The code below presents a number of 'event' items in a from. Each item can be deleted or clicked on to navugate to a different view:

private func addDetails() -> some View {
        Form {

            Section(header: Text("Events").font(.headline)) {
                ForEach(eventArray, id: \.self) { event in
                    NavigationLink(destination: EventDetailView(event: event)) {
                        HTextPair(labelText: event.wrappedType,
                                  valueText: event.formattedDate)
                    }
                }.onDelete(perform: deleteEvent)
          }
    }

I would like to prevent deletion of events unless the user has clicked on a custom 'Edit/Done' button on the navigation bar which simply toggles a boolean flag isEditing. I believe that the following code should work:

private func addDetails() -> some View {
    Form {

        Section(header: Text("Events").font(.headline)) {
            if isEditing {
                ForEach(eventArray, id: \.self) { event in
                    NavigationLink(destination: EventDetailView(event: event)) {
                        HTextPair(labelText: event.wrappedType,
                              valueText: event.formattedDate)
                    }
                }.onDelete(perform: deleteEvent)
            } else {
                ForEach(eventArray, id: \.self) { event in
                    NavigationLink(destination: EventDetailView(event: event)) {
                        HTextPair(labelText: event.wrappedType,
                                  valueText: event.formattedDate)
                    }
                } 
            }
        }
    }
}

With this revised version the everythin works as expected when isEditing == false . When isEditing == true navigation no longer works and only the last item becomes deletable.

I have also tried placing the items inside a List but that does not render correctly - the List takes up a single line. Is there a better way to conditionally enable/disable delete for each item?

Thanks - that has solved the problem but I still don't understand the cause of the unexpected behaviour..

My gut feel is that SwiftUI is very buggy and possible requires anoth 18months development by Apple before it is suitable for creating anything more complex than a simple UI. A lotsof things do not work as expected and require work arounds. I found that if I place I show an ImagePicker sheet over a Form which has a small MapView as one of its elements, the program crashes with a Thread 1: EXC_BAD_INSTRUCTION (code=EXC_I386_INVOP, subcode=0x0) the fix is to load the ImagePicker from a different pane.

Currently I am having another issue with applying my isEditing flag in a view. This time it is to enable or disable a 'NavigationLink'

            VStack(alignment: .leading) {

                NavigationLink(destination: AddEventAttributeView(
                viewModel: viewModel, candidate: event)) {
                    Text("Add Attribute")
                }//.disabled(!isEditing)

            }
            //.disabled(!isEditing)

If I uncomment either of the ,disabled(!isEditing) line in the above code the link changes appearance for active / inactive but has no affect. With the line commented out the link works but I do not want to allow modification unless the user is editing.