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annotate Simoleon/Favorites.swift @ 84:98852b65438c

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Changed placeholder when Core Data is empty
author Dennis Concepción Martín <dennisconcepcionmartin@gmail.com>
date Sun, 01 Aug 2021 12:17:51 +0100
parents b6f8661300f2
children 529feb1fc8d5
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1 //
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2 // Favorites.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 Favorites: View {
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11 @Environment(\.managedObjectContext) private var viewContext
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12 @FetchRequest(
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13 sortDescriptors: [NSSortDescriptor(keyPath: \Favorite.currencyPair, ascending: true)],
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14 animation: .default) private var favorite: FetchedResults<Favorite>
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16 var body: some View {
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17 VStack {
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18 if favorite.isEmpty {
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19 Group {
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20 Image(systemName: "star")
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21 .font(.title)
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22 Text("Search a currency pair and add it to favourites.")
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23 .padding(.top, 5)
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24 }
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25 .multilineTextAlignment(.center)
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26 .foregroundColor(Color(.systemGray))
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27 .padding(.horizontal, 50)
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28 } else {
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29 List {
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30 ForEach(favorite) { favorite in
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31 NavigationLink(destination: Conversion(showNavigationView: false, currencyPair: favorite.currencyPair)) {
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32 CurrencyRow(currencyPairName: favorite.currencyPair)
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33 }
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34 }
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35 .onDelete(perform: removeFromFavorites)
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36 }
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37 .listStyle(PlainListStyle())
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38 }
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39 }
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40 .navigationTitle("Favorites")
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41 .toolbar {
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42 #if os(iOS)
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43 EditButton()
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44 #endif
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45 }
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46 .if(UIDevice.current.userInterfaceIdiom == .phone) { content in
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47 NavigationView { content }
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48 }
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49 }
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51 private func removeFromFavorites(offsets: IndexSet) {
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52 withAnimation {
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53 offsets.map { favorite[$0] }.forEach(viewContext.delete)
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55 do {
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56 try viewContext.save()
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57 } catch {
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58 let nsError = error as NSError
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59 fatalError("Unresolved error \(nsError), \(nsError.userInfo)")
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60 }
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61 }
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62 }
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63 }
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65 struct Favorites_Previews: PreviewProvider {
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66 static var previews: some View {
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67 Favorites()
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68 // .environment(\.managedObjectContext, PersistenceController.preview.container.viewContext)
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69 }
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70 }