flutter - 如何在复选框上显示AlertDialog单击

Question

单击AlertDialog后如何显示弹出窗口或Checkbox。我在onPressed中找不到类似CheckBox的东西。

Answer 1

Checkbox确实具有onChanged回调，该回调返回当前检查状态的值，简短示例:

bool _checked = false;

@override
Widget build(BuildContext context) {
  return Scaffold(
    body: Checkbox(
      value: _checked,
      onChanged: (checked) {
        setState(() => _checked = checked);
        if (_checked) {
          // show dialog if check box is checked
          showDialog(context: context, builder: (_) => AlertDialog(title: Text("Dialog")));
        }
      },
    ),
  );
}