它似乎更容易只是创建一个新的按钮，并添加颜色，这里我是如何做的任何人都想知道

Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        leading: BackButton(
            color: Colors.black
        ),

你必须使用AppBar中的iconTheme属性，像这样:

appBar: AppBar(
  iconTheme: IconThemeData(
    color: Colors.black, //change your color here
  ),
  title: Text("Sample"),
  centerTitle: true,
),

或者你想自己操作后退按钮。

appBar: AppBar(
  leading: IconButton(
    icon: Icon(Icons.arrow_back, color: Colors.black),
    onPressed: () => Navigator.of(context).pop(),
  ), 
  title: Text("Sample"),
  centerTitle: true,
),

更好的是，只有当你想改变后退按钮的颜色时才可以这样做。

appBar: AppBar(
  leading: BackButton(
     color: Colors.black
   ), 
  title: Text("Sample"),
  centerTitle: true,
),

更改CupertinoPageScaffold的主色调

Theme(
  data: Theme.of(context).copyWith(
    cupertinoOverrideTheme: CupertinoThemeData(
      scaffoldBackgroundColor: Colors.white70,
      primaryColor: Styles.green21D877, // HERE COLOR OF LEADING
    ),
  ),
  child: CupertinoPageScaffold(
    navigationBar: CupertinoNavigationBar(
      brightness: Brightness.light,
      backgroundColor: Colors.white,
      middle: Text('Cupertino App Bar'),
    ),
    child: Container(
      child: Center(
        child: CupertinoActivityIndicator(),
      ),
    ),
  ),
)

你可以自定义AppBarWidget，关键字with是重要的，或者你可以将你的自定义AppBarWidget分配给脚手架的appBar属性:

import 'package:flutter/material.dart';

double _getAppBarTitleWidth(
    double screenWidth, double leadingWidth, double tailWidth) {
  return (screenWidth - leadingWidth - tailWidth);
}

class AppBarWidget extends StatelessWidget with PreferredSizeWidget {
  AppBarWidget(
      {Key key,
      @required this.leadingChildren,
      @required this.tailChildren,
      @required this.title,
      this.leadingWidth: 110,
      this.tailWidth: 30})
      : super(key: key);

  final List<Widget> leadingChildren;
  final List<Widget> tailChildren;
  final String title;
  final double leadingWidth;
  final double tailWidth;

  @override
  Widget build(BuildContext context) {
    // Get screen size
    double _screenWidth = MediaQuery.of(context).size.width;

    // Get title size
    double _titleWidth =
        _getAppBarTitleWidth(_screenWidth, leadingWidth, tailWidth);

    double _offsetToRight = leadingWidth - tailWidth;

    return AppBar(
      title: Row(
        children: [
          Container(
            width: leadingWidth,
            child: Row(
              mainAxisAlignment: MainAxisAlignment.start,
              children: leadingChildren,
            ),
          ),
          Container(
            color: Colors.green,
            width: _titleWidth,
            padding: const EdgeInsets.only(left: 5.0, right: 5),
            child: Container(
              padding: EdgeInsets.only(right: _offsetToRight),
              color: Colors.deepPurpleAccent,
              child: Center(
                child: Text('$title'),
              ),
            ),
          ),
          Container(
            color: Colors.amber,
            width: tailWidth,
            child: Row(
              children: tailChildren,
            ),
          )
        ],
      ),
      titleSpacing: 0.0,
    );
  }

  @override
  Size get preferredSize => Size.fromHeight(kToolbarHeight);
}

下面是它的使用示例:

import 'package:flutter/material.dart';
import 'package:seal_note/ui/Detail/DetailWidget.dart';
import 'package:seal_note/ui/ItemListWidget.dart';

import 'Common/AppBarWidget.dart';
import 'Detail/DetailPage.dart';

class MasterDetailPage extends StatefulWidget {
  @override
  State<StatefulWidget> createState() => _MasterDetailPageState();
}

class _MasterDetailPageState extends State<MasterDetailPage> {
  @override
  Widget build(BuildContext context) { 
    return Scaffold(
      appBar: AppBarWidget(leadingChildren: [
        IconButton(
          icon: Icon(
            Icons.arrow_back_ios,
            color: Colors.white,
          ),
        ),
        Text(
          '文件夹',
          style: TextStyle(fontSize: 14.0),
        ),
      ], tailChildren: [
        Icon(Icons.book),
        Icon(Icons.hd),
      ], title: '英语知识',leadingWidth: 140,tailWidth: 50,),
      body: Text('I am body'),
    );
  }
}

你可以使用foregroundColor属性。例如:

AppBar(
    backgroundColor: Colors.white,
    foregroundColor: Colors.black,
    title: const Text('Black title and back icon on a white AppBar'),
  )

它似乎更容易只是创建一个新的按钮，并添加颜色，这里我是如何做的任何人都想知道

Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        leading: BackButton(
            color: Colors.black
        ),