Flutter Image Pick 的二次封装

import 'dart:io';
import 'package:flutter/material.dart';
import 'package:image_picker/image_picker.dart';

// 设置图片宽高
var imageWidth = 750.0;
var imageHeight = 424.0;
var imageWidgetHeightRatio = imageWidth / imageHeight; //宽高比

class CommonImagePicker extends StatefulWidget {
  final ValueChanged<List<File>> onChange;

  const CommonImagePicker({Key? key, required this.onChange}) : super(key: key);

  @override
  _CommonImagePickerState createState() => _CommonImagePickerState();
}

class _CommonImagePickerState extends State<CommonImagePicker> {
  List<XFile> files = [];
  final ImagePicker _picker = ImagePicker();
  _pickImage() async {
    final XFile? image = await _picker.pickImage(source: ImageSource.camera);
    if (null == image) return;
    setState(() {
      files = files..add(image);
    });
  }

  @override
  Widget build(BuildContext context) {
    var width = (MediaQuery.of(context).size.width - 10.0 * 4) / 3;
    var height = width / imageWidgetHeightRatio;
    Widget addButton = GestureDetector(
      onTap: () {
        _pickImage();
      },
      behavior: HitTestBehavior.translucent,
      child: Container(
        width: width,
        height: height,
        color: Colors.grey,
        child: Center(
          child: Text(
            '+',
            style: TextStyle(fontSize: 40, fontWeight: FontWeight.w600),
          ),
        ),
      ),
    );

    Widget wrapper(XFile imageUri) {
      return Image.file(
        File(imageUri.path),
        height: height,
        width: width,
        fit: BoxFit.cover,
      );
    }

    List<Widget> list = files.map((item) => wrapper(item)).toList()
      ..add(addButton);

    return Container(
      padding: EdgeInsets.all(10),
      child: Wrap(
        spacing: 10,
        runSpacing: 10,
        children: list,
      ),
    );
  }
}