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annotate LazyBear/ContentView.swift @ 463:783b567800d9

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author Dennis Concepción Martín <dennisconcepcionmartin@gmail.com>
date Sat, 17 Jul 2021 09:33:26 +0100
parents c6913f0ce46e
children 6953d83060a4
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1 //
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2 // ContentView.swift
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3 // lazybear
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4 //
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5 // Created by Dennis Concepción Martín on 17/07/2021.
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6 //
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7
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8 import SwiftUI
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9 import CoreData
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10
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11 struct ContentView: View {
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12 @Environment(\.managedObjectContext) private var viewContext
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13
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14 @FetchRequest(
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15 sortDescriptors: [NSSortDescriptor(keyPath: \Item.timestamp, ascending: true)],
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16 animation: .default)
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17 private var items: FetchedResults<Item>
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18
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19 var body: some View {
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20 List {
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21 ForEach(items) { item in
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22 Text("Item at \(item.timestamp!, formatter: itemFormatter)")
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23 }
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24 .onDelete(perform: deleteItems)
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25 }
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26 .toolbar {
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27 #if os(iOS)
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28 EditButton()
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29 #endif
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30
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31 Button(action: addItem) {
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32 Label("Add Item", systemImage: "plus")
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33 }
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34 }
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35 }
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36
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37 private func addItem() {
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38 withAnimation {
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39 let newItem = Item(context: viewContext)
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40 newItem.timestamp = Date()
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41
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42 do {
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43 try viewContext.save()
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44 } catch {
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45 // Replace this implementation with code to handle the error appropriately.
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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.
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47 let nsError = error as NSError
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48 fatalError("Unresolved error \(nsError), \(nsError.userInfo)")
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49 }
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50 }
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51 }
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52
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53 private func deleteItems(offsets: IndexSet) {
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54 withAnimation {
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55 offsets.map { items[$0] }.forEach(viewContext.delete)
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56
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57 do {
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58 try viewContext.save()
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59 } catch {
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60 // Replace this implementation with code to handle the error appropriately.
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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.
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62 let nsError = error as NSError
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63 fatalError("Unresolved error \(nsError), \(nsError.userInfo)")
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64 }
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65 }
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66 }
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67 }
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69 private let itemFormatter: DateFormatter = {
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70 let formatter = DateFormatter()
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71 formatter.dateStyle = .short
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72 formatter.timeStyle = .medium
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73 return formatter
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74 }()
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76 struct ContentView_Previews: PreviewProvider {
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77 static var previews: some View {
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78 ContentView().environment(\.managedObjectContext, PersistenceController.preview.container.viewContext)
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79 }
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80 }