您可以将
Positioned.fill和组合在一起
LayoutBuilder以达到这样的结果。
new Stack( children: <Widget>[ new Positioned.fill( child: new LayoutBuilder( builder: (context, constraints) { return new Padding( padding: new EdgeInsets.only(top: constraints.biggest.height * .59, bottom: constraints.biggest.height * .31), child: new Text("toto", textAlign: TextAlign.center,), ); }, ), ) ], ),
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