从 SpriteKit 中的另一个类或场景访问 var

Question

我正在SpriteKit 中构建一个游戏，其中包括一个玩家从 7 个选项中选择一个角色。场景 1 将包括 7 张图像。每个图像将代表一个字符。玩家将通过按下所选图像来选择角色，并将呈现新的场景 2。我希望所选角色图像出现在场景 2 中。我在场景 1 中保存了所选角色的数据，但是当场景 2 出现时，它总是显示角色 1 而不是另一个。请告知从场景 1 访问 var 并将其带到场景 2 的正确代码行。

import SpriteKit

class Scene1: SKScene {

var Player1 = SKSpriteNode()
var Player2 = SKSpriteNode()
var Player3 = SKSpriteNode()
var Player4 = SKSpriteNode()
var Player5 = SKSpriteNode()
var Player6 = SKSpriteNode()
var Player7 = SKSpriteNode()

var playerSelect1 = false
var playerSelect2 = false
var playerSelect3 = false
var playerSelect4 = false
var playerSelect5 = false
var playerSelect6 = false
var playerSelect7 = false

// in touches began..
if self.nodeAtPoint(location) == self.player1 {
        playerSelect1 = true
NSUserDefaults.standardUserDefaults().setBool(true, forKey:"playerSelect1")

// then i present scene2

} else if self.nodeAtPoint(location) == self.player2 {
        playerSelect2 = true
NSUserDefaults.standardUserDefaults().setBool(true, forKey:"playerSelect2")

//then i present scene2

} else if self.nodeAtPoint(location) == self.player3 {
        playerSelect3 = true
NSUserDefaults.standardUserDefaults().setBool(true, forKey:"playerSelect3")

//then i present scene2

} else if self.nodeAtPoint(location) == self.player4 {
        playerSelect4 = true
NSUserDefaults.standardUserDefaults().setBool(true, forKey:"playerSelect4")

//then i present scene2
// i didn't list all 7 characters to make code shorter


class Scene2: SKScene {
var playerSelected: Scene1()

// did move to view
var character1 = SKSpriteNode()
var character2 = SKSpriteNode()
var character3 = SKSpriteNode()
var character4 = SKSpriteNode()

//grab the selection value
let playerSelect1 =          NSUserDefaults.standardUserDefaults().boolForKey("playerSelect1")

let playerSelect2 =          NSUserDefaults.standardUserDefaults().boolForKey("playerSelect2")

let playerSelect3 =          NSUserDefaults.standardUserDefaults().boolForKey("playerSelect3")

let playerSelect4 =          NSUserDefaults.standardUserDefaults().boolForKey("playerSelect4")

if playerSelect1 == true {
self.addChild(character1)
} else if playerSelect2 == true {
self.addChild(character2)
} else if playerSelect3 == true {
self.addChild(character3)
} else if playerSelect4 == true {
self.addChild(character4)
}
}

Answer 1

关于您的问题，您可以通过多种方式来实现您想要的。现在我个人只在需要与今天的分机进行交流时使用NSUserDefaults。您可能还想稍后保存您的数据文件，所以我想到了：

class Settings: NSObject { // NSCoding in case you want to save your data
    var playerGender: [Bool]! = [Bool]()
    func encodeWithCoder(aCoder: NSCoder!) {
        aCoder.encodeObject(playerGender, forKey: "playerGender")
    }
    init(coder aDecoder: NSCoder!) {
        playerGender = aDecoder.decodeObjectForKey("playerGender") as! [Bool]
    }
    override init() {
        super.init()
        self.playerGender = Array(count:7, repeatedValue:false)
    }
}
class GameManager: NSObject {
    static let sharedInstance = GameManager()
    var settings : Settings! = Settings()
}
class Scene1: SKScene {
    let gameManager = GameManager.sharedInstance
    var player : [SKSpriteNode]?
    override func didMoveToView(view: SKView) {
        // in touches began..
        if self.nodeAtPoint(location) == self.player1 {
            gameManager.settings.playerGender[0] = true
        }
    }
}
class Scene2: SKScene {
    let gameManager = GameManager.sharedInstance
    var character : [SKSpriteNode]?
    override func didMoveToView(view: SKView) {
        //grab the selection value
        let playerSelect1 = gameManager.settings.playerGender[0] //it's true
    }
}

说明： Settings 是一个可以编写游戏设置的类，以后还可以将属性值保存到文件中。

GameManager是一个共享实例，你可以在哪里调用它。

Answer 2

让我们考虑一下用户第一次选择播放器 1。您将所选播放器作为 Bool 存储在 NSUserDefaults 中。此值将保留在本地存储中，直到您更改它，即使在应用程序关闭后。所以下次用户选择播放器 2 时，您将 Bool 设置为 playerSelect2。问题是，在Scene2 中，您开始您的if 语句检查是否playerSelect1 == true，这是因为您将它设置为true 一次并且从未将其更改回来。使用您当前的方法，您必须将所需的playerSelect 设置为true，但还要将所有其他设置为false。我建议更改您的策略，将与所选玩家对应的String 存储在NSUserDefaults 中。这样的事情应该可以帮助您入门。

当你要设置选中的播放器时：

if self.nodeAtPoint(location) == self.player1 {
     NSUserDefaults.standardUserDefaults().setObject("playerSelect1", forKey: "selectedPlayer")
else if self.nodeAtPoint(location) == self.player2 {
NSUserDefaults.standardUserDefaults().setObject("playerSelect2", forKey: "selectedPlayer")
else if ...

当你想确定Scene2中选择了哪个玩家时：

//grab the value from local storage
let selectedPlayer = NSUserDefaults.standardUserDefaults().objectForKey("selectedPlayer") as! String

if selectedPlayer == "playerSelect1" {
        //handle player 1 case
}
else if selectedPlayer == "playerSelect2" {
        //handle player 2 case
}