How to access iOS UserDefaults stored data in Flutter SharedPrefrences

Question

I have an iOS app already on Store, Now planning to replace it with Flutter with new version release.

I want to get access native app's UserDefaults data in Flutter code.

Using the way suggested in Flutter docs I m getting null value. What I have tried is:

In my pubspec.yaml file :

dependencies:
  shared_preferences: ^0.5.12+4

Im my home.dart class file I'm importing header :

import 'package:shared_preferences/shared_preferences.dart';

And this is how I m trying to access data stored in iOS app from native app, I m using same bundle ID (Package ID) in flutter project to overwrite the app and it is successfully overwriting.

@override
void initState() {
    super.initState();
    getFromLocalMemory('user').then((value) =>
      userInfo = value
  );
}



Future<String> getFromLocalMemory(String key) async {
    SharedPreferences prefs = await SharedPreferences.getInstance();
    String user = prefs.getString(key);
    return user;
}

It always returns null. While 'user' key has data when getting from iOS native app.

M Zubair Shamshad, have you found solution? – Sergio Apr 21 '21 at 08:54 — Sergio, Apr 21 '21 at 08:54
@Sergey using platform channels – M Zubair Shamshad Apr 21 '21 at 10:59 — M Zubair Shamshad, Apr 21 '21 at 10:59

score 3 · Answer 1 · answered Apr 23 '21 at 16:34

We can use existing plugin native_shared_preferences. It allows us to access native SharedPreferences on Android and UserDefaults on iOS. Sample code to read a value by key "SomeKey":

final someKey = "SomeKey";
var prefs = await NativeSharedPreferences.getInstance();
if (prefs.containsKey(someKey)) {
    print("Value for SomeKey: ${prefs.get(someKey)}");
}

score 1 · Accepted Answer · answered Feb 17 '21 at 04:26

1

In that case, I suggest you use platform channel method

platform channels

iOS doesn't seem to allow flutter framework to access NSUserDefaults, when it didn't create it from the beginning,..

I hope it will work for you.

answered Feb 17 '21 at 04:26

Sadeny Alpha

386
1
7

thank you, I will check this in detail and surely update here. – M Zubair Shamshad Feb 17 '21 at 05:24

How to access iOS UserDefaults stored data in Flutter SharedPrefrences

2 Answers2