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annotate Simoleon/Helpers/FavoriteButton.swift @ 53:b0bce2c8e4a9

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Refactor UK spelling to US
author Dennis Concepción Martín <dennisconcepcionmartin@gmail.com>
date Tue, 27 Jul 2021 09:44:51 +0100
parents Simoleon/Helpers/FavouriteButton.swift@7a6a7c677851
children 529feb1fc8d5 501ea028ea5e
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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 favorite: 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 = favorite.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 }
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32 /*
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33 If currency pair is favorite:
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34 * Button action is to remove from favorites
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35 else:
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36 * Button action is to add to favorites
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37 */
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38 private func favoriteAction(_ favoriteCurrencyPairs: [String]) {
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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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45 simpleSuccess()
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46 }
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48 /*
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49 if currency pair is favorite:
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50 * Return "star.fill" symbol
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51 else:
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52 * Return "star"
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53 */
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54 private func generateStar(_ favoriteCurrencyPairs: [String]) -> String {
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55 if favoriteCurrencyPairs.contains(currencyPair) {
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56 return "star.fill"
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57 } else {
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58 return "star"
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59 }
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60 }
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62 /*
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63 * Get first favorite core data object that matches the specified currency pair
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64 * Delete it
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65 */
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66 private func removeFromFavorites() {
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67 withAnimation {
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68 let favoriteObject = favorite.first(where: { $0.currencyPair == currencyPair })
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69 viewContext.delete(favoriteObject ?? Favorite())
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71 do {
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72 try viewContext.save()
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73 } catch {
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74 let nsError = error as NSError
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75 fatalError("Unresolved error \(nsError), \(nsError.userInfo)")
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76 }
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77 }
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78 }
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80 /*
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81 * Create a favorite core data object
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82 * Save it
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83 */
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84 private func addToFavorites() {
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85 withAnimation {
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86 let favorite = Favorite(context: viewContext)
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87 favorite.currencyPair = currencyPair
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89 do {
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90 try viewContext.save()
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91 } catch {
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92 let nsError = error as NSError
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93 fatalError("Unresolved error \(nsError), \(nsError.userInfo)")
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94 }
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95 }
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96 }
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97 }
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98
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99 struct FavoriteButton_Previews: PreviewProvider {
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100 static var previews: some View {
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101 FavoriteButton(currencyPair: "USD/GBP")
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102 }
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103 }