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annotate Simoleon/Helpers/FavouriteButton.swift @ 26:337816652bfe

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Add haptics
author Dennis Concepción Martín <dennisconcepcionmartin@gmail.com>
date Tue, 20 Jul 2021 12:23:37 +0100
parents 3596690dda73
children d95582268b44
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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 simpleSuccess()
21
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20 } else {
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21 addToFavourites()
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22 simpleSuccess()
21
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23 }
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24 }) {
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25 RoundedRectangle(cornerRadius: 25)
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26 .foregroundColor(Color(.secondarySystemBackground))
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27 .frame(width: 65, height: 65)
21
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28 .overlay(
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29 Image(systemName: generateStar())
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30 .font(.system(size: 28))
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31 .foregroundColor(Color(.systemYellow))
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32
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33 )
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34 }
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35 }
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36
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37 private func isFavourite() -> Bool {
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38 let favouriteCurrencyPairs = favourite.map { $0.currencyPair }
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39
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40 if favouriteCurrencyPairs.contains(currencyPair) {
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41 return true
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42 } else {
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43 return false
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44 }
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45 }
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46
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47 private func generateStar() -> String {
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48 if isFavourite() {
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49 return "star.fill"
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50 } else {
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51 return "star"
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52 }
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53 }
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54
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55 private func removeFromFavourites() {
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56 withAnimation {
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57 let favouriteObject = favourite.first(where: { $0.currencyPair == currencyPair })
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58 viewContext.delete(favouriteObject ?? Favourite())
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59
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60 do {
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61 try viewContext.save()
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62 } catch {
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63 let nsError = error as NSError
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64 fatalError("Unresolved error \(nsError), \(nsError.userInfo)")
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65 }
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66 }
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67 }
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68
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69 private func addToFavourites() {
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70 withAnimation {
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71 let favourite = Favourite(context: viewContext)
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72 favourite.currencyPair = currencyPair
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73
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74 do {
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75 try viewContext.save()
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76 } catch {
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77 let nsError = error as NSError
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78 fatalError("Unresolved error \(nsError), \(nsError.userInfo)")
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79 }
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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 struct FavouriteButton_Previews: PreviewProvider {
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85 static var previews: some View {
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86 FavouriteButton(currencyPair: "USD/GBP")
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87 }
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88 }