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annotate Simoleon/FavoritesView.swift @ 189:9f044d33d8ac 2.0.0

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add merge policy
author Dennis Concepcion Martin <dennisconcepcionmartin@gmail.com>
date Thu, 23 Dec 2021 16:43:00 +0100
parents 13d5a8deb6c2
children
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Dennis Concepcion Martin <dennisconcepcionmartin@gmail.com>
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1 //
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2 // FavoritesView.swift
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3 // Simoleon
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4 //
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5 // Created by Dennis Concepción Martín on 23/12/21.
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6 //
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7
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8 import SwiftUI
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9 import CoreData
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10
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11 struct FavoritesView: View {
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12 @Environment(\.managedObjectContext) private var viewContext
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13 @FetchRequest(
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14 sortDescriptors: [NSSortDescriptor(keyPath: \FavoritePair.baseCurrency, ascending: true)], animation: .default
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15 ) private var favoritePairs: FetchedResults<FavoritePair>
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16
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17 var body: some View {
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18 VStack {
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19 if favoritePairs.isEmpty {
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20 FavoritesPlaceholder()
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21 } else {
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22 List {
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23 ForEach(favoritePairs, id:\.self) { favoritePair in
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24 FavoriteRow(baseCurrency: favoritePair.baseCurrency!, quoteCurrency: favoritePair.quoteCurrency!)
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25 }
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26 .onDelete(perform: remove)
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27 }
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28 }
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29 }
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30 .toolbar {
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31 #if os(iOS)
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32 EditButton()
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33 #endif
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34 }
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35 .navigationTitle("Favorites")
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36 .if(UIDevice.current.userInterfaceIdiom == .phone) { content in
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37 NavigationView { content }
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38 }
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39 }
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40
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41 // Remove favorite pair from favorites
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42 private func remove(offsets: IndexSet) {
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43 withAnimation {
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44 offsets.map { favoritePairs[$0] }.forEach(viewContext.delete)
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45
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46 do {
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47 try viewContext.save()
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48 } catch {
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49 let nsError = error as NSError
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50 fatalError("Unresolved error \(nsError), \(nsError.userInfo)")
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51 }
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52 }
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53 }
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54 }
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55
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56 struct FavoritesView_Previews: PreviewProvider {
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57 static var previews: some View {
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58 FavoritesView()
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59 }
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60 }