如何在Swift 3.0中拖放一个精灵？

Question

我想要做的就是能够在屏幕上拖放一个精灵。我试过下面的代码：

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

override func touchesMoved(touches: Set<UITouch>, withEvent event: UIEvent?) { 
    for touch in (touches) { 
     let location = touch.locationInNode(self) 
     if ball.containsPoint(location) { 
      ball.position = location  
} 
} 
} 

此代码工作，但是，当我拖动球非常快，我想它检测到“球”不再包含点“位置”和球这意味着我再次拿起球。我希望球能够快速响应我的接触，以便球不会停止移动。我将如何做到这一点？

Answer 1

我在那里我已经子类一个UIImageView，并把它称为一个“DraggableImage”

override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) { 
     originalPosition = self.center 
    } 

override func touchesMoved(_ touches: Set<UITouch>, with event: UIEvent?) { 
     if let touch = touches.first { 
      let position = touch.location(in: self.superview) 
      self.center = CGPoint(x: position.x, y: position.y) 
     } 
    } 

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

     self.center = originalPosition 
    } 

Answer 2

这是做雪碧套件正确的方式实现。就像我在我的评论中所说的，您需要将移动节点分配到激活状态，在这种情况下，我使用一个名为movableNode的变量来执行我的激活状态。当你触球时，通过将其分配给movableNode而激活。然后，当您拖动手指时，movableNode将随着拖动一起移动，然后一旦释放，您就通过将movableNode设置为零来进入停用状态。请注意，此代码仅适用于单点触控应用程序，如果您想要处理多点触控，则需要跟踪哪个触控正在进行拖动。

var movableNode : SKNode? 

override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) { 
    if let touch = touches.first { 
     let location = touch.locationInNode(self) 
     if ball.containsPoint(location) { 
      movableNode = ball 
      movableNode!.position = location  
     } 
    } 
} 

override func touchesMoved(_ touches: Set<UITouch>, with event: UIEvent?) { 
    if let touch = touches.first where movableNode != nil { 
     movableNode!.position = touch.locationInNode(self) 
    } 
} 

override func touchesEnded(_ touches: Set<UITouch>, with event: UIEvent?) { 
    if let touch = touches.first where movableNode != nil { 
     movableNode!.position = touch.locationInNode(self) 
     movableNode = nil 
    } 
} 
override func touchesCancelled(_ touches: Set<UITouch>, with event: UIEvent?) { 
    if let touch = touches.first { 
     movableNode = nil 
    } 
} 

Answer 3

KnightOFDragon解决方案工作得很好。如果您不想将精灵中心位置移动到您的手指触摸屏幕的位置，并且您想将精灵从其中心原始位置移动，我只需添加几行。

var movableNode : SKNode? 
var ballStartX: CGFloat = 0.0 
var ballStartY: CGFloat = 0.0 

override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) { 
    if let touch = touches.first { 
     let location = touch.location(in: self) 
     if (map?.contains(location))! { 
      movableNode = ball 
      ballStartX = (movableNode?.position.x)! - location.x // Location X of your sprite when touch started 
      ballStartY = (movableNode?.position.y)! - location.y // Location Y of your sprite when touch started 
     } 
    } 
} 

override func touchesMoved(_ touches: Set<UITouch>, with event: UIEvent?) { 
    if let touch = touches.first, movableNode != nil { 
     let location = touch.location(in: self) 
     movableNode!.position = CGPoint(x: location.x+ballStartX, y: location.y+ballStartY) // Move node around with distance to your finger 
    } 
} 

override func touchesEnded(_ touches: Set<UITouch>, with event: UIEvent?) { 
    if let _ = touches.first, movableNode != nil { 
     movableNode = nil 
    } 
} 
override func touchesCancelled(_ touches: Set<UITouch>, with event: UIEvent?) { 
if let touch = touches.first { 
    movableNode = nil 
}