坑：
1.将Flutter代码的bin目录加入到系统环境变量中
打开bash_profile文件时需要用命令行打开，如果是用鼠标打开，那么配置会不生效
open .bash_profile
2.flutter doctor一直提示以下错误
✗ **libimobiledevice and ideviceinstaller are not installed. To install, run:
brew install --HEAD libimobiledevice
brew install ideviceinstaller**
3.Error fetching https://gems.ruby-china.org/: bad response Not Found 404 报错解决办法
服务域名发生了变化，将org替换为com
3.FutureBuilder作为根widget会crash
@override
Widget build(BuildContext context) {
return FutureBuilder(
future: fetchPosts(),
builder: _buildFuture,
);
}
在写一个获取网络数据然后选肉listview的功能时，一直报这个错
'package:flutter/src/painting/basic_types.dart': Failed assertion: line 222 pos 10: 'textDirection
改成下面这种就OK了，原因还没搞清楚，搞清楚再补充
@override
Widget build(BuildContext context) {
return MaterialApp(
home: Scaffold(
body: FutureBuilder(
future: fetchPosts(),
builder: _buildFuture,
),
),
);
}