printTrans method

@override Future<Map<String, dynamic>> printTrans()

在事务模式下触发打印

Implementation

@override
Future<Map<String, dynamic>> printTrans() async {
  var rr =
      await _methodChannel.invokeMethod(Constants.METHOD_LINE_PRINT_TRANS);
  // 显式转换
  Map<String, dynamic> result = Map<String, dynamic>.from(rr);
  return result;
}