Implemented hiding update all accounts' transaction when no account has been added; Implemented array extension property isNotEmpty

ui/BankingiOSApp/BankingiOSApp/ContentView.swift

@@ -113,10 +113,12 @@ struct ContentView: View {
         // due to a SwiftUI bug this cannot be set in AccountsTab directly, so i have to do it here
         self.navigationBarTitle = "Accounts"
         
+        if data.hasAtLeastOneAccountBeenAdded {
             self.leadingNavigationBarItem = AnyView(UpdateButton { _ in
                 self.presenter.updateAccountsTransactionsAsync { _ in }
             })
         }
+    }
     
 }
 

ui/BankingiOSApp/BankingiOSApp/persistence/AppData.swift

@@ -8,12 +8,16 @@ class AppData : ObservableObject {
     
     @Published var banks: [Customer] = []
     
+    @Published var hasAtLeastOneAccountBeenAdded: Bool = false
+    
     
     init() {
         banks = presenter.customers
+        hasAtLeastOneAccountBeenAdded = banks.isNotEmpty
         
         presenter.addAccountsChangedListener { banks in
             self.banks = banks
+            self.hasAtLeastOneAccountBeenAdded = banks.isNotEmpty
         }
     }
     

ui/BankingiOSApp/BankingiOSApp/ui/SwiftExtensions.swift

@@ -90,6 +90,15 @@ extension Array where Element == NSDecimalNumber {
 }
 
 
+extension Array {
+    
+    var isNotEmpty: Bool {
+        return !isEmpty
+    }
+    
+}
+
+
 extension NSObject {
     
     var className: String {

ui/BankingiOSApp/BankingiOSApp/ui/views/AccountsTab.swift

@@ -11,7 +11,7 @@ struct AccountsTab: View {
 
     var body: some View {
         VStack {
-            if data.banks.isEmpty == false {
+            if data.banks.isNotEmpty {
                 Form {
                     AllBanksListItem(banks: data.banks)