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annotate Simoleon/Helpers/FavoriteButton.swift @ 150:6eac99e99b96

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Add error handling to read json function
author Dennis Concepcion Martin <dennisconcepcionmartin@gmail.com>
date Thu, 19 Aug 2021 19:12:56 +0100
parents 081f0857af51
children
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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 var currencyPair: String
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13 @Environment(\.managedObjectContext) private var viewContext
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14 @FetchRequest(sortDescriptors: []) private var favorites: FetchedResults<Favorite>
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16 @State private var starSymbol = "star"
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17
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18 var body: some View {
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19 let favoriteCurrencyPairs = favorites.map { $0.currencyPair }
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20 Button(action: { favoriteAction(favoriteCurrencyPairs) }) {
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21 RoundedRectangle(cornerRadius: 15)
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22 .foregroundColor(Color(.secondarySystemBackground))
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23 .frame(width: 60, height: 60)
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24 .overlay(
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25 Image(systemName: generateStar(favoriteCurrencyPairs))
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26 .font(.system(size: 28))
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27 .foregroundColor(Color(.systemYellow))
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28 )
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29 }
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30 .accessibilityIdentifier("AddToFavorites")
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31 }
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33 /*
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34 If currency pair is favorite:
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35 * Button action is to remove from favorites
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36 else:
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37 * Button action is to add to favorites
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38 */
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39 private func favoriteAction(_ favoriteCurrencyPairs: [String]) {
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40 if favoriteCurrencyPairs.contains(currencyPair) {
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41 removeFromFavorites()
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42 } else {
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43 addToFavorites()
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44 }
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46 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(_ favoriteCurrencyPairs: [String]) -> String {
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56 if favoriteCurrencyPairs.contains(currencyPair) {
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57 return "star.fill"
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58 } else {
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59 return "star"
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60 }
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61 }
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63 /*
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64 * Get first favorite core data object that matches the specified currency pair
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65 * Delete it
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66 */
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67 private func removeFromFavorites() {
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68 withAnimation {
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69 let favoriteObject = favorites.first(where: { $0.currencyPair == currencyPair })
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70 viewContext.delete(favoriteObject ?? Favorite())
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72 do {
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73 try viewContext.save()
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74 } catch {
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75 let nsError = error as NSError
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76 fatalError("Unresolved error \(nsError), \(nsError.userInfo)")
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77 }
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78 }
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79 }
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80
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81 /*
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82 * Create a favorite core data object
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83 * Save it
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84 */
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85 private func addToFavorites() {
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86 withAnimation {
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87 let favorite = Favorite(context: viewContext)
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88 favorite.currencyPair = currencyPair
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90 do {
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91 try viewContext.save()
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92 } catch {
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93 let nsError = error as NSError
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94 fatalError("Unresolved error \(nsError), \(nsError.userInfo)")
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95 }
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96 }
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97 }
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98 }
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100 struct FavoriteButton_Previews: PreviewProvider {
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101 static var previews: some View {
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102 FavoriteButton(currencyPair: "USD/GBP")
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103 }
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104 }