dart - Flutter:堆栈中底部中心小部件

Question

我想要实现像这张照片一样的效果。为了简化，我创建了一个包含两个容器的堆栈。我想使用对齐小部件将小容器底部居中，但它不起作用!它始终保持在顶部

Stack(
              overflow: Overflow.visible,
              children: <Widget>[
                Container(
                  width: MediaQuery.of(context).size.width,
                  height: 170,
                  decoration: BoxDecoration(
                      color: Colors.white,
                      borderRadius: BorderRadius.only(
                          bottomLeft: Radius.circular(0),
                          bottomRight: Radius.circular(0))),
                  // child: Image.network(tutorImage),
                ),
                Align(
                  alignment: Alignment.bottomCenter,
                  child: Container(
                    width: 60,
                    height: 60,
                    color: Colors.black,
                  ),
                )
              ],
            ),

Answer 1

您可以在堆栈内使用 Positioned.fill 和 Align:

Column(
  children: <Widget>[
    Stack(
      overflow: Overflow.visible,
      children: <Widget>[
        Container(
          width: MediaQuery.of(context).size.width,
          height: 170,
          decoration: BoxDecoration(
              color: Colors.white, borderRadius: BorderRadius.only(bottomLeft: Radius.circular(0), bottomRight: Radius.circular(0))),
          // child: Image.network(tutorImage),
        ),
        Positioned.fill(
          child: Align(
            alignment: Alignment.bottomCenter,
            child: Container(
              width: 60,
              height: 60,
              color: Colors.black,
            ),
          ),
        )
      ],
    ),
  ],
);