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annotate Simoleon/Helpers/FavouriteButton.swift @ 47:75c1a05176f6

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Refactor code
author Dennis Concepción Martín <dennisconcepcionmartin@gmail.com>
date Mon, 26 Jul 2021 20:08:20 +0100
parents d25b02d439d4
children 7a6a7c677851
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1 //
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2 // FavouriteButton.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 FavouriteButton: View {
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11 var currencyPair: String
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13 @State private var starSymbol = "star"
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14 @Environment(\.managedObjectContext) private var viewContext
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15 @FetchRequest(sortDescriptors: []) private var favourite: FetchedResults<Favourite>
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17 var body: some View {
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18 let favouriteCurrencyPairs = favourite.map { $0.currencyPair }
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19 Button(action: { favouriteAction(favouriteCurrencyPairs) }) {
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20 RoundedRectangle(cornerRadius: 15)
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21 .foregroundColor(Color(.secondarySystemBackground))
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22 .frame(width: 60, height: 60)
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23 .overlay(
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24 Image(systemName: generateStar(favouriteCurrencyPairs))
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25 .font(.system(size: 28))
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26 .foregroundColor(Color(.systemYellow))
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27 )
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28 }
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29 }
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31 /*
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32 If currency pair is favourite:
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33 * Button action is to remove from favourites
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34 else:
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35 * Button action is to add to favourites
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36 */
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37 private func favouriteAction(_ favouriteCurrencyPairs: [String]) {
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38 if favouriteCurrencyPairs.contains(currencyPair) {
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39 removeFromFavourites()
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40 } else {
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41 addToFavourites()
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42 }
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44 simpleSuccess()
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45 }
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47 /*
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48 if currency pair is favourite:
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49 * Return "star.fill" symbol
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50 else:
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51 * Return "star"
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52 */
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53 private func generateStar(_ favouriteCurrencyPairs: [String]) -> String {
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54 if favouriteCurrencyPairs.contains(currencyPair) {
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55 return "star.fill"
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56 } else {
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57 return "star"
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58 }
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59 }
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61 /*
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62 * Get first favourite core data object that matches the specified currency pair
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63 * Delete it
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64 */
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65 private func removeFromFavourites() {
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66 withAnimation {
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67 let favouriteObject = favourite.first(where: { $0.currencyPair == currencyPair })
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68 viewContext.delete(favouriteObject ?? Favourite())
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69
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70 do {
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71 try viewContext.save()
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72 } catch {
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73 let nsError = error as NSError
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74 fatalError("Unresolved error \(nsError), \(nsError.userInfo)")
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75 }
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76 }
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77 }
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78
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79 /*
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80 * Create a favourite core data object
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81 * Save it
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82 */
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83 private func addToFavourites() {
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84 withAnimation {
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85 let favourite = Favourite(context: viewContext)
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86 favourite.currencyPair = currencyPair
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87
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88 do {
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89 try viewContext.save()
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90 } catch {
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91 let nsError = error as NSError
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92 fatalError("Unresolved error \(nsError), \(nsError.userInfo)")
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93 }
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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 struct FavouriteButton_Previews: PreviewProvider {
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99 static var previews: some View {
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100 FavouriteButton(currencyPair: "USD/GBP")
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101 }
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102 }