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annotate Simoleon/Helpers/FavouriteButton.swift @ 21:c3dda63f50ed v1.1

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Added Core Data and UI changes - Implement Watchlist - Change conversion design - Improve UX
author Dennis Concepción Martín <dennisconcepcionmartin@gmail.com>
date Mon, 19 Jul 2021 19:27:12 +0100
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children 3596690dda73
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21
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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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12 @Environment(\.managedObjectContext) private var viewContext
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13 @FetchRequest(sortDescriptors: []) private var favourite: FetchedResults<Favourite>
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14
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15 var body: some View {
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16 Button(action: {
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17 if isFavourite() {
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18 removeFromFavourites()
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19 } else {
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20 addToFavourites()
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21 }
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22 }) {
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23 RoundedRectangle(cornerRadius: 25)
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24 .foregroundColor(Color(.secondarySystemBackground))
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25 .frame(width: 75, height: 75)
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26 .overlay(
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27 Image(systemName: generateStar())
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28 .font(.system(size: 28))
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29 .foregroundColor(Color(.systemYellow))
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30
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31 )
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32 }
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33 }
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34
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35 private func isFavourite() -> Bool {
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36 let favouriteCurrencyPairs = favourite.map { $0.currencyPair }
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37
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38 if favouriteCurrencyPairs.contains(currencyPair) {
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39 return true
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40 } else {
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41 return false
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42 }
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43 }
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44
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45 private func generateStar() -> String {
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46 if isFavourite() {
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47 return "star.fill"
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48 } else {
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49 return "star"
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50 }
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51 }
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52
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53 private func removeFromFavourites() {
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54 withAnimation {
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55 let favouriteObject = favourite.first(where: { $0.currencyPair == currencyPair })
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56 viewContext.delete(favouriteObject ?? Favourite())
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57
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58 do {
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59 try viewContext.save()
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60 } catch {
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61 let nsError = error as NSError
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62 fatalError("Unresolved error \(nsError), \(nsError.userInfo)")
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63 }
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64 }
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65 }
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66
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67 private func addToFavourites() {
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68 withAnimation {
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69 let favourite = Favourite(context: viewContext)
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70 favourite.currencyPair = currencyPair
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71
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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 struct FavouriteButton_Previews: PreviewProvider {
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83 static var previews: some View {
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84 FavouriteButton(currencyPair: "USD/GBP")
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85 }
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86 }