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comparison LazyBear/ContentView.swift @ 164:f74a364441ca

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author Dennis Concepción Martín <66180929+denniscm190@users.noreply.github.com>
date Wed, 17 Feb 2021 20:27:04 +0100
parents LazyBear/LazyBear/ContentView.swift@9d519f230f26
children 125d268db489
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163:9d519f230f26 164:f74a364441ca
1 //
2 // ContentView.swift
3 // LazyBear
4 //
5 // Created by Dennis Concepción Martín on 17/2/21.
6 //
7
8 import SwiftUI
9 import CoreData
10
11 struct ContentView: View {
12 @Environment(\.managedObjectContext) private var viewContext
13
14 @FetchRequest(
15 sortDescriptors: [NSSortDescriptor(keyPath: \Item.timestamp, ascending: true)],
16 animation: .default)
17 private var items: FetchedResults<Item>
18
19 var body: some View {
20 List {
21 ForEach(items) { item in
22 Text("Item at \(item.timestamp!, formatter: itemFormatter)")
23 }
24 .onDelete(perform: deleteItems)
25 }
26 .toolbar {
27 #if os(iOS)
28 EditButton()
29 #endif
30
31 Button(action: addItem) {
32 Label("Add Item", systemImage: "plus")
33 }
34 }
35 }
36
37 private func addItem() {
38 withAnimation {
39 let newItem = Item(context: viewContext)
40 newItem.timestamp = Date()
41
42 do {
43 try viewContext.save()
44 } catch {
45 // Replace this implementation with code to handle the error appropriately.
46 // 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.
47 let nsError = error as NSError
48 fatalError("Unresolved error \(nsError), \(nsError.userInfo)")
49 }
50 }
51 }
52
53 private func deleteItems(offsets: IndexSet) {
54 withAnimation {
55 offsets.map { items[$0] }.forEach(viewContext.delete)
56
57 do {
58 try viewContext.save()
59 } catch {
60 // Replace this implementation with code to handle the error appropriately.
61 // 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.
62 let nsError = error as NSError
63 fatalError("Unresolved error \(nsError), \(nsError.userInfo)")
64 }
65 }
66 }
67 }
68
69 private let itemFormatter: DateFormatter = {
70 let formatter = DateFormatter()
71 formatter.dateStyle = .short
72 formatter.timeStyle = .medium
73 return formatter
74 }()
75
76 struct ContentView_Previews: PreviewProvider {
77 static var previews: some View {
78 ContentView().environment(\.managedObjectContext, PersistenceController.preview.container.viewContext)
79 }
80 }