Below is my sample code. On the Home page, when I click "show sheet," the sheet page expands, and the StateObject inside the sheet is initialized once. However, when I click "show Fullscreen" and then click "show sheet" inside the fullscreen page, the sheet gets initialized twice.
However, if I remove navigationDestination, this issue does not occur.
This problem causes the network request in the sheet page to be triggered multiple times.
Can someone tell me the reason?
enum TestRouter: String, Hashable {
case test
var targetView: some View {
Text("test")
}
var title: String {
return "test title"
}
}
@MainActor
struct NavigationInnerView<Content>: View where Content: View {
var contentView: () -> Content
@MainActor public init(@ViewBuilder contentView: @escaping () -> Content) {
self.contentView = contentView
}
var body: some View {
NavigationStack() {
contentView()
.navigationDestination(for: TestRouter.self) { route in
route.targetView
}
}
.navigationViewStyle(StackNavigationViewStyle())
}
}
struct ContentView: View {
@State var showFullScreen: Bool = false
@State var showSheet: Bool = false
var contentView: some View {
VStack {
VStack {
Text("Home")
Button {
showFullScreen = true
} label: {
Text("show fullscreen")
}
Button {
showSheet = true
} label: {
Text("show sheet ")
}
}
}
}
var body: some View {
NavigationInnerView {
contentView
.fullScreenCover(isPresented: $showFullScreen) {
NavigationInnerView {
FullScreenContentView()
}
}
.sheet(isPresented: $showSheet) {
NavigationInnerView {
SheetContentView()
}
}
}
}
}
class FullScreenViewModel: ObservableObject {
@Published var content: Bool = false
init() {
print("Full Screen ViewModel init")
}
}
struct FullScreenContentView: View {
@Environment(\.dismiss) var dismiss
@State var showSheet: Bool = false
@StateObject var viewModel: FullScreenViewModel = .init()
init() {
print("Full screen view init")
}
var body: some View {
VStack {
Text("FullScreen")
Button {
dismiss()
}label: {
Text("dismiss")
}
Button {
showSheet = true
} label: {
Text("show sheet")
}
}
.sheet(isPresented: $showSheet) {
NavigationInnerView {
SheetContentView()
}
}
}
}
class SheetViewModel: ObservableObject {
@Published var content: Bool = false
init() {
print("SheetViewModel init")
}
}
struct SheetContentView: View {
@Environment(\.dismiss) var dismiss
@StateObject var viewModel = SheetViewModel()
init() {
print("sheet view init")
}
var body: some View {
Text("Sheet")
Button {
dismiss()
} label: {
Text("dismiss")
}
}
}
#Preview {
ContentView()
}
zkhCreator
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