Added a project.

Other Projects/Currency-SwiftUI/Currency-SwiftUI/AddCurrencyView.swift

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+//
+//  AddCurrencyView.swift
+//  Currency-SwiftUI
+//
+//  Created by Alex Liu on 2019-06-20.
+//  Copyright © 2018 Alex Liu <alexliubo@gmail.com> All rights reserved.
+//
+//  Permission is hereby granted, free of charge, to any person obtaining a copy
+//  of this software and associated documentation files (the "Software"), to deal
+//  in the Software without restriction, including without limitation the rights
+//  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+//  copies of the Software, and to permit persons to whom the Software is
+//  furnished to do so, subject to the following conditions:
+//
+//  The above copyright notice and this permission notice shall be included in
+//  all copies or substantial portions of the Software.
+//
+//  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+//  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+//  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+//  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+//  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+//  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+//  THE SOFTWARE.
+
+import Foundation
+import SwiftUI
+
+struct AddCurrencyView : View {
+    @EnvironmentObject var userData: UserData
+    
+    var body: some View {
+        List {
+            ForEach(userData.allCurrencies) { currency in
+                return HStack {
+                    Button(action: { self.select(currency) }) {
+                        Text("\(currency.code) - \(currency.name)")
+                    }
+                    Spacer()
+                    if self.isSelected(currency) {
+                        Image(systemName: "checkmark").foregroundColor(.blue)
+                    }
+                }
+            }
+            }.navigationBarItem(title: Text("Add Currency"))
+    }
+    
+    private func select(_ currency: Currency) {
+        if userData.userCurrency.map({ $0.code }).contains(currency.code) {
+            userData.userCurrency.removeAll{$0.code == currency.code}
+        }
+        else {
+            userData.userCurrency.append(currency)
+        }
+    }
+    
+    private func isSelected(_ currency: Currency) -> Bool {
+        return userData.userCurrency.map({ $0.code }).contains(currency.code)
+    }
+}
+
+