点击时精灵方向改变？答案

【问题标题】：Sprite direction change when tapped?点击时精灵方向改变？
【发布时间】：2017-06-29 18:37:32
【问题描述】：

我试图让精灵在 touchesBegan 时向左移动，然后在用户下次触摸时向右移动。

我看到了一些我认为可以完美运行的代码，但是我不太清楚如何定义“isMovingleft”

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

    if isMovingleft == true  {
        let left = SKAction.moveBy(x: 500, y: 0, duration: 5)
        ship.run(left)
    }
    else {
        let right = SKAction.moveBy(x: -500, y: -900, duration: 5)
        ship.run(right)
    }
    isMovingleft = !isMovingleft


}

【问题讨论】：

标签： ios swift sprite skaction

【解决方案1】：

enum Direction: Int {
    case left = 0
    case right
}

var direction: Direction?

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

    ship.removeAllActions()

    switch direction ?? .left {
    case .left:
        ship.run(SKAction.moveBy(x: 500, y: 0, duration: 5))
        direction = .right
    case .right:
        ship.run(SKAction.moveBy(x: -500, y: -900, duration: 5))
        direction = .left
    }
}

【讨论】：