如何在不拖動的情況下輕彈/滑動精靈？

好吧，目前在我的遊戲中，我可以拖動，滑動並輕拂節點。但是，我希望用戶只能輕掃/輕拂節點，並且我不希望用戶能夠拖動節點。我怎樣才能做到這一點？如何在不拖動的情況下輕彈/滑動精靈？

這裏是我當前的代碼：

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

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

     if ball.frame.contains(location) { 
      touchPoint = location 
      touching = true 
     } 
    } 
} 

override func touchesMoved(_ touches: Set<UITouch>, with event: UIEvent?) { 
    let touch = touches.first as UITouch! 
    let location = touch!.location(in: self) 
    touchPoint = location 

    for touch in touches { 
     let location = touch.location(in: self) 
     touchPoint = location 
     if touching { 
      if touchPoint != ball.position { 
       let dt:CGFloat = 1.0/60.0 
       let distance = CGVector(dx: touchPoint.x-ball.position.x, dy: touchPoint.y-ball.position.y) 
       let velocity = CGVector(dx: distance.dx/dt, dy: distance.dy/dt) 
       ball.physicsBody!.velocity=velocity 
      } 
     } 
    } 
} 

override func touchesEnded(_ touches: Set<UITouch>, with event: UIEvent?) { 
    touching = false 

    for touch in touches { 
     let location = touch.location(in: self) 
     touchPoint = location 
     let node = self.atPoint(location) 
    } 
}

來源

2016-10-24 Josh Schlabach

請定義更清楚你想達到什麼。 – matthiaswitt

我在猜測：你的目標是讓節點不動，直到手指從滑動手勢釋放爲止，此時手指在屏幕上的移動速度和距離決定了節點的移動速度和方向？ – Confused