Flutter实现底部弹窗效果

onPressed: () async {
  int selectedIndex = await _showCustomModalBottomSheet(context, _options);
  print("自定义底部弹层：选中了第$selectedIndex个选项");
},
//...

Future<int> _showBasicModalBottomSheet(context, List<String> options) async {
    return showModalBottomSheet<int>(
      isScrollControlled: false,
      context: context,
      builder: (BuildContext context) {
        return ListView.builder(
          itemBuilder: (BuildContext context, int index) {
            return ListTile(
                title: Text(options[index]),
                onTap: () {
                  Navigator.of(context).pop(index);
                });
          },
          itemCount: options.length,
        );
      },
    );
  }

Future<int> _showCustomModalBottomSheet(context, List<String> options) async {
  return showModalBottomSheet<int>(
    backgroundColor: Colors.transparent,
    isScrollControlled: true,
    context: context,
    builder: (BuildContext context) {
      return Container(
        clipBehavior: Clip.antiAlias,
        decoration: BoxDecoration(
          color: Colors.white,
          borderRadius: BorderRadius.only(
            topLeft: const Radius.circular(20.0),
            topRight: const Radius.circular(20.0),
          ),
        ),
        height: MediaQuery.of(context).size.height / 2.0,
        child: Column(children: [
          SizedBox(
            height: 50,
            child: Stack(
              textDirection: TextDirection.rtl,
              children: [
                Center(
                  child: Text(
                    '底部弹窗',
                    style: TextStyle(
                        fontWeight: FontWeight.bold, fontSize: 16.0),
                  ),
                ),
                IconButton(
                    icon: Icon(Icons.close),
                    onPressed: () {
                      Navigator.of(context).pop();
                    }),
              ],
            ),
          ),
          Divider(height: 1.0),
          Expanded(
            child: ListView.builder(
              itemBuilder: (BuildContext context, int index) {
                return ListTile(
                    title: Text(options[index]),
                    onTap: () {
                      Navigator.of(context).pop(index);
                    });
              },
              itemCount: options.length,
            ),
          ),
        ]),
      );
    },
  );
}