Slider in settings to adjust days of forecast loaded. Settings are saved and loaded

lib/main.dart

@@ -1,4 +1,5 @@
 import 'package:flutter/material.dart';
+import 'package:shared_preferences/shared_preferences.dart';
 import 'package:wetter/components/compact_weather_data.dart';
 import 'package:wetter/components/main_menu.dart';
 import 'package:wetter/models/daily_weather_model.dart';
@@ -14,13 +15,23 @@ class MyApp extends StatefulWidget {
 }
 
 class _MyAppState extends State<MyApp> {
+  SharedPreferences? prefs;
+  int _daysToLoad = 7;
   late Future<List<DailyWeatherModel>> dailyWeather;
 
   @override
   void initState() {
     super.initState();
-    dailyWeather = BrightSkyAPI.fetchForecastForTimeRange(
-        DateTime.now(), DateTime.now().add(const Duration(days: 7)));
+    initializePreferences();
+    dailyWeather =
+        BrightSkyAPI.fetchForecastForTimeRange(DateTime.now(), _daysToLoad);
+  }
+
+  Future<void> initializePreferences() async {
+    prefs = await SharedPreferences.getInstance();
+    setState(() {
+      _daysToLoad = prefs!.getInt("daysToLoad") ?? 7;
+    });
   }
 
   @override
@@ -44,9 +55,9 @@ class _MyAppState extends State<MyApp> {
               onRefresh: () {
                 return Future(() {
                   setState(() {
+                    _daysToLoad = prefs?.getInt("daysToLoad") ?? 7;
                     dailyWeather = BrightSkyAPI.fetchForecastForTimeRange(
-                        DateTime.now(),
-                        DateTime.now().add(const Duration(days: 7)));
+                        DateTime.now(), _daysToLoad);
                   });
                 });
               },
@@ -54,7 +65,8 @@ class _MyAppState extends State<MyApp> {
                 physics: const AlwaysScrollableScrollPhysics(),
                 child: Center(
                   child: FutureBuilder<List<DailyWeatherModel>>(
-                    future: dailyWeather,
+                    future: BrightSkyAPI.fetchForecastForTimeRange(
+                        DateTime.now(), _daysToLoad),
                     builder: (context, snapshot) {
                       if (snapshot.hasData) {
                         return Column(