Load most recent accounts on launch

Trust/Coordinator/AppCoordinator.swift

@@ -23,7 +23,7 @@ class AppCoordinator: NSObject {
         return AccountsCoordinator(navigationController: self.rootNavigationController)
     }()
 
-    private let keystore: Keystore
+    private var keystore: Keystore
 
     init(
         window: UIWindow,
@@ -41,13 +41,14 @@ class AppCoordinator: NSObject {
         rootNavigationController.viewControllers = [welcomeViewController]
 
         if keystore.hasAccounts {
-            showTransactions(for: keystore.accounts.first!)
+            showTransactions(for: keystore.recentlyUsedAccount ?? keystore.accounts.first!)
         }
     }
 
     func showTransactions(for account: Account) {
         let controller = makeTransactionsController(with: account)
         rootNavigationController.viewControllers = [controller]
+        keystore.recentlyUsedAccount = account
     }
 
     func showCreateWallet() {

Trust/EtherClient/EtherKeystore.swift

@@ -7,6 +7,10 @@ import KeychainSwift
 
 class EtherKeystore: Keystore {
 
+    struct Keys {
+        static let recentlyUsedAddress: String = "recentlyUsedAddress"
+    }
+
     private let keychain = KeychainSwift(keyPrefix: "trustwallet")
     let datadir = NSSearchPathForDirectoriesInDomains(.documentDirectory, .userDomainMask, true)[0]
     lazy var ks: GethKeyStore = {
@@ -21,6 +25,16 @@ class EtherKeystore: Keystore {
         return !accounts.isEmpty
     }
 
+    var recentlyUsedAccount: Account? {
+        set {
+            keychain.set(newValue?.address.address ?? "", forKey: Keys.recentlyUsedAddress)
+        }
+        get {
+            let address = keychain.get(Keys.recentlyUsedAddress)
+            return accounts.filter { $0.address.address == address }.first
+        }
+    }
+
     func createAccout(password: String) -> Account {
         let account = try! ks.newAccount(password)
         return .from(account: account)

Trust/EtherClient/Keystore.swift

@@ -5,4 +5,5 @@ import Foundation
 protocol Keystore {
     var hasAccounts: Bool { get }
     var accounts: [Account] { get }
+    var recentlyUsedAccount: Account? { get set }
 }

TrustTests/Factories/FakeKeystore.swift

@@ -7,15 +7,26 @@ struct FakeKeystore: Keystore {
     var hasAccounts: Bool {
         return accounts.count > 0
     }
-    var accounts: [Account] = []
+    var accounts: [Account]
+    var recentlyUsedAccount: Account?
+
+    init(
+        accounts: [Account] = [],
+        recentlyUsedAccount: Account? = .none
+    ) {
+        self.accounts = accounts
+        self.recentlyUsedAccount = recentlyUsedAccount
+    }
 }
 
 extension FakeKeystore {
     static func make(
-        accounts: [Account] = []
+        accounts: [Account] = [],
+        recentlyUsedAccount: Account? = .none
     ) -> FakeKeystore {
         return FakeKeystore(
-            accounts: accounts
+            accounts: accounts,
+            recentlyUsedAccount: recentlyUsedAccount
         )
     }
 }