Performant SettingViews on iOS

Author: David Britch

src/Mobile/eShopOnContainers/eShopOnContainers.Core/ViewModels/SettingsViewModel.cs

@@ -13,14 +13,8 @@ namespace eShopOnContainers.Core.ViewModels
 {
     public class SettingsViewModel : ViewModelBase
     {
-        private string _titleUseAzureServices;
-        private string _descriptionUseAzureServices;
         private bool _useAzureServices;
-        private string _titleUseFakeLocation;
-        private string _descriptionUseFakeLocation;
         private bool _allowGpsLocation;
-        private string _titleAllowGpsLocation;
-        private string _descriptionAllowGpsLocation;
         private bool _useFakeLocation;
         private string _endpoint;
         private double _latitude;
@@ -48,21 +42,16 @@ public SettingsViewModel(ISettingsService settingsService, ILocationService loca
 
         public string TitleUseAzureServices
         {
-            get => _titleUseAzureServices;
-            set
-            {
-                _titleUseAzureServices = value;
-                RaisePropertyChanged(() => TitleUseAzureServices);
-            }
+            get { return !UseAzureServices ? "Use Mock Services" : "Use Microservices/Containers from eShopOnContainers"; }
         }
 
         public string DescriptionUseAzureServices
         {
-            get => _descriptionUseAzureServices;
-            set
+            get
             {
-                _descriptionUseAzureServices = value;
-                RaisePropertyChanged(() => DescriptionUseAzureServices);
+                return !UseAzureServices
+                    ? "Mock Services are simulated objects that mimic the behavior of real services using a controlled approach."
+                        : "When enabling the use of microservices/containers, the app will attempt to use real services deployed as Docker containers at the specified base endpoint, which will must be reachable through the network.";
             }
         }
 
@@ -72,30 +61,23 @@ public bool UseAzureServices
             set
             {
                 _useAzureServices = value;
-
                 UpdateUseAzureServices();
-
                 RaisePropertyChanged(() => UseAzureServices);
             }
         }
 
         public string TitleUseFakeLocation
         {
-            get => _titleUseFakeLocation;
-            set
-            {
-                _titleUseFakeLocation = value;
-                RaisePropertyChanged(() => TitleUseFakeLocation);
-            }
+            get { return !UseFakeLocation ? "Use Real Location" : "Use Fake Location"; }
         }
 
         public string DescriptionUseFakeLocation
         {
-            get => _descriptionUseFakeLocation;
-            set
+            get
             {
-                _descriptionUseFakeLocation = value;
-                RaisePropertyChanged(() => DescriptionUseFakeLocation);
+                return !UseFakeLocation
+                    ? "When enabling location, the app will attempt to use the location from the device."
+                        : "Fake Location data is added for marketing campaign testing.";
             }
         }
 
@@ -105,30 +87,23 @@ public bool UseFakeLocation
             set
             {
                 _useFakeLocation = value;
-
                 UpdateFakeLocation();
-
                 RaisePropertyChanged(() => UseFakeLocation);
             }
         }
 
         public string TitleAllowGpsLocation
         {
-            get => _titleAllowGpsLocation;
-            set
-            {
-                _titleAllowGpsLocation = value;
-                RaisePropertyChanged(() => TitleAllowGpsLocation);
-            }
+            get { return !AllowGpsLocation ? "GPS Location Disabled" : "GPS Location Enabled"; }
         }
 
         public string DescriptionAllowGpsLocation
         {
-            get => _descriptionAllowGpsLocation;
-            set
+            get
             {
-                _descriptionAllowGpsLocation = value;
-                RaisePropertyChanged(() => DescriptionAllowGpsLocation);
+                return !AllowGpsLocation
+                    ? "When disabling location, you won't receive location campaigns based upon your location."
+                        : "When enabling location, you'll receive location campaigns based upon your location.";
             }
         }
 
@@ -148,12 +123,10 @@ public string Endpoint
             set
             {
                 _endpoint = value;
-
                 if (!string.IsNullOrEmpty(_endpoint))
                 {
                     UpdateEndpoint();
                 }
-
                 RaisePropertyChanged(() => Endpoint);
             }
         }
@@ -164,9 +137,7 @@ public double Latitude
             set
             {
                 _latitude = value;
-
                 UpdateLatitude();
-
                 RaisePropertyChanged(() => Latitude);
             }
         }
@@ -177,9 +148,7 @@ public double Longitude
             set
             {
                 _longitude = value;
-
                 UpdateLongitude();
-
                 RaisePropertyChanged(() => Longitude);
             }
         }
@@ -190,9 +159,7 @@ public bool AllowGpsLocation
             set
             {
                 _allowGpsLocation = value;
-
                 UpdateAllowGpsLocation();
-
                 RaisePropertyChanged(() => AllowGpsLocation);
             }
         }
@@ -207,19 +174,11 @@ public bool AllowGpsLocation
 
         public ICommand ToggleAllowGpsLocationCommand => new Command(ToggleAllowGpsLocation);
 
-        public override Task InitializeAsync(object navigationData)
-        {
-            UpdateInfoUseAzureServices();
-            UpdateInfoFakeLocation();
-            UpdateInfoAllowGpsLocation();
-
-            return base.InitializeAsync(navigationData);
-        }
-
         private async Task ToggleMockServicesAsync()
         {
             ViewModelLocator.UpdateDependencies(!UseAzureServices);
-            UpdateInfoUseAzureServices();
+            RaisePropertyChanged(() => TitleUseAzureServices);
+            RaisePropertyChanged(() => DescriptionUseAzureServices);
 
             var previousPageViewModel = NavigationService.PreviousPageViewModel;
             if (previousPageViewModel != null)
@@ -243,7 +202,8 @@ private async Task ToggleMockServicesAsync()
         private void ToggleFakeLocationAsync()
         {
             ViewModelLocator.UpdateDependencies(!UseAzureServices);
-            UpdateInfoFakeLocation();
+            RaisePropertyChanged(() => TitleUseFakeLocation);
+            RaisePropertyChanged(() => DescriptionUseFakeLocation);
         }
 
         private async Task ToggleSendLocationAsync()
@@ -263,53 +223,10 @@ private async Task ToggleSendLocationAsync()
 
         private void ToggleAllowGpsLocation()
         {
-            UpdateInfoAllowGpsLocation();
-        }
-
-        private void UpdateInfoUseAzureServices()
-        {
-            if (!UseAzureServices)
-            {
-                TitleUseAzureServices = "Use Mock Services";
-                DescriptionUseAzureServices = "Mock Services are simulated objects that mimic the behavior of real services using a controlled approach.";
-            }
-            else
-            {
-                TitleUseAzureServices = "Use Microservices/Containers from eShopOnContainers";
-                DescriptionUseAzureServices = "When enabling the use of microservices/containers, the app will attempt to use real services deployed as Docker containers at the specified base endpoint, which will must be reachable through the network.";
-            }
-        }
-
-        private void UpdateInfoFakeLocation()
-        {
-            if (!UseFakeLocation)
-            {
-                TitleUseFakeLocation = "Use Real Location";
-                DescriptionUseFakeLocation = "When enabling location, the app will attempt to use the location from the device.";
-
-            }
-            else
-            {
-                TitleUseFakeLocation = "Use Fake Location";
-                DescriptionUseFakeLocation = "Fake Location data is added for marketing campaign testing.";
-            }
+            RaisePropertyChanged(() => TitleAllowGpsLocation);
+            RaisePropertyChanged(() => DescriptionAllowGpsLocation);
         }
 
-        private void UpdateInfoAllowGpsLocation()
-        {
-            if (!AllowGpsLocation)
-            {
-                TitleAllowGpsLocation = "GPS Location Disabled";
-                DescriptionAllowGpsLocation = "When disabling location, you won't receive location campaigns based upon your location.";
-            }
-            else
-            {
-                TitleAllowGpsLocation = "GPS Location Enabled";
-                DescriptionAllowGpsLocation = "When enabling location, you'll receive location campaigns based upon your location.";
-
-            }
-        }
-        
         private void UpdateUseAzureServices()
         {
             // Save use mocks services to local storage