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如果没有leading，automaticallyImplyLeading为true，就会默认返回箭头
如果没有leading，automaticallyImplyLeading为false，空间留给title
如果有leading，automaticallyImplyLeading 这个参数就无效了

import 'package:flutter/material.dart';

class FlutterPage extends StatelessWidget {
  const FlutterPage({
    Key? key,
  }) : super(key: key);

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
          automaticallyImplyLeading: ...,
          leading: ...,
          ),
      body: Container(),
    );
  }
}