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annotate Simoleon/UI/CurrencySelector.swift @ 157:8c3bbd640103

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Implement Currency Selector
author Dennis Concepcion Martin <dennisconcepcionmartin@gmail.com>
date Sat, 28 Aug 2021 11:15:41 +0100
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children 35628bac01f5
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1 //
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2 // CurrencySelector.swift
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3 // Simoleon
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4 //
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5 // Created by Dennis Concepción Martín on 27/8/21.
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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 CurrencySelector: View {
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11 @State var currencyPair: CurrencyPairModel
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12 @State private var showingList = false
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13 @State private var modalSelection: ModalType? = nil
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14 let currencyPairsSupported: [String] = try! read(json: "CurrencyPairsSupported.json")
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15
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16 private enum ModalType {
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17 case allCurrencies, compatibleCurrencies
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18 }
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19
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20 var body: some View {
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21 HStack {
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22 Button(action: {
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23 showingList = true
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24 modalSelection = .allCurrencies
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25 }) {
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26 CurrencyButton(selectedCurrency: currencyPair.baseSymbol)
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27 }
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28
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29 Button(action: {
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30 showingList = true
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31 modalSelection = .compatibleCurrencies
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32 }) {
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33 CurrencyButton(selectedCurrency: currencyPair.quoteSymbol)
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34 }
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35 }
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36 .onChange(of: currencyPair.baseSymbol) { _ in
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37 // If the previous quote symbol is not compatible anymore with base symbol
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38 // return the first symbol of the new compatible symbols list
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39 let compatibleCurrencies = get(currencyType: .compatible(with: currencyPair.baseSymbol), from: currencyPairsSupported)
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40 if !compatibleCurrencies.contains(currencyPair.quoteSymbol) {
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41 currencyPair.quoteSymbol = compatibleCurrencies.sorted().first!
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42 }
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43 }
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44 .sheet(isPresented: $showingList) {
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45 if modalSelection == .allCurrencies {
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46 let currencies = get(currencyType: .all, from: currencyPairsSupported)
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47 CurrencyList(currencies: currencies, selectedCurrency: $currencyPair.baseSymbol)
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48 } else {
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49 let currencies = get(currencyType: .compatible(with: currencyPair.baseSymbol), from: currencyPairsSupported)
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50 CurrencyList(currencies: currencies, selectedCurrency: $currencyPair.quoteSymbol)
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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 enum CurrencyType {
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56 case all
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57 case compatible(with: String)
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58 }
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59
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60 func get(currencyType: CurrencyType, from currencyPairsSupported: [String]) -> [String] {
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61 var currencies = Set<String>()
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62
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63 switch currencyType {
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64 case .all:
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65 for currencyPairSupported in currencyPairsSupported {
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66 let currency = currencyPairSupported.components(separatedBy: "/")[0]
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67 currencies.insert(currency)
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68 }
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69
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70 return Array(currencies)
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71
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72 case .compatible(with: let symbol):
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73 for currencyPairSupported in currencyPairsSupported {
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74 if currencyPairSupported.hasPrefix(symbol) {
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75 let compatibleCurrency = currencyPairSupported.components(separatedBy: "/")[1]
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76 currencies.insert(compatibleCurrency)
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77 }
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78 }
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79
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80 return Array(currencies)
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81 }
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82 }
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83 }
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84
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85 struct CurrencySelector_Previews: PreviewProvider {
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86 static var previews: some View {
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87 CurrencySelector(currencyPair: CurrencyPairModel(baseSymbol: "USD", quoteSymbol: "EUR"))
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88 }
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89 }