您可以传递像Navigator.of（context）.pop（'something '）这样的数据，然后在.then中接收其值

showDialog(context: context, builder: (context) => AlertDialog(
    title: Text('Grant access'),
    actions: [
      OutlinedButton(onPressed: (){
          Navigator.of(context).pop('Button A');
          /// Some more code
      }, child: Text('Grant access')),

      OutlinedButton(onPressed: () {
        Navigator.of(context).pop('Button B');
      }, child: Text('Cancel'))
    ],
  )).then((value) async {
    // Check if the value returned from showDialog is null
  if (value == null) {
    // If value is null, it means that the dialog was closed by tapping outside
    print('Dialog closed by tapping outside');
  } else {
    // If value is not null, it means that the dialog was closed with a value
    // Print the value for debugging purposes
    print('Dialog closed with value: $value');
  }
});

但是我建议你创建一个带回调的CustomDialog类，这样应该会更好。

您可以将await关键字与showDialog()函数一起使用，然后检查该函数返回的值以确定消除方法。

var result = await showDialog(
  context: context,
  builder: (context) => AlertDialog(
    title: Text('Grant access'),
    actions: [
      OutlinedButton(
        child: Text('Grant access'),
        onPressed: () {
          Navigator.of(context).pop('Granted');
        },
      ),
      OutlinedButton(
        child: Text('Cancel'),
        onPressed: () {
          Navigator.of(context).pop('Cancelled');
        },
      ),
    ],
  ),
);

if (result == 'Granted') {
  // run code for dismissal by tapping button A
} else if (result == 'Cancelled') {
  // run code for dismissal by tapping button B or outside barrier
} else {
  // run code for dismissal by other means (e.g. back button)
}