swift - 背景图像节点干扰触摸命令

Question

我正在创建一个游戏场景，它包含两个节点，其中一个是背景节点。但是调用touchesbegan命令时，注册的节点是后台节点，不是我要求移动的节点。

override func touchesBegan(touches: NSSet, withEvent event: UIEvent) {

    for touch: AnyObject in touches{
        let touchLocation = touch.locationInNode(self)
        let touchedNode = nodeAtPoint(touchLocation)
        touchedNode.position = touchLocation
    }

}

Answer 1

这是一个如何允许用户拖放节点的示例:

let background = SKSpriteNode(color:SKColor.blueColor(),size:CGSizeMake(200, 200))
let player = SKSpriteNode(color: SKColor.whiteColor(), size: CGSizeMake(32, 32))
var selectedNode:SKNode?

override func didMoveToView(view: SKView) {
    let point = CGPointMake (CGRectGetWidth(view.frame)/2,CGRectGetHeight(view.frame)/2)
    background.position = point
    background.zPosition = 0
    self.addChild(background)

    // Give the node a name so we can identify it in the touch handler
    player.name = "player"
    // Ensure that the player rendered over the background
    player.zPosition = 1
    player.position = point
    self.addChild(player)
}

选择用户触摸的节点

override func touchesBegan(touches: NSSet, withEvent event: UIEvent) {
    for touch: AnyObject in touches{
        let touchLocation = touch.locationInNode(self)
        let touchedNode = nodeAtPoint(touchLocation)
        // Only allow the user to select "player" nodes
        if (touchedNode.name == "player") {
            selectedNode = touchedNode;
        }
    }
}

随着触摸位置的变化更新选中节点的位置

override func touchesMoved(touches: NSSet, withEvent event: UIEvent) {
    for touch: AnyObject in touches{
        let touchLocation = touch.locationInNode(self)
        if (selectedNode != nil) {
            selectedNode!.position = touchLocation
        }
    }
}

触摸结束时取消选中节点

override func touchesEnded(touches: NSSet, withEvent event: UIEvent) {
    selectedNode = nil;
}