刚开始是这样：

import 'package:flutter/material.dart';
class TreeHome extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('首页'),
      ),
      body: Center(
        child: Text('首页'),
      ),
    );
  }
}

如果不显示标题，取消appBar就可以了。为下面样式:

import 'package:flutter/material.dart';
class TreeHome extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: Center(
        child: Text('首页'),
      ),
    );
  }
}