Flutter安全存儲

Question

如何從FutureBuilder中未提供的任何其他功能中從安全存儲中獲取數據。

    Future<void> login() async {
      print('LOGGGGINNNNNNNNNNNN');
      print(read('TOKEN'));
    }

    Future read(String storageName) async {
      return await _storage.read(key: storageName);
    }

打印結果：“未來”實例

Answer 1

你應該這樣做

    Future<void> login() async {
      print('LOGGGGINNNNNNNNNNNN');
      print(await read('TOKEN'));
    }

    Future read(String storageName) async {
      return _storage.read(key: storageName);
    }

由於read返回Future，它將打印您當前看到的內容，因此您需要等待其完成。

Answer 2

解

Future readStorage(String storageName) async {
  return await _storage.read(key: storageName);
}

 Future getToken() async {
  final _storage = new FlutterSecureStorage();
  await Future.sync(()  async =>  _token = await _storage.read(key: 'TOKEN'));
 }

Future<void> login() async {
  getToken().then((value){
  print(_token);
  if(_token == 'Not Authenticated' || _token == null)
    {
      setState(() {
        _isAuthenticated = false;
      });
    }
  else {
    setState(() {
      _isAuthenticated = true;
    });
  }
});
}