Flutter使用fluwx实现微信分享

1.在pubspec.yaml添加fluwx库

dependencies:
  flutter:
    sdk: flutter
  # https://pub.flutter-io.cn/packages/fluwx
  # https://github.com/OpenFlutter/fluwx
  fluwx: ^3.6.1+3

Android配置
如果需要微信回调，需要配置WXEntryActivity和WXPayEntryActivity，如果不使用回调，则不需要特殊配置。详见官方doc

IOS配置
如官方文档所示，需要配置ios的URLSchema, LSApplicationQueriesSchemes or universal link

ios/Runner/Info.plist

<key>CFBundleURLTypes</key>
    <array>
    <dict>
        <key>CFBundleTypeRole</key>
        <string>Editor</string>
        <key>CFBundleURLName</key>
        <string>your url name</string>
        <key>CFBundleURLSchemes</key>
        <array>
            <string>your scheme</string>
        </array>
    </dict>
    <dict>
        <key>CFBundleTypeRole</key>
        <string>Editor</string>
        <key>CFBundleURLName</key>
        <string>weixin</string>
        <key>CFBundleURLSchemes</key>
        <array>
            <string>you wechat appid</string>
        </array>
    </dict>
</array>
<key>LSApplicationQueriesSchemes</key>
<array>
    <string>wechat</string>
    <string>weixin</string>
    <string>weixinULAPI</string>
</array>

其中CFBundleURLTypes的第一项是为了能够从url跳回APP所设置

ios/Runner/Runner.entitlements

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
  <!-- ... other keys -->
  <key>com.apple.developer.associated-domains</key>
  <array>
    <string>webcredentials:your universal link</string>
  </array>
  <!-- ... other keys -->
</dict>
</plist>

这里的universal link要与微信开放平台上的设置保持一致。

2.申请微信分享APPID

@override
  void initState() {
    super.initState();
    _initShare();
  }
  _initShare() async {
    await fluwx.registerWxApi(
        appId: "微信分享appid",
        doOnAndroid: true,
        doOnIOS: true,
        universalLink: "ios要填这个https://your.univerallink.com/link/");
    var result = await fluwx.isWeChatInstalled;
    print("is installed $result");
  }

3.定义分享items,ShareOpt的参数包括标题、图片、分享类型（如好友、朋友圈等），回调方法（当点击后，可以在回调中做相应的分享）

/*
 * @param shareInfo - {url: '', title: '', image: '',} 
 */
  weChatShareWebPage(Map shareInfo, fluwx.WeChatScene type) {
    String pic = shareInfo['image'] as String;
    String url = shareInfo['url'] as String;
    if (url == '' || url.isEmpty) {
      url = Constant.shareUrl;
    }
    var model = fluwx.WeChatShareWebPageModel(
      url,
      description: '微信分享描述',
      title: shareInfo['title'],
      thumbnail: fluwx.WeChatImage.network(pic),
      scene: type,
    );
    fluwx.shareToWeChat(model);
  }

关于更多分享方式可以参考：

https://pub.flutter-io.cn/packages/fluwx
https://github.com/OpenFlutter/fluwx