Flutter GETX: How to remove Initialized Controller every time we navigate to other page/routes

Question

newbie here. How do I re-run onInit() every time I push back to my screen? onInit() runs only once but navigating back to a previous screen does not delete the controller which was initialized (FetchData) hmmm..

I'm only using Get.back() every time I want to pop page, and Get.toNamed() every time I want to navigate on a named route

the only thing I want to happen is to delete the Initialized controller (FetchData) every time I pop the page but I have no Idea how to do it.

my GetxController

class FetchData extends GetxController {
    RxList items = [].obs;
    @override
    onInit() {
      fetchData();
      super.onInit();
    }
    
    Future<void> fetchData() async {
     var result = await http.get("api.url");
     items.value = result.body;
    }
}

Thanks in advance!

Not enough information is given. You need to also provide your bindings and view snippets to get proper help — S. M. JAHANGIR, Apr 25 '21 at 10:21

score 9 · Answer 1 · answered Nov 18 '21 at 03:46

9

You can use:

Get.delete<FetchData>();

answered Nov 18 '21 at 03:46

Airshu

155
1
5

Bilal Şimşek · Answer 2 · 2022-04-08T10:36:52.310

7

When I logout Get.off, Get.offUntil, Get.offAndToNamed methods doesnt remove my GetXController from memory.

then I tried below code and everything works fine.

 Get.offUntil(GetPageRoute(page: () => Login()), ModalRoute.withName('toNewLogin') );
   
     Timer(Duration(milliseconds: 300), ()=>Get.delete<MainPageController>());

edited Apr 08 '22 at 10:36

answered Aug 26 '21 at 16:12

Bilal Şimşek

5,453
2
19
33

score 2 · Answer 3 · edited Aug 16 '21 at 00:10

The onInit is only called once. You can use another method to run when back from another screen, for example, when call the new screen you can await until it closes and then call your method again:

//go to new screen
await Get.toNamed(screenName);
//after run my method
controller.fectchData();

if you want call the method only in some cases you can pass a bool back to ask if needs reload:

Get.back(result: true);

and in the screen that called:

//go to new screen
final result = await Get.toNamed(screenName);
    
if(result != null && result == true)//after run only if needed
controller.fectchData();

score 2 · Answer 4 · answered Mar 26 '22 at 17:12

You cannot put method fetchData() on super.onInit(). When you use Get.offAllName(), Get.offAndToName(), Get.offAll(), etc... Method fetchData() is still kept in memory => Cannot dispose or close it.

FIX:

class FetchData extends GetxController {
   RxList items = [].obs;
   @override
   onInit() {
     super.onInit(); // <--- swap code here
     fetchData(); // <--- swap code here
   }

   Future<void> fetchData() async {
      var result = await http.get("api.url");
      items.value = result.body;
   }
}

score 1 · Answer 5 · answered May 19 '21 at 22:17

1

You can use

Get.offAndToNamed(url)

answered May 19 '21 at 22:17

Şerefcan Oğuz

119
8

3

While this code snippet may solve the question, [including an explanation](http://meta.stackexchange.com/questions/114762/explaining-entirely-code-based-answers) really helps to improve the quality of your post. Remember that you are answering the question for readers in the future, and those people might not know the reasons for your code suggestion. – Jeroen Steenbeeke May 20 '21 at 07:01

score 1 · Answer 6 · answered Sep 25 '22 at 12:34

1

You can use

Get.deleteAll();

This will remove all the Initialized controllers instances from your memory.

answered Sep 25 '22 at 12:34

Chand Abdullah

429
6
13

score 0 · Answer 7 · answered Oct 21 '21 at 19:32

0

Use Get.offAllNamed. It will remove all controllers and create only the final destination route controller. Tested with get: ^4.3.8

        Get.offAllNamed("your final route");

answered Oct 21 '21 at 19:32

Ares91

506
2
8
27

score 0 · Answer 8 · answered Dec 21 '22 at 08:54

The simple answer is Get.delete<FetchData>(); if you had created like Get.put(FetchData())

But If you have created like Get.put(FetchData(), permanent: true); or by LazyPut you can delete that by forcing Get.delete<FetchData>(force: true);

I hope this helps you.

Flutter GETX: How to remove Initialized Controller every time we navigate to other page/routes

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