SizedBox

const SizedBox({ 
 Key key, 
 this.width, //宽
 this.height, //高
 Widget child //子组件
})

SizedBox( width: 200.0, height: 200.0, child: new Container( color: Colors.red, width: 100.0, height: 300.0, ), ),

ConstrainedBox（限定最大最小宽高布局）

return new ConstrainedBox( constraints: const BoxConstraints( minWidth: 100.0, minHeight: 100.0, maxWidth: 150.0, maxHeight: 150.0, ), child: new Container( width: 200.0, height: 200.0, color: Colors.red, ), );

 LimitedBox（限定最大宽高布局）

const LimitedBox({ Key key, this.maxWidth = double.infinity, this.maxHeight = double.infinity, Widget child,})

LimitedBox( maxWidth: 150.0, child: new Container( color: Colors.blue, width: 250.0, ), )

AspectRatio（调整宽高比）

const AspectRatio({ Key key, @required this.aspectRatio, Widget child}) 

return new Container( height: 200.0, child: new AspectRatio( aspectRatio: 1.5, child: new Container( color: Colors.red, ), ), );

FractionallySizedBox（百分比布局）

return new Container( color: Colors.blue, height: 150.0, width: 150.0, padding: const EdgeInsets.all(10.0), child: new FractionallySizedBox( alignment: Alignment.topLeft, widthFactor: 1.5, heightFactor: 0.5, child: new Container( color: Colors.red, ), ), );