大部分Flutter小部件都是矩形，可以將他們疊放、堆疊、甚至巢狀他們。FittedBox可以根據合適的尺度對孩子進行縮放和定位。
MyBlueRect(
child:FittedBox(
alignment:Alignment.centerLeft,
fit:BoxFit.contain,
child:MyCatPic(),
),
)
複製程式碼7、Flutter Widget - FittedBox;
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