How should I code this `#ViewBuilder` function for conditional contextMenu? - swiftui

Question

Because the code for compositing context menu is a little lengthy, I want to code it like this:
var body: some View {
Text("Hello World")
.contextMenu(changingStatusID == nil ? contextMenu() : nil)
}
#ViewBuilder
func contextMenu() -> ContextMenu { //<-- Problem goes here, I don't know how to set the parameters and it's return type
ContextMenu {
Button {
edit()
} label: {
Label("Edit", systemImage: "rectangle.and.pencil.and.ellipsis")
}
Divider()
if #available(macOS 12.0, *) {
Button(role: .destructive) {
do {
try delete()
}
catch {
showAlert = true
}
} label: {
Label("Delete", systemImage: "trash")
}
.alert("Failed to delete.", isPresented: $showAlert) {
Button("OK", role: .cancel) { }
}
} else {
Button {
do {
try delete()
}
catch {
showAlert = true
}
} label: {
Label("Delete ⚠︎", systemImage: "trash")
}
.alert(isPresented: $showAlert) {
Alert(title: Text("Failed"),
message: Text("Unable to delete this task."),
dismissButton: .default(Text("OK")))
}
}
}
}
XCode shows error in the line of function name func contextMenu():
Cannot convert value of type 'ContextMenu<TupleView<(Button<Label<Text, Image>>, Divider, _ConditionalContent<AnyView, some View>)>>' to specified type '<<error type>>'
Reference to generic type 'ContextMenu' requires arguments in <...> Insert '<<#MenuItems: View#>>'
Static method 'buildBlock' requires that 'ContextMenu<TupleView<(Button<Label<Text, Image>>, Divider, _ConditionalContent<AnyView, some View>)>>' conform to 'View'

Answer 1

Here is an approach that works:
struct ContentView: View {
#State private var showContext = true
#State private var showAlert = false
var body: some View {
VStack {
Toggle("show contextMenu", isOn: $showContext)
Text("Hello World")
.contextMenu {
if showContext {
myContextMenu()
}
}
}
.padding()
}
#ViewBuilder
func myContextMenu() -> some View {
// ContextMenu { // not needed
Button {
//edit()
} label: {
Label("Edit", systemImage: "rectangle.and.pencil.and.ellipsis")
}
Divider()
Button(role: .destructive) {
do {
//try delete()
}
catch {
showAlert = true
}
} label: {
Label("Delete", systemImage: "trash")
}
.alert("Failed to delete.", isPresented: $showAlert) {
Button("OK", role: .cancel) { }
}
// }
}
}