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annotate Simoleon/UI/FavoriteButton.swift @ 157:8c3bbd640103

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Implement Currency Selector
author Dennis Concepcion Martin <dennisconcepcionmartin@gmail.com>
date Sat, 28 Aug 2021 11:15:41 +0100
parents 84137052813d
children 82bd84c5973c
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1 //
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2 // FavoriteButton.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 FavoriteButton: View {
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11 @State var currencyPair: CurrencyPairModel
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12 @Environment(\.managedObjectContext) private var viewContext
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13 @FetchRequest(sortDescriptors: []) private var favorites: FetchedResults<Favorite>
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14 @State private var starSymbol = "star"
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15
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16 var body: some View {
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17 Button(action: favoriteAction) {
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18 RoundedRectangle(cornerRadius: 15)
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19 .foregroundColor(Color(.secondarySystemBackground))
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20 .frame(width: 60, height: 60)
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21 .overlay(
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22 Image(systemName: generateStar())
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23 .font(.system(size: 28))
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24 .foregroundColor(Color(.systemYellow))
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25 )
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26 }
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27 .accessibilityIdentifier("AddToFavorites")
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28 }
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30 /*
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31 If currency pair is favorite:
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32 * Button action is to remove from favorites
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33 else:
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34 * Button action is to add to favorites
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35 */
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36 private func favoriteAction() {
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37 let favoriteCurrencyPairs = favorites.map { $0.currencyPair }
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38 let currencyPair = "(\(currencyPair.baseSymbol)/\(currencyPair.quoteSymbol)"
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39 if favoriteCurrencyPairs.contains(currencyPair) {
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40 removeFromFavorites()
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41 } else {
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42 addToFavorites()
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43 }
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44
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45 let haptics = Haptics()
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46 haptics.simpleSuccess()
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47 }
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49 /*
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50 if currency pair is favorite:
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51 * Return "star.fill" symbol
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52 else:
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53 * Return "star"
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54 */
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55 private func generateStar() -> String {
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56 let favoriteCurrencyPairs = favorites.map { $0.currencyPair }
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57 let currencyPair = "(\(currencyPair.baseSymbol)/\(currencyPair.quoteSymbol)"
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58 if favoriteCurrencyPairs.contains(currencyPair) {
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59 return "star.fill"
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60 } else {
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61 return "star"
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62 }
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63 }
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65 /*
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66 * Get first favorite core data object that matches the specified currency pair
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67 * Delete it
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68 */
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69 private func removeFromFavorites() {
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70 let currencyPair = "(\(currencyPair.baseSymbol)/\(currencyPair.quoteSymbol)"
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71 withAnimation {
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72 let favoriteObject = favorites.first(where: { $0.currencyPair == currencyPair })
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73 viewContext.delete(favoriteObject ?? Favorite())
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74
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75 do {
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76 try viewContext.save()
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77 } catch {
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78 let nsError = error as NSError
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79 fatalError("Unresolved error \(nsError), \(nsError.userInfo)")
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80 }
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81 }
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82 }
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83
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84 /*
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85 * Create a favorite core data object
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86 * Save it
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87 */
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88 private func addToFavorites() {
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89 let currencyPair = "(\(currencyPair.baseSymbol)/\(currencyPair.quoteSymbol)"
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90 withAnimation {
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91 let favorite = Favorite(context: viewContext)
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92 favorite.currencyPair = currencyPair
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93
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94 do {
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95 try viewContext.save()
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96 } catch {
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97 let nsError = error as NSError
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98 fatalError("Unresolved error \(nsError), \(nsError.userInfo)")
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99 }
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100 }
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101 }
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102 }
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103
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104 struct FavoriteButton_Previews: PreviewProvider {
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105 static var previews: some View {
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106 FavoriteButton(currencyPair: CurrencyPairModel(baseSymbol: "USD", quoteSymbol: "EUR"))
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107 }
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108 }