Question

我的代码正在制作一个随机生成的迷宫，基本上迷宫是用网格（数组）制作的，每个网格单元都有4个bool类型的变量（向上，向下，向左，向右），这些变量都指向单元格墙壁。墙的真或假是随机选择的。如果墙是真的那么就有一面墙，但是是假的，那里就没有墙了。

但是，所有这些都发生在Maze类和GameScene类中。在GameScene.swift内，我创建了一个enum wallSides，其状态为'upSide，downSide，leftSide，rightSide，noSide＆＃39; （基本上是指用户点击的单元格的侧壁）：

enum wallSides {
    case upSide, downSide, leftSide, rightSide, noSide
}

我在func ConvertLocationPointtoGridPosition中使用这些状态，它接收CGPoint位置并转换并将其作为x，y整数返回（以查找它在网格中的哪个单元格）。该函数还使用所需的位置，使用upSide, downSide, leftSide, rightSide, noSide状态找出位置点所在的单元格墙，并返回wallSide：

func ConvertLocationPointToGridPosition(location: CGPoint) -> (x: Int, y: Int, side: wallSides) {
    var xPoint: CGFloat
    var yPoint: CGFloat
    xPoint = location.x / CGFloat(tileSize)
    yPoint = location.y / CGFloat(tileSize)
    let yPointRemainder = yPoint.truncatingRemainder(dividingBy: 1)
    let xPointRemainder = xPoint.truncatingRemainder(dividingBy: 1)
    var wallSide: wallSides

    if yPointRemainder < 0.2 && xPointRemainder < 0.8 && xPointRemainder > 0.2 {
        wallSide = .downSide
    } else if yPointRemainder > 0.8 && xPointRemainder < 0.8 && xPointRemainder > 0.2 {
        wallSide = .upSide
    } else if xPointRemainder < 0.2 && yPointRemainder < 0.8 && yPointRemainder > 0.2 {
        wallSide = .leftSide
    } else if  xPointRemainder > 0.8 && yPointRemainder < 0.8 && yPointRemainder > 0.2 {
        wallSide = .rightSide
    } else {
        wallSide = .noSide
    }//end of if-then

    return(Int(xPoint), Int(yPoint), wallSide)
}

我想要做的是在func TouchesBegan内，如果用户点击的节点是墙，并且＆＃34;如果墙状态是右侧，那么做一些事情＆＃34;但我不确定如何从fConvertLocationPointToGridPosition访问枚举的状态和变量：

override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
    //actually user tapping a wall
    //send a message that the wall has been tapped
    let touch = touches.first!              // Get the first touch
    let location  = touch.location(in: self) //find the location of the touch in the view
    let nodeAtPoint = atPoint(location) //find the node at that location
    if nodeAtPoint.name == "mazeWall" {
        ConvertLocationPointToGridPosition(location: location)
        //self.removeChildren(in: [self.atPoint(location)])

        //if  side == wallSides.downSide {
            //code
        //}
    }//end of nodeAtPoint = mazeWall if-then statement
}

请帮我解释如何做到这一点。

Answer 1

如果我理解正确，则问题是访问多个返回值。试试这个

    override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
    //actually user tapping a wall
    //send a message that the wall has been tapped
    let touch = touches.first!              // Get the first touch
    let location  = touch.location(in: self) //find the location of the touch in the view
    let nodeAtPoint = atPoint(location) //find the node at that location
    if nodeAtPoint.name == "mazeWall" {

        let (x, y, side) = ConvertLocationPointToGridPosition(location: location)
        //self.removeChildren(in: [self.atPoint(location)])

        if  side == wallSides.downSide {
        //code
        }
    }//end of nodeAtPoint = mazeWall if-then statement
}

另一个版本。

let position = ConvertLocationPointToGridPosition(location: location)
print("side: \(position.2)")

如何从另一个函数访问枚举状态

1 个答案: