在场景中放置对象，SpriteKit答案

【问题标题】：Place object in scene, SpriteKit在场景中放置对象，SpriteKit
【发布时间】：2014-08-27 20:56:36
【问题描述】：

文件GameScene有类GameScene，类GameScene有CirclePhysicsDefault：

func circlePhysicsDefault() {
var Circle = SKShapeNode(circleOfRadius: 40)
Circle.position = CGPointMake(500, 500)
Circle.name = "defaultCircle"
Circle.strokeColor = SKColor.blackColor()
Circle.glowWidth = 10.0
Circle.fillColor = SKColor.yellowColor()
Circle.physicsBody = SKPhysicsBody(circleOfRadius: 40)
Circle.physicsBody.dynamic = true
self.addChild(Circle)
}

在文件 GameViewController 我输入：

@IBAction func addOneCircle(sender: AnyObject) {
GameScene().circlePhysicsDefault()
}

我将此链接到按钮。

运行应用程序，按下按钮 - 没有任何反应。

如果在GameScene函数didMoveToView中我调用了函数circlePhysicsDefault，那么会放置应用启动圈。

文件 GameViewController：

import UIKit
import SpriteKit

class GameViewController: UIViewController {

override func viewDidLoad() {
super.viewDidLoad()

/* Pick a size for the scene */
let scene = GameScene(fileNamed:"GameScene")
// Configure the view.
let skView = self.view as SKView
skView.showsFPS = true
skView.showsNodeCount = true

/* Sprite Kit applies additional optimizations to improve rendering performance */
skView.ignoresSiblingOrder = true

/* Set the scale mode to scale to fit the window */
scene.scaleMode = .AspectFill

skView.presentScene(scene)
}

@IBAction func addOneCircle(sender: AnyObject) {
GameScene(fileNamed:"GameScene").circlePhysicsDefault()
}

override func shouldAutorotate() -> Bool {
return true
}

override func supportedInterfaceOrientations() -> Int {
if UIDevice.currentDevice().userInterfaceIdiom == .Phone {
return Int(UIInterfaceOrientationMask.AllButUpsideDown.toRaw())
} else {
return Int(UIInterfaceOrientationMask.All.toRaw())
}
}

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




override func prefersStatusBarHidden() -> Bool {
return false }
}

文件游戏场景：

import SpriteKit

class GameScene: SKScene {
    override func didMoveToView(view: SKView) {
        /* Setup your scene here */

        circlePhysicsDefault()
    }

    override func update(currentTime: CFTimeInterval) {
        /* Called before each frame is rendered */
    }

    func sceneSetting() {
        self.backgroundColor = SKColor.grayColor()
        self.physicsWorld.gravity = CGVectorMake(0.01, -2)
        }
    func circlePhysicsDefault() {
        var Circle = SKShapeNode(circleOfRadius: 40)
        Circle.position = CGPointMake(500, 500)
        Circle.name = "defaultCircle"
        Circle.strokeColor = SKColor.blackColor()
        Circle.glowWidth = 10.0
        Circle.fillColor = SKColor.yellowColor()
        Circle.physicsBody = SKPhysicsBody(circleOfRadius: 40)
        Circle.physicsBody.dynamic = true
        self.addChild(Circle)
    }
}

【问题讨论】：

标签： xcode swift

【解决方案1】：

您按下按钮的方法：

@IBAction func addOneCircle(sender: AnyObject) {
GameScene(fileNamed:"GameScene").circlePhysicsDefault()
}

不会对您之前创建的场景做任何事情。从另一个 GameScene 类对象调用的方法 circlePhysicsDefault()。这就是为什么你的场景中没有物体。要解决此问题，您可以存储指向您的场景对象的指针并使用它调用方法。

在这种情况下，您的 GameViewController 将如下所示：

class GameViewController: UIViewController {

    var myScene: GameScene?

    override func viewDidLoad() {
        super.viewDidLoad()

        let scene = GameScene(fileNamed:"GameScene")

        self.myScene = scene

        let skView = self.view as SKView
        skView.showsFPS = true
        skView.showsNodeCount = true
        skView.ignoresSiblingOrder = true
        scene.scaleMode = .AspectFill

        skView.presentScene(scene)
    }

    @IBAction func addOneCircle(sender: AnyObject) {
        if self.myScene != nil {
            self.myScene!.circlePhysicsDefault()
        }
    }
.......
.......
.......
}

【讨论】：