I'm using #EnvironmentObject in SwiftUI and I got this "View.environmentObject(_:) for ViewModel may be missing as an ancestor of this view" Error - swiftui

Question

My code is something like this:
class ViewModel: ObservableObject {
#Published var value = ""
}
struct ContentView: View {
#StateObject var viewModel = ViewModel()
var body: some View {
Group {
if viewModel.userSession != nil {
MyTabView()
} else {
LoginView()
}
}
.environmentObject(viewModel)
}
}
struct MyTabView: View {
var body: some View {
TabView {
View1()
.tabItem{}
View2()
.tabItem{}
View3()
.tabItem{}
View4()
.tabItem{}
}
}
}
struct View4: View {
#EnvironmentObject var viewModel: ViewModel
var body: some View {
NavigationView {
NavigationLink(destination: EditView().environmentObject(viewModel)){
Text("Edit")
}
}
}
}
struct EditView: View {
#EnvironmentObject var viewModel: ViewModel
var body: some View {
if viewModel.value != "" { //this is where I get the error
Text("\(viewModel.value)")
}
}
}
I've tried putting the environmentObject at MyTabView() in ContentView()
struct ContentView: View {
#StateObject var viewModel = ViewModel()
var body: some View {
Group {
if viewModel.userSession != nil {
MyTabView().environmentObject(viewModel)
} else {
LoginView()
}
}
}
}
I've tried putting the environmentObject at NavigationView in View4()
struct View4: View {
#EnvironmentObject var viewModel: ViewModel
var body: some View {
NavigationView {
NavigationLink(destination: EditView()){
Text("Edit")
}
}.environmentObject(viewModel)
}
}
The value from ViewModel is not getting passed into the EditView. I have tried many solutions I can find but non of those are helping with the error.
Can anyone please let me know what have I done wrong?

Answer 1

Here is the test code I used (entirely based on yours) that shows
"...The value from ViewModel is getting passed into the EditView...".
Unless I missed something, the code you provide does not reproduce the error you show.
class ViewModel: ObservableObject {
#Published var value = ""
#Published var userSession: String? // <-- for testing
}
struct ContentView: View {
#StateObject var viewModel = ViewModel()
var body: some View {
Group {
if viewModel.userSession != nil {
MyTabView()
} else {
LoginView()
}
}.environmentObject(viewModel)
}
}
struct MyTabView: View {
var body: some View {
TabView {
Text("View1").tabItem{Text("View1")}
Text("View2").tabItem{Text("View2")}
Text("View3").tabItem{Text("View3")}
View4().tabItem{Text("View4")}
}
}
}
struct View4: View {
#EnvironmentObject var viewModel: ViewModel
var body: some View {
NavigationView {
NavigationLink(destination: EditView().environmentObject(viewModel)){
Text("Edit")
}
}
}
}
struct EditView: View {
#EnvironmentObject var viewModel: ViewModel
var body: some View {
if viewModel.value != "" { // <-- here no error
Text(viewModel.value) // <-- here viewModel.value is a String
}
}
}
struct LoginView: View {
#EnvironmentObject var viewModel: ViewModel
var body: some View {
Button("Click me", action: {
viewModel.userSession = "something" // <-- to trigger the if in ContentView
viewModel.value = "testing-4-5-6" // <-- here change the value
})
}
}
Try this code and let us know if you get the error you show.