一,Column 屬性值
MainAxisAlignment mainAxisAlignment = MainAxisAlignment.start,//主軸方向
MainAxisSize mainAxisSize = MainAxisSize.max,//最大容量
CrossAxisAlignment crossAxisAlignment = CrossAxisAlignment.center,//與主軸交叉方向
TextDirection textDirection,//水平方向
VerticalDirection verticalDirection = VerticalDirection.down,//縱軸方向
TextBaseline textBaseline,//基線
豎著排版，mainAxisAlignment是與verticalDirection結(jié)合的。?crossAxisAlignment與textDirection 結(jié)合
例如mainAxisAlignment:MainAxisAlignment.start,?verticalDirection:VerticalDirection.down,(主軸開(kāi)始方向開(kāi)始且排版順序是從上往下排)
mainAxisAlignment:MainAxisAlignment.end,verticalDirection:VerticalDirection.down(主軸結(jié)尾方向開(kāi)始且排版順序是從上往下排))
mainAxisAlignment:MainAxisAlignment.start, crossAxisAlignment:CrossAxisAlignment.start,textDirection:TextDirection.ltr,verticalDirection:VerticalDirection.down,mainAxisSize:MainAxisSize.max,（主軸開(kāi)始方向且從上往下，左右從左開(kāi)始）
mainAxisAlignment:MainAxisAlignment.start, crossAxisAlignment:CrossAxisAlignment.start,textDirection:TextDirection.rtl,verticalDirection:VerticalDirection.down,mainAxisSize:MainAxisSize.max,（主軸開(kāi)始方向且從上往下，左右從右開(kāi)始）
其實(shí)row與column 是相反的，在這就不一一介紹了，注意mainAxisSize:MainAxisSize.max 必須設(shè)最大
