swift - 我的 Sprite 不执行我告诉它的操作？

Question

我正在使用 Swift 和 SpriteKit 在 Xcode 7 中制作一个应用程序。我的想法是拥有一艘随手指移动的宇宙飞船，或者基本上只是跟随它，但我遇到了麻烦。这是代码:

import Foundation
import SpriteKit

class secondScene: SKScene {

override func didMoveToView(view: SKView) {

   // var timer = NSTimer.scheduledTimerWithTimeInterval(0.2, target: self, selector: Selector(spawnBullets()), userInfo: nil, repeats: true)

    //buttons
    let leftbutton = SKSpriteNode(imageNamed: "LeftArrow")
    leftbutton.position = CGPoint(x: self.frame.size.width*0.2, y: self.frame.size.height*0.1)
    leftbutton.size = CGSize(width: 220, height: 80)
    leftbutton.color = SKColor.blueColor()
    leftbutton.zPosition = 100
    self.addChild(leftbutton)

    let rightbutton = SKSpriteNode(imageNamed: "RightArrow")
    rightbutton.position = CGPoint(x: self.frame.size.width*0.8, y: self.frame.size.height*0.1)
    rightbutton.size = CGSize(width: 220, height: 80)
    rightbutton.color = SKColor.blueColor()
    rightbutton.zPosition = 100
    self.addChild(rightbutton)

    //spaceship
    let spaceship = SKSpriteNode(imageNamed: "spaceship")
    spaceship.zPosition = 100
    spaceship.size = CGSize(width: 200, height: 120)
    spaceship.position = CGPoint(x: self.frame.size.width/2, y: self.frame.size.height*0.15)
    self.addChild(spaceship)           
}

let spaceship = SKSpriteNode(imageNamed: "spaceship")

override func touchesBegan(touches: Set<UITouch>, withEvent event: UIEvent?) {

    for touch: AnyObject in touches {
        let location = touch.locationInNode(self)
        spaceship.position.x = location.x
    }
}
}

我运行此程序，在我看来我的宇宙飞船似乎应该跟随我的手指，但事实并非如此。它只是停留在我之前指定的位置。我没有错误，我没有想法。有什么想法吗？

Answer 1

在 didMoveToView 的飞船代码中删除这一行

let spaceship = SKSpriteNode(imageNamed: "spaceship")

这样您实际上是在使用您在 touchesBegan 上面创建的全局属性。

您可能还想在 touchesMoved 中包含/移动您的代码。

 override func touchesMoved(touches: Set<UITouch>, withEvent event: UIEvent?) {

     for touch in touches {
         let location = touch.locationInNode(self)

          spaceship.position.x = location.x
     }  
 }

希望对你有帮助