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annotate Simoleon/UI/FavoriteButton.swift @ 166:e4cbb1eea394

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Implement FavoritesView
author Dennis Concepcion Martin <dennisconcepcionmartin@gmail.com>
date Sat, 11 Sep 2021 16:30:32 +0200
parents f5de15e06c77
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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10 struct FavoriteButton: View {
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11 @ObservedObject var currencyConversion: CurrencyConversion
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12 @State private var scale: CGFloat = 1
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13 @Environment(\.managedObjectContext) private var viewContext
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14 @FetchRequest(sortDescriptors: []) private var favoritePairs: FetchedResults<FavoritePair>
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16 let hapticsHelper = HapticsHelper()
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18 var body: some View {
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19 Button(action: {
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20 animate()
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21 if isFavorite() {
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22 remove()
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23 } else {
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24 add()
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25 }
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27 hapticsHelper.simpleSuccess()
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28 }) {
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29 RoundedRectangle(cornerRadius: 15)
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30 .foregroundColor(Color(.secondarySystemBackground))
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31 .frame(width: 60, height: 60)
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32 .overlay(
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33 VStack {
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34 if isFavorite() {
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35 Image(systemName: "star.fill")
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36 } else {
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37 Image(systemName: "star")
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38 }
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39 }
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40 .font(.system(size: 28))
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41 .foregroundColor(Color(.systemYellow))
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42 )
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43 }
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44 .scaleEffect(scale)
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45 .animation(.linear(duration: 0.2), value: scale)
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46 }
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48 func add() {
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49 let favoritePair = FavoritePair(context: viewContext)
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50 favoritePair.baseSymbol = currencyConversion.baseSymbol
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51 favoritePair.quoteSymbol = currencyConversion.quoteSymbol
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53 do {
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54 try viewContext.save()
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55 } catch {
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56 let nsError = error as NSError
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57 fatalError("Unresolved error \(nsError), \(nsError.userInfo)")
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58 }
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59 }
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60
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61 func remove() {
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62 let favoritePair = favoritePairs.first(
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63 where: {
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64 $0.baseSymbol == currencyConversion.baseSymbol && $0.quoteSymbol == currencyConversion.quoteSymbol
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65 })
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67 viewContext.delete(favoritePair!)
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69 do {
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70 try viewContext.save()
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71 } catch {
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72 let nsError = error as NSError
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73 fatalError("Unresolved error \(nsError), \(nsError.userInfo)")
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74 }
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75 }
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76
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77 func isFavorite() -> Bool {
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78 let favoritePair = favoritePairs.first(
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79 where: {
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80 $0.baseSymbol == currencyConversion.baseSymbol && $0.quoteSymbol == currencyConversion.quoteSymbol
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81 })
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83 guard let _ = favoritePair else { return false }
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85 return true
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86 }
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88 private func animate() {
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89 scale += 0.2
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90 DispatchQueue.main.asyncAfter(deadline: .now() + 0.2) {
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91 scale -= 0.2
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92 }
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93 }
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94 }
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96 struct FavoriteButton_Previews: PreviewProvider {
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97 static var previews: some View {
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98 FavoriteButton(currencyConversion: CurrencyConversion())
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99 }
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100 }