Swiftui Switfui如何从NavigationLink设置环境对象

我想在视图2中显示我在视图1中选择的元素。我编写了这个简单的代码，但它不起作用，因为我不知道如何在

NavigationLink

中设置

dataStore

。有人能修改代码使其正常工作吗

import SwiftUI

class DataStore: ObservableObject {
    @Published var itemNumber = 0
}

struct ContentView: View {

    @EnvironmentObject var dataStore:DataStore

    var body: some View {
        TabView {
            // First View Tab
            NavigationView {
                List(0..<5) { item in
                    NavigationLink(destination: DetailView().environmentObject(self.dataStore)) {
                        Text("Item: \(item)")
                    }
                }
            }
            .tabItem {
                Text("View 1")
            }            
            // Second View Tab
            Text("This is the item selected in View Tab 1: \(dataStore.itemNumber)")
                .tabItem {
                    Text("View 2")
            }
        }
    }
}

struct DetailView:View {
    @EnvironmentObject var dataStore:DataStore
    var body: some View {
        Text("Item: \(dataStore.itemNumber)")
    }
}

---

如果您需要依赖项，那么就找到在哪里进行依赖项注入

以下是可能的方法。使用Xcode 11.4/iOS 13.4进行测试

struct ContentView: View {

    @EnvironmentObject var dataStore:DataStore

    var body: some View {
        TabView {
            // First View Tab
            NavigationView {
                List(0..<5) { item in
                    NavigationLink(destination: DetailView(item: item)) {
                        Text("Item: \(item)")
                    }
                }
            }
            .tabItem {
                Text("View 1")
            }
            // Second View Tab
            Text("This is the item selected in View Tab 1: \(dataStore.itemNumber)")
                .tabItem {
                    Text("View 2")
            }
        }
    }
}

struct DetailView:View {
    let item: Int
    @EnvironmentObject var dataStore:DataStore
    var body: some View {
        Text("Item: \(dataStore.itemNumber)")
        .onAppear {
            self.dataStore.itemNumber = self.item
        }
    }
}

struct ContentView:View{
@EnvironmentObject变量数据存储：数据存储
var body：一些观点{
TabView{
//第一视图选项卡
导航视图{
列表（0..我也使用了您相同的方法，但我想了解是否还有其他方法。谢谢。
struct ContentView: View {

    @EnvironmentObject var dataStore:DataStore

    var body: some View {
        TabView {
            // First View Tab
            NavigationView {
                List(0..<5) { item in
                    NavigationLink(destination: DetailView(item: item)) {
                        Text("Item: \(item)")
                    }
                }
            }
            .tabItem {
                Text("View 1")
            }
            // Second View Tab
            Text("This is the item selected in View Tab 1: \(dataStore.itemNumber)")
                .tabItem {
                    Text("View 2")
            }
        }
    }
}

struct DetailView:View {
    let item: Int
    @EnvironmentObject var dataStore:DataStore
    var body: some View {
        Text("Item: \(dataStore.itemNumber)")
        .onAppear {
            self.dataStore.itemNumber = self.item
        }
    }
}