shared_pref_cubit

yudiwibisono

Jun 3rd, 2023 (edited)

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import 'package:flutter/material.dart';
import 'package:shared_preferences/shared_preferences.dart';
import 'package:flutter_bloc/flutter_bloc.dart';
void main() => runApp(const MyApp());
class MyApp extends StatelessWidget {
const MyApp({Key? key}) : super(key: key);
@override
Widget build(BuildContext context) {
return MaterialApp(
home: BlocProvider(
create: (_) => UserCubit(),
child: const HalamanUtama(),
),
);
}
}
//model berisi data/state
class UserModel {
String userId;
UserModel({required this.userId}); //constructor
}
//cubit untuk userModel
class UserCubit extends Cubit<UserModel> {
//UserCubit(super.initialState);
UserCubit() : super(UserModel(userId: "")) {
//penting: inisialiasi
ambilDataUser();
}
Future<void> ambilDataUser() async {
final prefs = await SharedPreferences.getInstance();
emit(UserModel(userId: prefs.getString('userId') ?? ""));
}
//simpan ke sharepref
Future<void> simpanDataUser() async {
String user = "budiWati";
final prefs = await SharedPreferences.getInstance();
await prefs.setString('userId', user);
emit(UserModel(userId: user));
}
//hapus data sharedpref
Future<void> hapusDataUser() async {
final prefs = await SharedPreferences.getInstance();
await prefs.remove('userId');
emit(UserModel(userId: ""));
}
}
class HalamanUtama extends StatelessWidget {
const HalamanUtama({Key? key}) : super(key: key);
@override
Widget build(BuildContext context) {
return MaterialApp(home: Scaffold(body: Center(
child: BlocBuilder<UserCubit, UserModel>(builder: (context, user) {
if (user.userId == "") {
return Center(
child:
Column(mainAxisAlignment: MainAxisAlignment.center, children: [
const Text("user belum login"),
ElevatedButton(
onPressed: () {
context.read<UserCubit>().simpanDataUser();
},
child: Text("Login"),
),
]));
} else {
return (Center(
child:
Column(mainAxisAlignment: MainAxisAlignment.center, children: [
Text("user id: ${user.userId}"),
ElevatedButton(
onPressed: () {
context.read<UserCubit>().hapusDataUser();
},
child: Text("Logout"),
),
])));
}
}))));
}
}

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