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annotate Simoleon/ContentView.swift @ 182:ba3ebe8cefe5

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refactor code
author Dennis Concepcion Martin <dennisconcepcionmartin@gmail.com>
date Wed, 08 Dec 2021 10:58:15 +0100
parents 5a9430fd6b4d
children d2398f02e1ce
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1 //
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2 // ContentView.swift
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3 // Simoleon
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4 //
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5 // Created by Dennis Concepción Martín on 8/12/21.
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6 //
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8 import SwiftUI
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9 import CoreData
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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 NavigationView {
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21 List {
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22 ForEach(items) { item in
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23 NavigationLink {
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24 Text("Item at \(item.timestamp!, formatter: itemFormatter)")
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25 } label: {
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26 Text(item.timestamp!, formatter: itemFormatter)
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27 }
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28 }
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29 .onDelete(perform: deleteItems)
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30 }
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31 .toolbar {
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32 ToolbarItem(placement: .navigationBarTrailing) {
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33 EditButton()
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34 }
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35 ToolbarItem {
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36 Button(action: addItem) {
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37 Label("Add Item", systemImage: "plus")
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38 }
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39 }
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40 }
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41 Text("Select an item")
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42 }
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43 }
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45 private func addItem() {
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46 withAnimation {
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47 let newItem = Item(context: viewContext)
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48 newItem.timestamp = Date()
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49
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50 do {
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51 try viewContext.save()
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52 } catch {
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53 // Replace this implementation with code to handle the error appropriately.
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54 // 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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55 let nsError = error as NSError
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56 fatalError("Unresolved error \(nsError), \(nsError.userInfo)")
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57 }
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58 }
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59 }
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61 private func deleteItems(offsets: IndexSet) {
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62 withAnimation {
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63 offsets.map { items[$0] }.forEach(viewContext.delete)
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64
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65 do {
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66 try viewContext.save()
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67 } catch {
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68 // Replace this implementation with code to handle the error appropriately.
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69 // 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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70 let nsError = error as NSError
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71 fatalError("Unresolved error \(nsError), \(nsError.userInfo)")
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72 }
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73 }
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74 }
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75 }
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76
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77 private let itemFormatter: DateFormatter = {
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78 let formatter = DateFormatter()
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79 formatter.dateStyle = .short
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80 formatter.timeStyle = .medium
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81 return formatter
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82 }()
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83
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84 struct ContentView_Previews: PreviewProvider {
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85 static var previews: some View {
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86 ContentView().environment(\.managedObjectContext, PersistenceController.preview.container.viewContext)
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87 }
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88 }