flutter_integrated_whb/lib/customWidget/single_image_viewer.dart

import 'dart:io';

import 'package:flutter/material.dart';
import 'package:photo_view/photo_view.dart';
import 'package:qhd_prevention/pages/my_appbar.dart';
// 查看大图
class SingleImageViewer extends StatelessWidget {
  final String imageUrl;
  const SingleImageViewer({Key? key, required this.imageUrl}) : super(key: key);

  @override
  Widget build(BuildContext context) {
    ImageProvider provider;
    if (imageUrl.toLowerCase().startsWith('http')) {
      provider = NetworkImage(imageUrl);
    } else {
      provider = FileImage(File(imageUrl));
    }
    return Scaffold(
      backgroundColor: Colors.black.withValues(alpha: 0.5),
      appBar: MyAppbar(
        isBack: false,
        actions: [
          IconButton(onPressed: () {
            Navigator.of(context).pop();
          }, icon: Icon(Icons.close, color: Colors.white, size: 40,),)
        ],
        backgroundColor: Colors.black.withValues(alpha:0.5), title: '',
      ),
      body: Center(
        child: PhotoView(
          imageProvider: provider,
          backgroundDecoration: BoxDecoration(color: Colors.black.withValues(alpha:0.5)),
          minScale: PhotoViewComputedScale.contained,
          maxScale: PhotoViewComputedScale.covered * 2,
          onTapUp: (context, details, controllerValue) {
            Navigator.of(context).pop();
          },
        ),
      ),
    );
  }
}