在场景中选择一个点来放置一个节点（SpriteKit，Swift）

Question

我想这样做，当玩家按下标签时，他必须再次按下屏幕上的一个点来选择建造房屋的地方。到现在为止，这就是我所得到的：当玩家按下标签“build”时，布尔值（“wantsToBuild”）被设置为 true，但现在显然房子是建在标签之上的。我不知道如何检查那个地方是否已经很忙，或者玩家是否可以在那里建造。我想过有一些占位符，但我不知道如何正确设置它们。你能帮我解决这个问题吗？谢谢你。 编辑：我已经按照答案中的建议更改了问题中的代码，但现在我遇到了几个问题：即使我'，操纵杆（我之前没有提到过）也会移动m 不要触摸操纵杆本身。另外，即使我已经用打印语句检查了想要构建的值，并且它似乎设置为 false，但每当我按下屏幕时，总是会建造房子。你能帮我进一步吗？

类 GameScene：SKScene {

var ship  = LCDShip()
var shipSpeed : CGFloat = 0.08
var base = SKSpriteNode(imageNamed: "base")
var joystick = SKSpriteNode(imageNamed: "joystick")
var joystickActive = false

var length:CGFloat! = nil
var xDist:CGFloat! = nil
var yDist:CGFloat! = nil

var deltaVector:CGVector! = nil

let build = SKLabelNode()
var wantsToBuild = false

override func didMoveToView(view: SKView) {

    build.name = "build"
    build.fontName = "Chalkduster"
    build.fontSize = 25
    build.text =  "Build a house"
    build.zPosition = 2
    build.position = CGPoint(x: self.frame.width/2, y: self.frame.height/2)
    addChild(build)


    backgroundColor = SKColor.blackColor()
    ship.position = CGPoint(x: self.frame.width/2, y: self.frame.height/2)
    addChild(ship)

    base.position = CGPoint(x: 150, y: 200)
    base.setScale(2)
    base.alpha = 0.3
    addChild(base)

    joystick.position = base.position
    joystick.setScale(2)
    joystick.alpha = 0.4
    joystick.name = "base"
    addChild(joystick)
}

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

    for touch in touches {
        let house = SKSpriteNode(imageNamed: "house")
        let location = touch.locationInNode(self)
        let node = nodeAtPoint(location)
        let label = self.childNodeWithName("build")!

        if node.name == "build"{
            print("where should i build the hosue?")
            wantsToBuild = true
        } else if wantsToBuild == true && node.name != "house" && location.x <= label.position.x - 15 || location.x >= label.position.x + 15 || location.y >= label.position.y + 15 || location.y <= label.position.y - 15 {
            house.position = location
            house.name = "house"
            addChild(house)
            wantsToBuild = false
        }
    }
}
override func touchesMoved(touches: Set<UITouch>, withEvent event: UIEvent?) {
    for touch in touches {
        let location = touch.locationInNode(self)
        deltaVector = CGVector(dx: location.x - base.position.x, dy: location.y - base.position.y)

        let angle = atan2(deltaVector.dy, deltaVector.dx)

        length = base.frame.size.height/2

        xDist = sin(angle - 1.57079633) * length
        yDist = cos(angle - 1.57079633) * length

        if(CGRectContainsPoint(base.frame, location)){
            joystick.position = location
        } else {
            joystick.position = CGPointMake(base.position.x - xDist, base.position.y + yDist)
        }

        ship.zRotation = angle - 1.57079633
    }
}

override func update(currentTime: NSTimeInterval) {
    if deltaVector != nil {
        ship.position.x += deltaVector.dx * shipSpeed
        ship.position.y += deltaVector.dy * shipSpeed
    }
}

}

Answer 1

Bogy 的方法可行，但您可能希望它是 && node.name!= "build"，除非您要建造多个房屋，在这种情况下您可能会同时希望 node.name != "build" && node.name != "house"

无论如何... 这种方法会起作用，除非你的房子精灵足够大，当你触摸标签旁边而不是实际标签时，房子可能会与标签重叠，并且基本上仍然在标签的顶部。同样，IDK 精灵大小和所有内容。要处理这种情况，您可以在标签周围创建一个不允许放置的范围，方法是：

 let label = self.childNodeWithName("build")!

 if wantsToBuild == true && (location.x <= label.position.x - 15 || location.x >= label.position.x + 15 || location.y <= label.position.y - 15 || location.y >= label.position.y + 15) {
        let sprite = SKSpriteNode(imageNamed: "house")
        sprite.position = location
        addChild(sprite)
        wantsToBuild = false
    }

这会在标签周围创建一个更大的盒子，并且不允许您将房子放在那个盒子里，所以如果你把盒子做得足够大（你可能不得不修补 + 15 和 - 15's)，即使您将其尽可能靠近标签，也无法将其放置得足够近以重叠。

如果你的标签是一个精灵，而不是一个 SKLabelNode，你可以按照 Bogy 的说法去做，只需在实际的精灵图像上添加一个不可见空间的边框，这样离不在的精灵最近的点精灵将足够远，不会重叠。

Answer 2

我觉得你的条件不好，我没有什么可以尝试的，但我会做这样的事情：

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

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

        if node.name == "build"{
            print("where should i build the house?")
            wantsToBuild = true
        }
        else if wantsToBuild == true && node.name != "house" {
            let sprite = SKSpriteNode(imageNamed: "house")
            sprite.position = location
            sprite.name = "house"
            addChild(sprite)
            wantsToBuild = false
        }
    }
}

Answer 3

所以我实际上通过清理我的代码并更好地使用您的建议来解决问题。不确定这是不是很棒的代码，但它可以工作。我添加了一个成本和几个 if 语句。这是我现在拥有的，以防有人发现它有用:)

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

    for touch in touches {
        let location = touch.locationInNode(self)
        let node = nodeAtPoint(location)
        if CGRectContainsPoint(base.frame, location){
            joystickActive = true
        }else {
            joystickActive = false
            if node.name == "build" {
                wantsToBuild = true
            } else if node.name != "house" {
                checkPlace(location)
                wantsToBuild = false
            }
        }
    }
}

func checkPlace(location : CGPoint) {
    let label = self.childNodeWithName("build")!
    let deltaX = location.x - label.position.x
    let deltaY = location.y - label.position.y
    let houseRadius : CGFloat = 60

    let distance = sqrt(deltaX * deltaX + deltaY * deltaY)
    if distance <= houseRadius{
        print("YOU CANNOT BUILD HERE")
    } else if distance > houseRadius && wantsToBuild == true{
        if money > 0 {
            buildConstruction(10, location: location)
        }
    }
}

func buildConstruction(cost: Int, location: CGPoint) {
    let house = SKSpriteNode(imageNamed: "house")
    house.position = location
    house.name = "house"
    addChild(house)
    money -= cost
    print(money)
}

再次感谢@Arkidillo 和@Bogy 让我走上正轨:)