小编dev*_*foz的帖子

当我尝试将图像复制到特定位置时，出现The method 'copy' isn't Defined for the type 'XFile' 错误。 错误。当我尝试将图像复制到设备中的特定位置时

详细错误：未为类型“XFile”定义方法“copy”。尝试将名称更正为现有方法的名称，或定义名为 'copy'.dartundefine_method 的方法

导入 'dart:io';

import 'package:flutter/material.dart';
import 'package:image_picker/image_picker.dart';
import 'package:path/path.dart' as path;
import 'package:path_provider/path_provider.dart' as syspaths;

class ImageInput extends StatefulWidget {
  @override
  _ImageInputState createState() => _ImageInputState();
}

class _ImageInputState extends State<ImageInput> {
  File _storedImage;

  Future<void> _takePicture() async {
    final picker = ImagePicker();
    final imageFile = await picker.pickImage(
      source: ImageSource.camera,
      maxWidth: 600,
    );
    setState(() {
      _storedImage = File(imageFile.path);
    });
    final appDir = await syspaths.getApplicationDocumentsDirectory();
    final fileName = path.basename(imageFile.path); …

我收到一个错误，例如：

无法从工厂构造函数访问实例成员。尝试删除对实例成员的引用。

有什么解决办法吗？

class DepartureModel {
  String route;
  String departureTime;
  String arrivalTime;
  String tourType;
  List<String> daysOfWeek;

  DepartureModel({
    required this.route,
    required this.departureTime,
    required this.arrivalTime,
    required this.tourType,
    required this.daysOfWeek,
  });

  //method that assign values to respective datatype vairables

  factory DepartureModel.fromJson(Map<String, dynamic> json) {
    return DepartureModel(
      route: json['route'],
      departureTime: json['departureTime'],
      arrivalTime: json['arrivalTime'],
      tourType: json['tourType'],
      daysOfWeek: json["daysOfWeek"].forEach(
        (day) {
          daysOfWeek.add(day);
        },
      ),
    );
  }