仅在触摸时拖动 SKSpriteNode

Question

我有一个 SKSpriteNode，我想通过 touchesMoved 在屏幕上拖动它。但是，如果触摸不是首先发生在精灵的位置（不在场景中跳跃），我不希望精灵移动。

我有一个间歇性的解决方案，但我相信有些东西更优雅、更实用，因为这个解决方案不能正常工作——如果用户拖动精灵非常快。

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

        var touchPoint : CGPoint = location
        var muncherRect = muncherMan.frame
        if (CGRectContainsPoint(muncherRect, touchPoint)) {
            muncherMan.position = location
        } else {

        }
    }
}

Answer 1

您可以实现这三个方法来实现您想要的：touchesBegan、touchesMoved 和 touchesEnded。当您触摸 muncherMan 时，将 muncherManTouched 设置为 true，这表明 muncherMan 可能会在下一帧中移动。完成移动或触摸时，设置 muncherManTouched false 并等待下一次触摸。

这是示例代码。我为 muncherMan 添加了一个名称，这样我们就可以确定 touchesBegan.

中哪个节点被触摸了

var muncherManTouched = false
override func didMoveToView(view: SKView) {
    /* Setup your scene here */
    ...
    muncherMan.name = "muncherMan"
    self.addChild(muncherMan)
}

override func touchesBegan(touches: Set<UITouch>, withEvent event: UIEvent?) {
    /* Called when a touch begins */ 
    for touch in touches {
        let location = touch.locationInNode(self)
        let nodeTouched = self.nodeAtPoint(location)
        if (nodeTouched.name == "muncherMan") {
            muncherManTouched = true
        }
    }
}

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

override func touchesEnded(touches: Set<UITouch>, withEvent event: UIEvent?) {
    muncherManTouched = false
}

仅在触摸时拖动 SKSpriteNode

Dragging an SKSpriteNode only when touched

ios

swift

sprite-kit

swift2

skspritenode