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flutter 如何让两个子控件左对齐和右对齐

第一种：Flexible

Row(
  children: <Widget>[
    Align(
      alignment: Alignment.centerLeft,
      child: Text('123'),
    ),
    Flexible(fit: FlexFit.tight, child: SizedBox()),
    Align(
      alignment: Alignment.centerRight,
      child:
          Image.asset('lib/images/arrow_right.png'),
    )
  ],
)

第二种：spaceBetween

Row(
  mainAxisAlignment: MainAxisAlignment.spaceBetween,
  children: <Widget>[
    Align(
      alignment: Alignment.centerLeft,
      child: Text('123'),
    ),
    Align(
      alignment: Alignment.centerRight,
      child:
          Image.asset('lib/images/arrow_right.png'),
    )
  ],
)