'Future '在尝试访问Flutter中的Future SmsMessage变量的主体时，没有实例getter'body'错误

Question

这是单独文件中的类

import 'package:sms/sms.dart';

class SmsReader {
  SmsMessage sms;
  dynamic messageRead() async {
    SmsReceiver receiver = SmsReceiver();
    receiver.onSmsReceived.listen((SmsMessage msg) {
      sms = msg;
    });
    return sms;
  }
}

此文件是创建对象并调用func的位置

class _HomePageState extends State<HomePage> {

  SmsReader smsReader = SmsReader();
  dynamic sms;

  @override
  void initState() {
    sms = smsReader.messageRead();
    super.initState();
  }

现在，当我尝试print(sms.body)，出现此错误

类'Future'没有实例获取器'body'。接收方：“未来”的实例尝试调用：正文

Answer 1

检查是否有效：

import 'package:sms/sms.dart';

class SmsReader {
  SmsMessage sms;
  Future<dynamic> messageRead() async {
    SmsReceiver receiver = await SmsReceiver();
    receiver.onSmsReceived.listen((SmsMessage msg) {
      sms = msg;
    });
    return sms;
  }
}

class _HomePageState extends State<HomePage> {

  SmsReader smsReader = SmsReader();
  dynamic sms;

  @override
  void initState() {
    sms = smsReader.messageRead().then((data) => ...);
    super.initState();
  }

Answer 2

进行更改

  Future<dynamic> messageRead() async {
    SmsReceiver receiver = SmsReceiver();
      receiver.onSmsReceived.listen((SmsMessage msg) {
        sms = msg;
      });
    return sms;
  }

和

smsReader.messageRead().then((value) => print(value.toString()));

让我知道它是否有效。