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)
}
}
