Add locations and save them, remove locations and delete them

lib/screens/locations.dart

@@ -24,7 +24,11 @@ class _LocationsState extends State<Locations> {
     });
   }
 
-  void deleteLocation(String name) {}
+  void deleteLocation(String name) {
+    setState(() {
+      locations = UserPreferences.deleteLocation(name);
+    });
+  }
 
   @override
   Widget build(BuildContext context) {

lib/screens/main_weather_view.dart

@@ -1,5 +1,5 @@
 import 'package:flutter/material.dart';
-import 'package:shared_preferences/shared_preferences.dart';
+import 'package:wetter/services/user_preferences.dart';
 
 import '../components/compact_weather_data.dart';
 import '../models/daily_weather_model.dart';
@@ -17,8 +17,7 @@ class MainWeatherView extends StatefulWidget {
 
 class _MainWeatherViewState extends State<MainWeatherView>
     with AutomaticKeepAliveClientMixin<MainWeatherView> {
-  SharedPreferences? prefs;
-  int _daysToLoad = 7;
+  int _daysToLoad = UserPreferences.preferences!.getInt("daysToLoad") ?? 7;
   late Future<List<DailyWeatherModel>> dailyWeather;
 
   @override
@@ -27,18 +26,10 @@ class _MainWeatherViewState extends State<MainWeatherView>
   @override
   void initState() {
     super.initState();
-    initializePreferences();
     dailyWeather = BrightSkyAPI.fetchForecastForTimeRange(
         DateTime.now(), _daysToLoad, widget.lat, widget.lon);
   }
 
-  Future<void> initializePreferences() async {
-    prefs = await SharedPreferences.getInstance();
-    setState(() {
-      _daysToLoad = prefs!.getInt("daysToLoad") ?? 7;
-    });
-  }
-
   @override
   Widget build(BuildContext context) {
     super.build(context);
@@ -46,7 +37,8 @@ class _MainWeatherViewState extends State<MainWeatherView>
         onRefresh: () {
           return Future(() {
             setState(() {
-              _daysToLoad = prefs?.getInt("daysToLoad") ?? 7;
+              _daysToLoad =
+                  UserPreferences.preferences!.getInt("daysToLoad") ?? 7;
               dailyWeather = BrightSkyAPI.fetchForecastForTimeRange(
                   DateTime.now(), _daysToLoad, widget.lat, widget.lon);
             });