#EnvironmentObject bug in SwiftUI - swiftui

Question

When I press the Move button in the contextMenu, I change the isCopied and setOriginPath variables in the EnvironmentObject. When this change is made, the List view is cleared and I can't see anything on the screen. I don't have any problems when I don't use EnvironmentObject.
ContextMenu:
.contextMenu {
Button {
safeFileVM.hideSelectedFile(fileName: currentFile.fileName)
safeFileVM.takeArrayOfItems()
} label: {
HStack {
Text(!currentFile.isLock ? "Hide" : "Show")
Image(systemName: currentFile.isLock ? "eye" : "eye.slash")
}
}
Button {
safeFileClipboard.setOriginPath = URL(fileURLWithPath: currentFile.localPath)
safeFileClipboard.isCopied = true
} label: {
HStack {
Text("Move")
Image(systemName: "arrow.up.doc")
}
}
}
View:
struct DetailObjectView: View {
#ObservedObject var safeFileVM: SafeFileViewModel = SafeFileViewModel()
#EnvironmentObject var safeFileClipboard: SafeFileClipBoard
var currentFile: MyFile
var currentLocation = ""
var body: some View {
VStack {
.....
}
.contextMenu {
Button {
safeFileVM.hideSelectedFile(fileName: currentFile.fileName)
safeFileVM.takeArrayOfItems()
} label: {
HStack {
Text(!currentFile.isLock ? "Hide" : "Show")
Image(systemName: currentFile.isLock ? "eye" : "eye.slash")
}
}
Button {
safeFileClipboard.setOriginPath = URL(fileURLWithPath: currentFile.localPath)
safeFileClipboard.isCopied = true
} label: {
HStack {
Text("Move")
Image(systemName: "arrow.up.doc")
}
}
}
}
}
In the mini project below, when the EnvironmentObject value changes, navigation goes to the beginning. Why ? How can I fix this ?
Example Project:
Main:
#main
struct EnvironmentTestApp: App {
#StateObject var fooConfig: FooConfig = FooConfig()
var body: some Scene {
WindowGroup {
NavigationView {
ContentView()
.environmentObject(fooConfig)
}
}
}
}
ContentView:
struct ContentView: View {
#EnvironmentObject var fooConfig: FooConfig
private let numbers: [Number] = [.init(item: "1"), .init(item: "2"), .init(item: "3")]
var body: some View {
List {
ForEach(numbers, id: \.id) { item in
DetailView(itemNumber: item.item)
}
}
}
}
struct Number: Identifiable {
var id = UUID()
var item: String
}
DetailView:
struct DetailView: View {
#EnvironmentObject var fooConfig: FooConfig
var itemNumber: String = ""
var body: some View {
NavigationLink(destination: ContentView().environmentObject(fooConfig)) {
Text("\(itemNumber) - \(fooConfig.fooBool == true ? "On" : "Off")")
.environmentObject(fooConfig)
.contextMenu {
Button {
fooConfig.fooBool.toggle()
} label: {
HStack {
Text(fooConfig.fooBool != true ? "On" : "Off")
}
}
}
}
}
}
ObservableObject:
class FooConfig: ObservableObject {
#Published var fooBool: Bool = false
}

Answer 1

Move that from scene into ContentView, because scene is a bad place to update view hierarchy, it is better to do inside view hierarchy, so here
struct EnvironmentTestApp: App {
var body: some Scene {
WindowGroup {
ContentView() // only root view here !!
}
}
}
everything else is inside views, like
struct ContentView: View {
#StateObject private var foo = FooConfig()
var body: some View {
NavigationView {
MainView()
.environmentObject(foo) // << here !!
}
}
}
struct MainView: View {
#EnvironmentObject var fooConfig: FooConfig
private let numbers: [Number] = [.init(item: "1"), .init(item: "2"), .init(item: "3")]
var body: some View {
List {
ForEach(numbers, id: \.id) { item in
DetailView(itemNumber: item.item)
}
}
}
}
and so on...
Tested with Xcode 14 / iOS 16