如何在 Flutter 中使列和行项目居中？

Question

我有小币table。我没有使用网格。我使用了列和行。问题是行中的项目没有显示在中心，如下面的 Excel 示例所示。我必须使用什么小部件才能使项目居中？

示例代码：

return new Center(
  child: new Column(
    crossAxisAlignment: CrossAxisAlignment.center,
    children: <Widget>[
      new Row(
        mainAxisAlignment: MainAxisAlignment.center,
        children: <Widget>[
          new Padding(
            padding: const EdgeInsets.fromLTRB(15.0, 5.0, 15.0, 5.0),
            child: new Icon(
              Icons.crop_rotate,
              color: Colors.white,
            ),
          ),
          new Padding(
            padding: const EdgeInsets.fromLTRB(15.0, 5.0, 15.0, 5.0),
            child: new Text("STG", style: mainHeadTextStyle),
          ),
          new Padding(
            padding: const EdgeInsets.fromLTRB(15.0, 5.0, 15.0, 5.0),
            child: new Text("EUR", style: mainHeadTextStyle),
          ),
          new Padding(
            padding: const EdgeInsets.fromLTRB(15.0, 5.0, 15.0, 5.0),
            child: new Text("USD", style: mainHeadTextStyle),
          ),
        ],
      ),
      new Row(
        mainAxisAlignment: MainAxisAlignment.center,
        children: <Widget>[
....
....
....

Answer 1

如果你想要整个table是Centered，使用mainAxisAlignment属性 of ]Column.

列

mainAxisAlignment: MainAxisAlignment.center //Center Column contents vertically,
crossAxisAlignment: CrossAxisAlignment.center //Center Column contents horizontally,

行

mainAxisAlignment: MainAxisAlignment.center //Center Row contents horizontally,
crossAxisAlignment: CrossAxisAlignment.center //Center Row contents vertically,

Answer 2

如果你想要像图片那样，就用

mainAxisAlignment: MainAxisAlignment.spaceEvenly

Answer 3

如果你想要精细的粒度控制，你可以使用Spacer。

Column(
  children: <Widget>[
    Spacer(), // 1st spacer
    Widget1(),
    Widget2(),
    Spacer(), // 2nd spacer
  ],
)

您也可以使用 Spacer(flex:2)

更改 flex

Answer 4

这样使用

In Colum

child: Column(
            mainAxisAlignment: MainAxisAlignment.center,
            crossAxisAlignment: CrossAxisAlignment.center,
            children: [...
                       .
                       ]

In Row

 child: Row(
    mainAxisAlignment: MainAxisAlignment.center,
    crossAxisAlignment: CrossAxisAlignment.center,
    children: [...
                       .
                       ]

如何在 Flutter 中使列和行项目居中？

How to center column and row item in Flutter?

grid

flutter-layout