Fixes.

cw_monero/ios/Classes/monero_api.cpp

@@ -351,13 +351,11 @@ extern "C"
 
     uint64_t get_full_balance(uint32_t account_index)
     {
-//        return 0;
         return get_current_wallet()->balance(account_index);
     }
 
     uint64_t get_unlocked_balance(uint32_t account_index)
     {
-//        return 0;
         return get_current_wallet()->unlockedBalance(account_index);
     }
 

lib/main.dart

@@ -29,6 +29,7 @@ import 'package:cake_wallet/src/screens/root/root.dart';
 final navigatorKey = GlobalKey<NavigatorState>();
 
 void main() async {
+  try {
     WidgetsFlutterBinding.ensureInitialized();
 
     final appDir = await getApplicationDocumentsDirectory();
@@ -41,7 +42,6 @@ void main() async {
     Hive.registerAdapter(WalletTypeAdapter());
     Hive.registerAdapter(TemplateAdapter());
     Hive.registerAdapter(ExchangeTemplateAdapter());
-
     final secureStorage = FlutterSecureStorage();
     final transactionDescriptionsBoxKey = await getEncryptionKey(
         secureStorage: secureStorage, forKey: TransactionDescription.boxKey);
@@ -70,6 +70,18 @@ void main() async {
         transactionDescriptions: transactionDescriptions,
         initialMigrationVersion: 4);
     runApp(App());
+  } catch (e) {
+    runApp(MaterialApp(
+        debugShowCheckedModeBanner: true,
+        home: Scaffold(
+            body: Container(
+                margin:
+                    EdgeInsets.only(top: 50, left: 20, right: 20, bottom: 20),
+                child: Text(
+                  'Error:\n${e.toString()}',
+                  style: TextStyle(fontSize: 22),
+                )))));
+  }
 }
 
 Future<void> initialSetup(

lib/monero/monero_amount_format.dart

@@ -7,9 +7,11 @@ final moneroAmountFormat = NumberFormat()
   ..maximumFractionDigits = moneroAmountLength
   ..minimumFractionDigits = 1;
 
-String moneroAmountToString({int amount}) =>
-    moneroAmountFormat.format(cryptoAmountToDouble(amount: amount, divider: moneroAmountDivider));
+String moneroAmountToString({int amount}) => moneroAmountFormat
+    .format(cryptoAmountToDouble(amount: amount, divider: moneroAmountDivider));
 
-double moneroAmountToDouble({int amount}) => cryptoAmountToDouble(amount: amount, divider: moneroAmountDivider);
+double moneroAmountToDouble({int amount}) =>
+    cryptoAmountToDouble(amount: amount, divider: moneroAmountDivider);
 
-int moneroParseAmount({String amount}) => moneroAmountFormat.parse(amount).toInt();
+int moneroParseAmount({String amount}) =>
+    (double.parse(amount) * moneroAmountDivider).toInt();

lib/monero/monero_transaction_creation_exception.dart

@@ -0,0 +1,8 @@
+class MoneroTransactionCreationException implements Exception {
+  MoneroTransactionCreationException(this.message);
+
+  final String message;
+
+  @override
+  String toString() => message;
+}

lib/monero/monero_wallet.dart

@@ -1,3 +1,7 @@
+import 'dart:async';
+
+import 'package:cake_wallet/monero/monero_amount_format.dart';
+import 'package:cake_wallet/monero/monero_transaction_creation_exception.dart';
 import 'package:flutter/foundation.dart';
 import 'package:mobx/mobx.dart';
 import 'package:cw_monero/wallet.dart';
@@ -170,6 +174,19 @@ abstract class MoneroWalletBase extends WalletBase<MoneroBalance> with Store {
   @override
   Future<PendingTransaction> createTransaction(Object credentials) async {
     final _credentials = credentials as MoneroTransactionCreationCredentials;
+    final amount = moneroParseAmount(amount: _credentials.amount);
+    final unlockedBalance =
+        monero_wallet.getUnlockedBalance(accountIndex: account.id);
+
+    if (unlockedBalance < amount) {
+      throw MoneroTransactionCreationException(
+          'Incorrect unlocked balance. Unlocked: $unlockedBalance. Transaction amount: ${_credentials.amount}.');
+    }
+
+    if (!(syncStatus is SyncedSyncStatus)) {
+      throw MoneroTransactionCreationException('The wallet is not synced.');
+    }
+
     final pendingTransactionDescription =
         await transaction_history.createTransaction(
             address: _credentials.address,