ios - Swift Spritekit 计数触摸

Question

我想在一个节点上执行多项操作。

因此，例如，在第一次触摸此节点时，第一个操作应该运行。第二次触摸:第二个 Action 应该运行。

下面是带有 touches.count 的无效代码示例。

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

        if node == myNode {
            if touches.count == 1 {
                action1()
            }
            if touches.count == 2 {
                action2()
            }
            if touches.count == 3 {
                action3()
            }
        }
    }
}

Answer 1

您需要一个成员变量来跟踪自您的应用程序启动以来的触摸次数。 touches.count 方法不是累积的。

var cumulativeNumberOfTouches = 0

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

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

        if node == myNode {

            cumulativeNumberOfTouches += 1

            switch cumulativeNumberOfTouches {
            case 1:
                action1()
            case 2:
                action2()
            case 3:
                action3()
            default:
                /* do something or nothing or whatever */
                println("\(cumulativeNumberOfTouches) touches")
            }
        }
    }

}