Method is not defined in other class

Question

Because I want to call the setState Method in the class "EditProfilePage", I had to change it to a statefulWidget:

class EditProfilePage extends StatefulWidget {

  @override
  _EditProfilePageState createState() => _EditProfilePageState();

}

class _EditProfilePageState extends State<EditProfilePage> {

  TextEditingController nameController = new TextEditingController();
  TextEditingController bioController = new TextEditingController();
   File file;

       .
       .
       .

     applyChanges() {
    Firestore.instance
        .collection('insta_users')
        .document(currentUserModel.id)
        .updateData({
      "displayName": nameController.text,
      "bio": bioController.text

    });
  }
 }

But now, my class 'Profile_page' seems to miss the method "applyChanges()" of "EditProfilePage" and throws following error:

The method 'applyChanges' isn't defined for the class 'EditProfilePage'.

Here is the method in 'Profile_Page', which calls applyChanges() from 'EditProfilePage':

editProfile() {
    EditProfilePage editPage = new EditProfilePage();

    Navigator.of(context)
        .push(new MaterialPageRoute<bool>(builder: (BuildContext context) {
      return new Center(
        child: new Scaffold(
            appBar: new AppBar(
              leading: new IconButton(
                icon: new Icon(Icons.close),
                onPressed: () {
                  Navigator.maybePop(context);
                },
              ),
              title: new Text('Edit Profile',
                  style: new TextStyle(
                      color: Colors.black, fontWeight: FontWeight.bold)),
              elevation: 1.0,
              backgroundColor: Colors.white,
              actions: <Widget>[
                new IconButton(
                    icon: new Icon(
                      Icons.check,
                      color: Colors.blueAccent,
                    ),
                    onPressed: () {
                      editPage.applyChanges();
                      Navigator.maybePop(context);
                    })

Any suggestions on how to fix this problem? I did not forget to import.

Btw I am very new to flutter and just trying to understand dart. Best Regards!

Possible duplicate of [call method in one stateful widget from another stateful widget - Flutter](https://stackoverflow.com/questions/51029655/call-method-in-one-stateful-widget-from-another-stateful-widget-flutter) — mirkancal, Mar 25 '19 at 11:56

score 0 · Accepted Answer · answered Mar 25 '19 at 11:54

You should make significant change to your EditProfilePage structure by moving the applyChanges function away from _EditProfilePageState class:

   class EditProfilePage extends StatefulWidget {

   @override
   _EditProfilePageState createState() => _EditProfilePageState();

     static void applyChanges(TextEditingController nameController, TextEditingController bioController) {
      Firestore.instance.collection('insta_users').document(currentUserModel.id).updateData({
      "displayName": nameController.text,
      "bio": bioController.text
      });
     }

   }

Then call applyChanges() function from inside the function editProfile() :

  EditProfilePage.applyChanges(nameController, bioController);

But you have to make your TextEditingController objects which contain the name and bio visible to the context you are calling from. One way I would suggest is to make them global by defining them under the import section of your code which will enable any inner class to use them.

Method is not defined in other class

1 Answers1