wetterApp/lib/components/settings_form.dart

import 'package:flutter/material.dart';
import 'package:wetter/services/user_preferences.dart';

class SettingsForm extends StatefulWidget {
  const SettingsForm({Key? key}) : super(key: key);

  @override
  SettingsFormState createState() => SettingsFormState();
}

class SettingsFormState extends State<SettingsForm> {
  int _daysToLoad = 7;
  final _formKey = GlobalKey<FormState>();

  @override
  void initState() {
    _daysToLoad = UserPreferences.preferences!.getInt("daysToLoad") ?? 7;
    super.initState();
  }

  @override
  Widget build(BuildContext context) {
    return Form(
        key: _formKey,
        child: Column(
          children: [
            Slider(
              value: _daysToLoad.toDouble(),
              min: 1.0,
              max: 14.0,
              divisions: 13,
              label: _daysToLoad.round().toString(),
              onChanged: (double value) {
                setState(() {
                  _daysToLoad = value.round();
                  UserPreferences.preferences!
                      .setInt("daysToLoad", _daysToLoad);
                });
              },
            )
          ],
        ));
  }
}