Flutter Column 与Row

一,Column 属性值

MainAxisAlignment mainAxisAlignment = MainAxisAlignment.start,//主轴方向

MainAxisSize mainAxisSize = MainAxisSize.max,//最大容量

CrossAxisAlignment crossAxisAlignment = CrossAxisAlignment.center,//与主轴交叉方向

TextDirection textDirection,//水平方向

VerticalDirection verticalDirection = VerticalDirection.down,//纵轴方向

TextBaseline textBaseline,//基线

竖着排版，mainAxisAlignment是与verticalDirection结合的。 crossAxisAlignment与textDirection 结合

例如mainAxisAlignment:MainAxisAlignment.start, verticalDirection:VerticalDirection.down,(主轴开始方向开始且排版顺序是从上往下排)

mainAxisAlignment:MainAxisAlignment.end,verticalDirection:VerticalDirection.down(主轴结尾方向开始且排版顺序是从上往下排))

mainAxisAlignment:MainAxisAlignment.start, crossAxisAlignment:CrossAxisAlignment.start,textDirection:TextDirection.ltr,verticalDirection:VerticalDirection.down,mainAxisSize:MainAxisSize.max,（主轴开始方向且从上往下，左右从左开始）

mainAxisAlignment:MainAxisAlignment.start, crossAxisAlignment:CrossAxisAlignment.start,textDirection:TextDirection.rtl,verticalDirection:VerticalDirection.down,mainAxisSize:MainAxisSize.max,（主轴开始方向且从上往下，左右从右开始）

其实row与column 是相反的，在这就不一一介绍了，注意mainAxisSize:MainAxisSize.max 必须设最大