If I am using WillPopScope to overwrite the BackButton behavior with a new route, it works fine. But on iOS, the automatic 'SwipeBack' gesture is not working any more. How can I set the SwipeBack gesture on iOS to push the current screen to the page with the class 'StartScreen'?
WillPopScope(onWillPop: (){
Navigator.push(
context,
MaterialPageRoute(
builder: (context) => StartScreen(),
),
);
}
This may be a very late answer, but at the moment there is no clear opportunity to listen to this gesture
You can achieve the call to onWillPop when you press the back button, and at the same time do not block the gesture if you make a descendant class of the ModalRoute class (or its descendants, such as MaterialPageRoute) and override the hasScopedWillPopCallback method (however, the gesture will not call onWillPop)
WillPopScope is not meant to affect navigation (I.e.: push a route on the navigator). It is meant for vetoing (preventing) navigation away from the current route when you don't want the user to navigate away. (For example, when it might result in data loss.)
Try CupertinoWillPopScope, as it allows you to conditionally veto the back navigation. So you can only block it when there's an actual need.
Related
I'm currently developing an app which uses the flutter_split_view plugin to automatically display split view. There's one main annoyance, though, pressing the Android's native back button from the child screen (i.e. the right widget) simply closes the app.
I have tried using WillPopScope to call SplitView.of(context) on the child screen, because the SplitView constructor does not accept external controllers (e.g. TabController for tabs) which I could call to redirect the back button calls to the SplitView instead.
import 'package:flutter/material.dart';
import 'package:flutter_split_view/flutter_split_view.dart';
class ChildPage extends StatelessWidget {
#override
Widget build(BuildContext context) {
SplitViewState splitView = SplitView.of(context);
return WillPopScope(
onWillPop: () async {
splitView.pop();
return false;
},
child: Scaffold(...),
);
}
}
Is there a way to solve this?
You can use the WillPopScope widget to capture the back button press event, and then use the splitView.pop() method to navigate to the previous screen, instead of closing the app.
By wrapping the Scaffold widget with a WillPopScope widget, you can intercept the back button press event, and then use the splitView.pop() method to navigate to the previous screen. The onWillPop callback should return Future, returning false will prevent the back button from doing its default action, in this case close the app. And that way you can redirect the back button calls to the SplitView instead.
This should work as expected if implemented correctly. However, you should test it on the actual device to make sure the behavior is the one you expect.
Don't think that split_view can help you split the current page into several single running StateFullWidget's. All the pages you see are only controlled by the context of the current page. So, the pop you reference in the subclassed widget will only apply to the current page. If the current page is the last page, there will be no page after running pop, so the program exits
I have an app with bottom navbar. I can navigate between pages through the navbar. My problem is when i go to another page (not a button for this page on navbar) navbar disappears. I used that code below when click button and go to another page. But as i said navbar dissappears. I want navbar always stay.
Navigator.push(
context,
MaterialPageRoute(
builder: (context) => ProgrammingScreen()));
I tried PageView widget but i could'nt navigate pages from buttons. How can i solve this problem?
One option is to all those screens be in the page view widget.
But another thing you can do is put the exact same bottom nav bar in the new pushed screen and if the user selects an option. You can use Navigator.pop() and then navigate to the pageView with the selected option
I'm trying to make a turn by turn navigation app with flutter but I have a problem. I am using the Mapbox navigation package and I want the navigation screen to remain in the screen where I called it, not to open another screen. How can this be achieved?
if you are trying to navigate based on markers, you can do that using the ontap method inside the marker function.
onTap: (){
Navigator.push(context, MaterialPageRoute(builder: (context)=>Page()),);
}
you can do the navigation replacing the Page to which ever widget you want.
How do you reuse Flutter views created with MaterialPageRoute builder? Currently new views are created in the widget tree whenever Navigator.pushReplacementNamed is called. e.g. The following code will create 4 views in the widget tree:
Navigator.pushNamed(context, 'page1');
Navigator.pushNamed(context, 'page2');
Navigator.pushNamed(context, 'page1');
Navigator.pushNamed(context, 'page2');
I would prefer only two views in the widget tree - a single instance of both page1 and page2.
Is this possible?
push() and pushNamed() method recreate page over the current page you should use pushReplacement() and pushReplacementNamed() methods. However in this way you cannot use automatic back feature you should use pop() method or you should again some of push methods because when you you use pushReplacement() and pushReplacementNamed() methods previous page destroy and you should re-create manually.
happy new year! :)
I have three tabs, each holding a stateful widget. The data presented in tab #2 could be changed by the user within tab #3. Thus, when moving back from tab #3 to tab #2, I need to call an update() method within tab #2. Is there a stateful widget method that gets fired everytime the widget gets visible? If not, what opporutinites do I have in order to achieve this?
Best, Nico
The reason it's not updating is due to the widget already been rendered and now cached until the user exits the app. You can try numerous methods to make this work. For example, VoidCallBack method, adding an async function or leaving a blank setState in the initState itself. At the end of the day, it depends on how your app works. If you have a custom tabbar I'd recommend using the VoidCallBack method or maybe adding an async function which will be called before you return a render. Regardless these methods should work.