I've been digging through the apple docs for a way to open a View from a NavigationLink where the SideBar is collapsed by default.
Everything I've tried leaves the side bar visible (but collapsible by pressing the sidebar button). I would like the default behaviour to be that the SideBar is not visible.
Does anyone have any suggestions on how to achieve this?
Thanks,
Andrew
Can you show your latest code?
Here's some base code (slightly modified boiler plate). At the moment, selecting the item just opens the detail view in the right column. I want the sidebar (left column) to slide away as soon as I select an item.
import CoreData
struct DetailView: View {
@Environment(\.managedObjectContext) private var viewContext
@ObservedObject var item: Item
func save() {
do {
try viewContext.save()
} catch {
var nserror = error as NSError
fatalError("Unresolved error: \(nserror)")
}
}
var body: some View {
Text("Item timestamp: \(item.timestamp!)")
Button(action: {
item.setElement(data: item.values!, row: 0, col: 2, val: item.getElement(data: item.values!, row: 0, col: 2) + 1)
save()
}) {
Text("Add one")
}
}
}
struct ContentView: View {
@Environment(\.managedObjectContext) private var viewContext
@FetchRequest(
sortDescriptors: [NSSortDescriptor(keyPath: \Item.timestamp, ascending: true)],
animation: .default)
private var items: FetchedResults<Item>
var body: some View {
NavigationView {
List {
ForEach(items) { item in
NavigationLink(destination: DetailView(item: item)) {
Text("Item at \(item.timestamp!, formatter: itemFormatter)")
}
}
.onDelete(perform: deleteItems)
}
.toolbar {
#if os(iOS)
ToolbarItem(placement: .bottomBar) {
EditButton()
}
#endif
ToolbarItem(placement: .primaryAction) {
Button(action: addItem) {
Label("Add Item", systemImage: "plus")
}
}
}
}
}
/*
let value: [Int16] = [1, Int16.max, Int16.min]
let data = Data(fromArray: value)
print(data as NSData) // <0100ff7f 0080>
let roundtrip = data.toArray(type: Int16.self)
print(roundtrip) // [1, 32767, -32768]
*/
private func addItem() {
withAnimation {
let newItem = Item(context: viewContext)
newItem.timestamp = Date()
do {
try viewContext.save()
} catch {
// Replace this implementation with code to handle the error appropriately.
// fatalError() causes the application to generate a crash log and terminate. You should not use this function in a shipping application, although it may be useful during development.
let nsError = error as NSError
fatalError("Unresolved error \(nsError), \(nsError.userInfo)")
}
}
}
private func deleteItems(offsets: IndexSet) {
withAnimation {
offsets.map { items[$0] }.forEach(viewContext.delete)
do {
try viewContext.save()
} catch {
// Replace this implementation with code to handle the error appropriately.
// fatalError() causes the application to generate a crash log and terminate. You should not use this function in a shipping application, although it may be useful during development.
let nsError = error as NSError
fatalError("Unresolved error \(nsError), \(nsError.userInfo)")
}
}
}
}
private let itemFormatter: DateFormatter = {
let formatter = DateFormatter()
formatter.dateStyle = .short
formatter.timeStyle = .medium
return formatter
}()
struct ContentView_Previews: PreviewProvider {
static var previews: some View {
ContentView().environment(\.managedObjectContext, PersistenceController.preview.container.viewContext)
}
}
Sorry for the late response. With lacking Item or some other parts, I needed to find some chance I could spend plenty of time.
Only iPad.
Have you tried adding navigationViewStyle?
NavigationView {
//...
}
.navigationViewStyle(StackNavigationViewStyle())