pop static method
- bool? animated,
Removes the topmost Flutter instance, presenting what was before it.
On Android, removes this activity from the stack and returns to the previous activity.
On iOS, calls popViewControllerAnimated: if the root view
controller is a UINavigationController, or
dismissViewControllerAnimated:completion: if the top view
controller is a FlutterViewController.
The optional animated parameter is ignored on all platforms
except iOS where it is an argument to the aforementioned
methods.
This method should be preferred over calling dart:io's exit
method, as the latter may cause the underlying platform to act
as if the application had crashed.
Implementation
static Future<void> pop({bool? animated}) async {
  await SystemChannels.platform.invokeMethod<void>('SystemNavigator.pop', animated);
}