在我使用 Swift 开发的游戏中,我希望玩家能够在类似商店的场景中选择背景,从而更改每个 SKScene 的背景。我试图使用 UserDefaults 来完成此任务,但由于某种原因它不起作用。这是商店场景的重要代码(我删除了不相关的代码):
import SpriteKit
class ShopScene: SKScene {
var backNumber = 90
var backRemainder = 0
var background = SKSpriteNode()
var backName:String = "back1"
override func didMove(to view: SKView) {
background.texture = SKTexture(imageNamed: "\(backName)")
background.size = self.size
self.addChild(background)
let nextButton: NButton = NButton(defaultButtonImage: "next", activeButtonImage: "nextP", buttonAction: nextAction)
addChild(nextButton)
let selectButton: SButton = SButton(defaultButtonImage: "next", activeButtonImage: "nextP", buttonAction: selectAction)
addChild(selectButton)
}
func selectAction() {
UserDefaults.standard.set(backName, forKey: "backSaved")
let sceneToMoveTo = MainMenuScene(size: self.size)
sceneToMoveTo.scaleMode = self.scaleMode
let sceneTransition = SKTransition.fade(withDuration: 0.4)
self.view!.presentScene(sceneToMoveTo, transition: sceneTransition)
}
func nextAction() {
backNumber += 1
backRemainder = backNumber % 3
switch backRemainder {
case 0:
backName = "back1"
case 1:
backName = "back2"
case 2:
backName = "back3"
default:
backName = "back1"
}
background.texture = SKTexture(imageNamed: "\(backName)")
}
}
正如您所看到的,当按下选择按钮时,Name 被保存。现在,这是主菜单场景的相关代码:
Import SpriteKit
class MainMenuScene: SKScene {
var backName = UserDefaults.standard.string(forKey: "backSaved")
override func didMove(to view: SKView) {
let background = SKSpriteNode(imageNamed: "\(backName)")
background.size = self.size
self.addChild(background)
按下“选择”按钮后,您应该切换到主菜单场景并看到背景是您选择的背景。但是,当我运行此命令时,我在白色背景中看到一个红色 X。我之前曾使用 UserDefaults 来保存分数,但我不明白为什么它在这种情况下不起作用。关于如何使用 UserDefaults 在 SKScene 之间传递字符串有什么想法吗?我做错了什么吗?
注意:虽然 Knight0fDragon 的答案被标记为正确,但他的答案适用于在场景之间传递字符串,但不适用于永久保存该值。如果您希望传递该值并保存它,请检查我的答案。
最佳答案
我建议不要执行UserDefaults
,这意味着您的应用程序的首选项。而是使用userData
func selectAction() {
let sceneToMoveTo = MainMenuScene(size: self.size)
sceneToMoveTo.scaleMode = self.scaleMode
sceneToMoveTo.userData = sceneToMoveTo.userData ?? NSMutableDictionary() //This lets us ensure userdata exists
sceneToMoveTo.userData!["backSaved"] = backName
let sceneTransition = SKTransition.fade(withDuration: 0.4)
self.view!.presentScene(sceneToMoveTo, transition: sceneTransition)
}
然后实现它:
import SpriteKit
class MainMenuScene: SKScene {
lazy var backName:String = {return self.userData?["backSaved"] as? String ?? "back1"}() //This allows us to load backName at the time it is needed, or assign back1 if doesn't exist
override func didMove(to view: SKView) {
let background = SKSpriteNode(imageNamed: backName)
self.addChild(background)
注意,我不确定as是否?需要字符串,尝试不使用它,看看 Swift 是否可以推断它
关于ios - 使用 UserDefaults 在 SKScene 之间传递字符串,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/44749416/