(force, at: SCNVector3(x: 0.05, y: 0.05, z: 0.05), asImpulse: true)
    }

    func renderer(_ renderer: SCNSceneRenderer, updateAtTime time: TimeInterval) {
        if time > targetCreationTime{
            createTarget()
            targetCreationTime = time + 0.6
        }

        cleanUp()
    }

    override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
        let touch = touches.first!

        let location = touch.location(in: gameView)

        let hitList = gameView.hitTest(location, options: nil)

        if let hitObject = hitList.first{
            let node = hitObject.node

            if node.name == "friend" {
                node.removeFromParentNode()
                self.gameView.backgroundColor = UIColor.black
            }else {
                node.removeFromParentNode()
                self.gameView.backgroundColor = UIColor.red
            }
        }
    }

    func cleanUp() {
        for node in SceneGame.rootNode.childNodes {
            if node.presentation.position.y < -2 {
                node.removeFromParentNode()
            }
        }
    }

    override var shouldAutorotate: Bool {
        return true
    }

    override var prefersStatusBarHidden: Bool {
        return true
    }

    override var supportedInterfaceOrientations: UIInterfaceOrientationMask {
        if UIDevice.current.userInterfaceIdiom == .phone {
            return .allButUpsideDown
        } else {
            return .all
        }
    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Release any cached data, images, etc that aren't in use.
    }

}

标签： swiftscenekit

Answer 1

编辑

创建一个变量，表示您希望游戏结束的时间：

    var time: CGFloat = 60

然后，将 SCNAction 添加到您的场景中，以便每秒减少此变量值，例如在viewDidLoad：

    //One second before decrease the time
    let wait = SCNAction.wait(forDuration: 1)

    //This is the heart of this answer
   // An action that reduce the time and when it is less than 1 (it reached zero) do whatever you want

    let reduceTime = SCNAction.run{ _ in
        self.time -= 1
        if self.time < 1 {
    // Do whatever you want
    // for example show a game over scene or something else
            }
        }
    }

    SceneGame.rootNode.run(SCNAction.repeatForever(SCNAction.sequence([wait,reduceTime])))

如果需要，您可以SKLabel在 HUD 上使用来显示剩余时间，该 HUDSKScene用作叠加层。

您可以查看本教程以了解如何创建 HUD

同样，您可以使用SCNText，这是有关它的文档