用SpriteKit拋出一個對象

Question

我現在有下面的代碼。即使代碼構建成功，我似乎無法使其工作。我試圖做到這一點，當你輕彈物體時，它會以開始和結束觸摸的速度移動。

import SpriteKit 
class GameScene: SKScene { 
    var sprite: SKSpriteNode! 
    var touchPoint: CGPoint = CGPoint() 
    var touching: Bool = false 
    override func didMoveToView(view: SKView) { 
     self.physicsBody = SKPhysicsBody(edgeLoopFromRect: self.frame) 
     sprite = SKSpriteNode(color: UIColor.redColor(), size: CGSize(width: 50, height: 50)) 
     sprite.physicsBody = SKPhysicsBody(rectangleOfSize: sprite.size) 
     sprite.position = CGPoint(x: self.size.width/2.0, y: self.size.height/2.0) 
     self.addChild(sprite) 
    } 

    //for touch: AnyObject in touches { 
    //let location = touch.locationInNode(self) 
    //let touchedNode = self.nodeAtPoint(location) 

    override func touchesBegan(touches: Set<NSObject>, withEvent event: UIEvent) { 
     for touch: AnyObject in touches { 

     let location = touch.locationInNode(self) 
     if sprite.frame.contains(location) { 
      touchPoint = location 
      touching = true 
     } 
    } 
    func touchesMoved(touches: Set<NSObject>, withEvent event: UIEvent) { 
     for touch: AnyObject in touches { 
     let location = touch.locationInNode(self) 
     touchPoint = location 
    } 
    func touchesEnded(touches: Set<NSObject>, withEvent event: UIEvent) { 
     touching = false 
    } 
    func update(currentTime: CFTimeInterval) { 
     if touching { 
      let dt:CGFloat = 1.0/60.0 
      let distance = CGVector(dx: touchPoint.x-sprite.position.x, dy: touchPoint.y-sprite.position.y) 
      let velocity = CGVector(dx: distance.dx/dt, dy: distance.dy/dt) 
      sprite.physicsBody!.velocity = velocity 
     } 
    } 
}}} 

Answer 1

你不小心放置touchesMoved，touchesEnded和update內touchesBegan。除此之外，你的代碼工作。暗示有問題的是您不需要以touchesMoved,touchesEnded或update與override的前綴作爲前綴。在未來，我會建議使用斷點和打印語句來檢查你期望執行的方法，事實上它們正在運行。這樣做，你會看到你的版本touchesMoved,touchesEnded和update沒有被調用。

總之，這裏的修正它它，現在它完美的作品：

import SpriteKit 
class GameScene: SKScene { 
    var sprite: SKSpriteNode! 
    var touchPoint: CGPoint = CGPoint() 
    var touching: Bool = false 
    override func didMoveToView(view: SKView) { 
     self.physicsBody = SKPhysicsBody(edgeLoopFromRect: self.frame) 
     sprite = SKSpriteNode(color: UIColor.redColor(), size: CGSize(width: 50, height: 50)) 
     sprite.physicsBody = SKPhysicsBody(rectangleOfSize: sprite.size) 
     sprite.position = CGPoint(x: self.size.width/2.0, y: self.size.height/2.0) 
     self.addChild(sprite) 
    } 

    override func touchesBegan(touches: Set<NSObject>, withEvent event: UIEvent) { 
     for touch: AnyObject in touches { 

      let location = touch.locationInNode(self) 
      if sprite.frame.contains(location) { 
       touchPoint = location 
       touching = true 
      } 
     } 
    } 

    override func touchesMoved(touches: Set<NSObject>, withEvent event: UIEvent) { 
     for touch: AnyObject in touches { 
      let location = touch.locationInNode(self) 
      touchPoint = location 
     } 
    } 

    override func touchesEnded(touches: Set<NSObject>, withEvent event: UIEvent) { 
     touching = false 
    } 

    override func touchesCancelled(touches: Set<NSObject>!, withEvent event: UIEvent!) { 
     touching = false 
    } 

    override func update(currentTime: NSTimeInterval) { 
     if touching { 
      let dt:CGFloat = 1.0/60.0 
      let distance = CGVector(dx: touchPoint.x-sprite.position.x, dy: touchPoint.y-sprite.position.y) 
      let velocity = CGVector(dx: distance.dx/dt, dy: distance.dy/dt) 
      sprite.physicsBody!.velocity = velocity 
     } 
    } 
}