为@EnvironmentObject设置SceneDelegate时编译器警告
为@EnvironmentObject设置SceneDelegate时编译器警告
提问于 2022-07-01 17:45:09
我试图实现@EnvironmentObject，将数组从一个选项卡中的View传递到另一个选项卡中的另一个视图。
我收到黄色编译器警告：
从未使用不可变值“reportView”的
初始化；考虑将其替换为“_”或删除它
在SceneDelegate.swift中
这是我的SceneDelegate.swift：
import UIKit
import SwiftUI
class SceneDelegate: UIResponder, UIWindowSceneDelegate {
var window: UIWindow?
var questionsAsked = QuestionsAsked()
func scene(_ scene: UIScene, willConnectTo session: UISceneSession, options connectionOptions: UIScene.ConnectionOptions) {
ProductsStore.shared.initializeProducts()
if let windowScene = scene as? UIWindowScene {
let window = UIWindow(windowScene: windowScene)
window.rootViewController = UIHostingController(rootView: MotherView().environmentObject(ViewRouter()))
self.window = window
window.makeKeyAndVisible()
}
let reportView = ReportView().environmentObject(questionsAsked)
}
}这是我的ObservabelObject：
import Foundation
class QuestionsAsked: ObservableObject {
@Published var sectionThings = [SectionThing]()
@Published var memoryPalaceThings = [MemoryPalaceThing]()
}我用：
@EnvironmentObject var questionsAsked: QuestionsAsked在我看来，这将生成要传递的数据。
我传递的数据如下：
questionsAsked.sectionThings = testSectionThings ?? []在要传递数据的视图中，我有：
@EnvironmentObject var questionsAsked: QuestionsAsked然后，我按以下方式访问：
totalThings += questionsAsked.sectionThings.count
totalThings += questionsAsked.memoryPalaceThings.count回答 1
Stack Overflow用户
发布于 2022-07-01 20:08:08
这里的问题是，这条线是无用的，因为它不会出现在现场。唯一显示的视图是MotherView。为了将questionsAsked向下传递到该视图，您只需像其他.environmentObject一样追加它。因此，应改为：
class SceneDelegate: UIResponder, UIWindowSceneDelegate {
var window: UIWindow?
// this really need to be @StateObject´s
@StateObject var viewRouter = ViewRouter()
@StateObject var questionsAsked = QuestionsAsked()
func scene(_ scene: UIScene, willConnectTo session: UISceneSession, options connectionOptions: UIScene.ConnectionOptions) {
ProductsStore.shared.initializeProducts()
if let windowScene = scene as? UIWindowScene {
let window = UIWindow(windowScene: windowScene)
//Inject them here into the MotherView
window.rootViewController = UIHostingController(rootView: MotherView().environmentObject(viewRouter).environmentObject(questionsAsked))
self.window = window
window.makeKeyAndVisible()
}
}
}在MotherView和降序视图中，您现在可以通过@EnvironmentObject包装器访问它们。
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原文链接：
https://stackoverflow.com/questions/72832941
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