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annotate Simoleon/FavoritesView.swift @ 166:e4cbb1eea394

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Implement FavoritesView
author Dennis Concepcion Martin <dennisconcepcionmartin@gmail.com>
date Sat, 11 Sep 2021 16:30:32 +0200
parents 84137052813d
children
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1 //
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2 // FavoritesView.swift
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3 // Simoleon
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4 //
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5 // Created by Dennis Concepción Martín on 19/07/2021.
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6 //
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7
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8 import SwiftUI
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9
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10 struct FavoritesView: View {
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11 @Environment(\.managedObjectContext) private var viewContext
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12 @FetchRequest(
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13 sortDescriptors: [NSSortDescriptor(keyPath: \FavoritePair.baseSymbol, ascending: true)],
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14 animation: .default)
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15 private var favoritePairs: FetchedResults<FavoritePair>
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16
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17 var body: some View {
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18 VStack {
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19 if favoritePairs.isEmpty {
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20 FavoritesPlaceholder()
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21 } else {
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22 List {
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23 ForEach(favoritePairs, id:\.self) { favoritePair in
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24 FavoritePairRow(favoritePair: favoritePair)
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25 .padding(.vertical, 4)
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26 }
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27 .onDelete(perform: removeFromFavorites)
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28 }
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29 .listStyle(InsetGroupedListStyle())
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30 }
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31 }
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32 .navigationTitle("Favorites")
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33 .toolbar {
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34 #if os(iOS)
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35 EditButton()
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36 #endif
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37 }
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38 .if(UIDevice.current.userInterfaceIdiom == .phone) { content in
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39 NavigationView { content }
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40 }
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41 .onAppear {
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42 #if SCREENSHOTS
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43 generateFavoritesForScreenshots()
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44 #endif
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45 }
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46 }
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47
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48 private func removeFromFavorites(offsets: IndexSet) {
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49 withAnimation {
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50 offsets.map { favoritePairs[$0] }.forEach(viewContext.delete)
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51
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52 do {
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53 try viewContext.save()
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54 } catch {
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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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60
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61 #if SCREENSHOTS
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62 /*
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63 Save currencies to favourites to take screenshots for the App Store
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64 */
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65 private func generateFavoritesForScreenshots() {
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66 let pairs = ["EUR/USD", "BTC/USD", "USD/HKD", "USD/JPY", "AUD/USD",
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67 "XAU/GBP", "DASH/ETH", "EUR/USD", "XAG/CAD"]
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68
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69 for pair in pairs {
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70 let symbols = pair.components(separatedBy: "/")
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71 let favoritePair = favoritePairs.first(
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72 where: {
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73 $0.baseSymbol == symbols[0] && $0.quoteSymbol == symbols[1]
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74 })
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75
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76 if let _ = favoritePair {
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77 // Do not save to core data again
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78 } else {
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79 let favoritePair = FavoritePair(context: viewContext)
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80 favoritePair.baseSymbol = symbols[0]
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81 favoritePair.quoteSymbol = symbols[1]
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82 }
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83
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84 do {
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85 try viewContext.save()
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86 } catch {
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87 let nsError = error as NSError
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88 fatalError("Unresolved error \(nsError), \(nsError.userInfo)")
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89 }
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90 }
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91 }
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92 #endif
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93 }
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94
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95 struct FavoritesView_Previews: PreviewProvider {
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96 static var previews: some View {
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97 FavoritesView()
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98 .environment(\.managedObjectContext, PersistenceController.preview.container.viewContext)
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99 }
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100 }