91 lines
2.9 KiB
Swift
91 lines
2.9 KiB
Swift
//
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// ContentView.swift
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// Leganto
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//
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// Created by Louis Hollingworth on 2023-05-21.
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//
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import SwiftUI
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import CoreData
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struct ContentView: View {
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@Environment(\.managedObjectContext) private var viewContext
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@FetchRequest(
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sortDescriptors: [NSSortDescriptor(keyPath: \Item.timestamp, ascending: true)],
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animation: .default)
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private var items: FetchedResults<Item>
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var body: some View {
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NavigationView {
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List {
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ForEach(items) { item in
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NavigationLink {
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Text("Item at \(item.timestamp!, formatter: itemFormatter)")
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} label: {
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Text(item.timestamp!, formatter: itemFormatter)
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}
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}
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.onDelete(perform: deleteItems)
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}
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.toolbar {
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#if os(iOS)
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ToolbarItem(placement: .navigationBarTrailing) {
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EditButton()
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}
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#endif
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ToolbarItem {
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Button(action: addItem) {
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Label("Add Item", systemImage: "plus")
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}
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}
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}
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Text("Select an item")
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}
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}
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private func addItem() {
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withAnimation {
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let newItem = Item(context: viewContext)
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newItem.timestamp = Date()
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do {
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try viewContext.save()
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} catch {
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// Replace this implementation with code to handle the error appropriately.
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// 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.
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let nsError = error as NSError
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fatalError("Unresolved error \(nsError), \(nsError.userInfo)")
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}
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}
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}
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private func deleteItems(offsets: IndexSet) {
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withAnimation {
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offsets.map { items[$0] }.forEach(viewContext.delete)
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do {
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try viewContext.save()
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} catch {
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// Replace this implementation with code to handle the error appropriately.
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// 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.
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let nsError = error as NSError
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fatalError("Unresolved error \(nsError), \(nsError.userInfo)")
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}
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}
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}
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}
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private let itemFormatter: DateFormatter = {
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let formatter = DateFormatter()
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formatter.dateStyle = .short
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formatter.timeStyle = .medium
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return formatter
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}()
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struct ContentView_Previews: PreviewProvider {
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static var previews: some View {
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ContentView().environment(\.managedObjectContext, PersistenceController.preview.container.viewContext)
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}
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}
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