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annotate Simoleon/UI/FavoriteButton.swift @ 160:0c589138a6f3

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Implement Conversion Box
author Dennis Concepcion Martin <dennisconcepcionmartin@gmail.com>
date Sun, 29 Aug 2021 19:04:34 +0100
parents 82bd84c5973c
children 3913aff613e8
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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 @ObservedObject var currencyPair: CurrencyPair
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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 var body: some View {
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17 Button(action: {
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18 animate()
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19 if isFavorite() {
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20 remove()
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21 } else {
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22 add()
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23 }
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24 }) {
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25 RoundedRectangle(cornerRadius: 15)
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26 .foregroundColor(Color(.secondarySystemBackground))
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27 .frame(width: 60, height: 60)
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28 .overlay(
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29 VStack {
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30 if isFavorite() {
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31 Image(systemName: "star.fill")
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32 } else {
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33 Image(systemName: "star")
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34 }
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35 }
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36 .font(.system(size: 28))
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37 .foregroundColor(Color(.systemYellow))
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38 )
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39 }
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40 .scaleEffect(scale)
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41 .animation(.linear(duration: 0.2), value: scale)
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42 }
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43
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44 func add() {
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45 let favoritePair = FavoritePair(context: viewContext)
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46 favoritePair.baseSymbol = currencyPair.baseSymbol
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47 favoritePair.quoteSymbol = currencyPair.quoteSymbol
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49 do {
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50 try viewContext.save()
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51 } catch {
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52 let nsError = error as NSError
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53 fatalError("Unresolved error \(nsError), \(nsError.userInfo)")
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54 }
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55 }
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57 func remove() {
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58 let favoritePair = favoritePairs.first(
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59 where: {
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60 $0.baseSymbol == currencyPair.baseSymbol && $0.quoteSymbol == currencyPair.quoteSymbol
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61 })
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63 viewContext.delete(favoritePair!)
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65 do {
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66 try viewContext.save()
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67 } catch {
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68 let nsError = error as NSError
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69 fatalError("Unresolved error \(nsError), \(nsError.userInfo)")
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70 }
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71 }
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72
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73 func isFavorite() -> Bool {
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74 let favoritePair = favoritePairs.first(
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75 where: {
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76 $0.baseSymbol == currencyPair.baseSymbol && $0.quoteSymbol == currencyPair.quoteSymbol
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77 })
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79 guard let _ = favoritePair else { return false }
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81 return true
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82 }
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83
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84 private func animate() {
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85 scale += 0.2
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86 DispatchQueue.main.asyncAfter(deadline: .now() + 0.2) {
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87 scale -= 0.2
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88 }
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89 }
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90 }
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92 struct FavoriteButton_Previews: PreviewProvider {
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93 static var previews: some View {
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94 FavoriteButton(currencyPair: CurrencyPair())
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95 }
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96 }