可滚动的 Alertdialog Flutter

Scrollable Alertdialog Flutter

我正在努力使 Flutter 中的警报对话框可滚动。我尝试了几种方法,到目前为止,这是效果最好的一种:

Widget _buildPopupDialog(BuildContext context) {
  List<IconData> _iconsTable = [
      Icons.build,
      Icons.format_paint,
      Icons.assignment,
      Icons.group_work,
      Icons.home,
      Icons.feedback,
      ...
    ];

  return new AlertDialog(
    title: const Text('Popup example'),
    content: Column(
    mainAxisSize: MainAxisSize.min,
    crossAxisAlignment: CrossAxisAlignment.stretch,
    children: <Widget>[
      SingleChildScrollView(
        child: Column(
        mainAxisSize: MainAxisSize.min,
        crossAxisAlignment: CrossAxisAlignment.stretch,
         children: <Widget>[
           new Column(
                children: new List.generate(26, (int index) {
                  return new Positioned(
                    child: new TableButtons(
                        iconData: _iconsTable[index]),
                  );
               }),
           ),
         ],
       ),
     ),
  ],
),

目前,图标正在显示,但没有滚动。我收到的错误消息是:“A RenderFlex 在底部溢出 170 像素。”我想我必须使用 ListView 但我不确定在哪里添加它,因为它会导致错误。如有任何帮助,我们将不胜感激!

您有许多仅包含 1 个 child 的列,因此您必须稍微清理一下代码:

Widget _buildPopupDialog(BuildContext context) {
  List<IconData> _iconsTable = [
      Icons.build,
      Icons.format_paint,
      Icons.assignment,
      Icons.group_work,
      Icons.home,
      Icons.feedback,
      ...
    ];

  return new AlertDialog(
    title: const Text('Popup example'),
    content: SingleChildScrollView(
        child: new Column(
          children: new List.generate(26, (int index) {
            return new Positioned(
              child: new TableButtons(
                iconData: _iconsTable[index]),
                );
            }),
          ),
),

我认为您使用了不需要的 Column() 小部件。

试试这个。

return AlertDialog(
  title: const Text('Popup example'),
  content: SingleChildScrollView(
    child: new Column(
      children: new List.generate(50, (int index) {
        return new Positioned(
          child: Icon(
            Icons.camera
          ),
        );
      }),
    ),
  ),
);