IndexedStack（每日Flutter小部件）

/**
* 集成自Stack，用来显示第index个child，
* IndexedStack({
Key key,
AlignmentGeometry alignment = AlignmentDirectional.topStart,
TextDirection textDirection,
StackFit sizing = StackFit.loose,
this.index = 0,
List children = const [],
})
*/

例：

import 'package:flutter/material.dart';
class IndexedStackWidget extends StatelessWidget {
@override
Widget build(BuildContext context) {
return IndexedStack(
alignment: AlignmentDirectional.center,
textDirection: TextDirection.ltr,
sizing: StackFit.loose,
index: 0,
children: [
Container(
width: 100,
height: 100,
color: Colors.red,
),
Container(
width: 80,
height: 80,
color: Colors.blue,
),
Container(
width: 50,
height: 50,
color: Colors.green,
),
],
);
}
}

运行结果