:::
6-16 倒數計時做某件事
6-17 AppBar 加入底圖或用圖片當標題
return Scaffold(
appBar: AppBar(
// title: Text(widget.title),
title: Image.asset('assets/images/logo.png'),
flexibleSpace: Image(
image: AssetImage('assets/images/bg.jpg'),
fit: BoxFit.cover,
),
backgroundColor: Colors.transparent,
),
);
