Flutter_学习记录_AppBar中取消leading的占位展示

• 将leading设置为null
• 将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：

@overrideWidget 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：