LateInitializationError:字段“”_instance@99075166“”尚未初始化

class MyClass {
  late int _instance;

  MyClass() {
    _instance = 42; // 确保在这里初始化
  }

  void printInstance() {
    print(_instance);
  }
}

class MyClass {
  late int _instance;

  int getInstance() {
    return _instance ?? 0; // 提供默认值
  }
}

import 'package:flutter/material.dart';

class MyWidget extends StatelessWidget {
  final Future<int> _futureInstance = Future.delayed(Duration(seconds: 1), () => 42);

  @override
  Widget build(BuildContext context) {
    return FutureBuilder<int>(
      future: _futureInstance,
      builder: (context, snapshot) {
        if (snapshot.connectionState == ConnectionState.done) {
          return Text('Instance: ${snapshot.data}');
        } else {
          return CircularProgressIndicator();
        }
      },
    );
  }
}

class MyClass {
  late int _instance;

  MyClass() {
    initialize();
  }

  void initialize() {
    _instance = 42; // 确保在这里初始化
  }

  void printInstance() {
    print(_instance);
  }
}