Flutter_学习记录_AppBar中取消leading的占位展示

  • leading设置为null
  • automaticallyImplyLeading设置为false

看看automaticallyImplyLeading的说明:

Controls whether we should try to imply the leading widget if null.

If true and [AppBar.leading] is null, automatically try to deduce what the leading widget should be. If false and [AppBar.leading] is null, leading space is given to [AppBar.title]. If leading widget is not null, this parameter has no effect.

意思就是说:

  • 如果leading为null 并且 automaticallyImplyLeading为true , 那么会保留leading的占位位置;
  • 如果如果leading为null 并且automaticallyImplyLeading为false , 那么会将leading的位置让给title;
  • 如果leading不为null , automaticallyImplyLeading这个设置失效。

代码如下:

dart 复制代码
@override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
      	
        leading: null,
        automaticallyImplyLeading: false,
        title: Container(
            margin: EdgeInsets.fromLTRB(0, 0, 0, 0), 
            height: Screenadapter.height(100),
            width:  Screenadapter.width(880) ,
            decoration: BoxDecoration(
              borderRadius: BorderRadius.circular(20),
              color: Color.fromARGB(10, 0, 0, 0)
            ),
            child: Row(
              crossAxisAlignment: CrossAxisAlignment.center,
              children: [
                Padding(padding: EdgeInsets.fromLTRB(10, 0, 0, 0), child: Icon(Icons.search, color: Colors.black26)),
                Expanded(child: Text("耳机", style: TextStyle(color: Colors.black45, fontSize: Screenadapter.fontSize(36)))),
                Padding(padding: EdgeInsets.fromLTRB(0, 0, 10, 0), child: Icon(FangXMIcon.saomiao, color: Colors.black26)),
              ],
            ),
          ),
        centerTitle: true,
        actions: [
          Container(
            padding: EdgeInsets.fromLTRB(0, 0, 0, 0),
            width: Screenadapter.width(124),
            height: Screenadapter.height(100),
            child: InkWell(
              child: Icon(FangXMIcon.xiaoxi, color: Colors.black54 ),
            ),
          )
        ],
      ),
      body: const Center(
        child: Text(
          'GiveView is working',
          style: TextStyle(fontSize: 20),
        ),
      ),
    );
  }

效果如下:

相关推荐
小墙程序员5 分钟前
Flutter 教程(七)网络请求
flutter
小墙程序员13 小时前
Flutter 教程(六)路由管理
flutter
zacksleo18 小时前
鸿蒙Flutter开发故事:不,你不需要鸿蒙化
flutter·harmonyos
帅次19 小时前
Flutter DropdownButton 详解
android·flutter·ios·kotlin·gradle·webview
bst@微胖子21 小时前
Flutter项目之构建打包分析
flutter
江上清风山间明月1 天前
Flutter开发There are multiple heroes that share the same tag within a subtree报错
android·javascript·flutter·动画·hero
无知的前端1 天前
Flutter 性能优化:实战指南
flutter·性能优化
飞川0011 天前
Flutter敏感词过滤实战:基于AC自动机的高效解决方案
android·flutter
小墙程序员1 天前
Flutter 教程(五)事件处理
flutter