Question

我目前正在尝试一些我在互联网上找到的有关游戏的代码，在该游戏中，您必须单击一组项目，而避免单击另一组。我目前正在尝试向游戏中添加一个计时器，以使其总共持续30秒，但是我确实很努力，因为我对这种编程语言没有足够的经验。

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.
    }

}

Answer 1

您可以使用here中记录的Timer对象。只需在希望游戏开始时设置计时器，大概在完成所有初始化后即可。设置计时器后，只需等待计时器结束时回调代码并运行您想用来终止游戏的任何逻辑即可。

Answer 2

EDIT

创建一个代表您希望游戏结束的时间的变量：

    var time: CGFloat = 60

然后，将SCNAction添加到您的场景中，以使其每秒都会减小此变量值，例如在viewDidLoad中：

    //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，您可以通过在HUD上使用SKLabel来显示剩余时间，HUD是用作重叠的SKScene。

您可以check this tutorial了解如何创建HUD

同样，您可以使用SCNText，这就是documentation about it

如何添加30秒计时器结束游戏回合？

2 个答案: