I am confused between Xamarin.Forms and Xamarin native.

So what are the technical positives and negatives of using Xamarin.Forms over Xamarin Native?

What is the difference between Xamarin.Forms and Xamarin Native?

Is there any way using Xamarin Forms (not Android or iOS specific) to have a pop-up, like Android does with Toast, that needs no user interaction and goes away after a (short) period of time?

From searching around all I'm seeing are alerts that need user clicks to go away.

Toast equivalent for Xamarin Forms

I am starting to learn Xamarin, so I am a noob.

I am trying to show a SnackBar or Toast using the Xamarin.CommunityToolkit.Extensions NuGet Package.

I can't seem to find a way to show a Toast or Snackbar in the ViewModel. The only way I found to display it was in the View.xaml.cs.

I created a method ShowToast() in my View.xaml.cs. I would like to know how do I call the ShowToast() method in my ViewModel.cs?

Call method in View from ViewModel

I am creating a xamarin form app which require user location after every 10 meter. I am able to get location when app is running in foreground but unable to get location when app get into background 

You can do it with device timer. The timer will run periodically & will check for location updates and notify if location updated. I have used Xam.Plugins.Notifier to generate local notification on location update.

public partial class MainPage : ContentPage
{
    Location oldLocation = null;
    CancellationTokenSource cts;
    public MainPage()
    {
        InitializeComponent();
        Device.StartTimer(TimeSpan.FromSeconds(10), () =>
        {
            GetCurrentLocation();
            return true;
        });
    }

    protected async override void OnAppearing()
    {
        base.OnAppearing();
        await GetCurrentLocation();
    }

    async Task GetCurrentLocation()
    {
        try
        {
            var request = new GeolocationRequest(GeolocationAccuracy.Medium, TimeSpan.FromSeconds(10));
            cts = new CancellationTokenSource();
            var location = await Geolocation.GetLocationAsync(request, cts.Token);

            if (location != null)
            {
                Debug.WriteLine($"Latitude: {location.Latitude}, Longitude: {location.Longitude}, Altitude: {location.Altitude}");
                if (oldLocation == null)
                {
                    oldLocation = location;
                    map.MoveToRegion(MapSpan.FromCenterAndRadius(
                   new Position(location.Latitude, location.Longitude), Distance.FromMiles(0.3)));
                }
                if (location.Latitude != oldLocation.Latitude || location.Longitude != oldLocation.Longitude)
                {
                    map.MoveToRegion(MapSpan.FromCenterAndRadius(
                   new Position(location.Latitude, location.Longitude), Distance.FromMiles(0.3)));

                    oldLocation = location;
                    double zoomLevel = 0.5;
                    double latlongDegrees = 360 / (Math.Pow(2, zoomLevel));
                    if (map.VisibleRegion != null)
                    {
                        map.MoveToRegion(new MapSpan(map.VisibleRegion.Center, latlongDegrees, latlongDegrees));
                    }

                    var placemarks = await Geocoding.GetPlacemarksAsync(location.Latitude, location.Longitude);
                    var placemark = placemarks?.FirstOrDefault();
                    if (placemark != null)


                    {
                        var geocodeAddress =
                            $"AdminArea:       {placemark.AdminArea}\n" +
                            $"CountryCode:     {placemark.CountryCode}\n" +
                            $"CountryName:     {placemark.CountryName}\n" +
                            $"FeatureName:     {placemark.FeatureName}\n" +
                            $"Locality:        {placemark.Locality}\n" +
                            $"PostalCode:      {placemark.PostalCode}\n" +
                            $"SubAdminArea:    {placemark.SubAdminArea}\n" +
                            $"SubLocality:     {placemark.SubLocality}\n" +
                            $"SubThoroughfare: {placemark.SubThoroughfare}\n" +
                            $"Location :       {placemark.Location}\n" +
                            $"Thoroughfare:    {placemark.Thoroughfare}\n";

                        Debug.WriteLine(geocodeAddress);
                    }
                    
                    CrossLocalNotifications.Current.Show("Location Updated", "You checked in to " + placemark.FeatureName + " " + placemark.Locality + " " + placemark.SubLocality, 101, DateTime.Now.AddSeconds(5));
                }
            }
        }
        catch (FeatureNotSupportedException)
        {
            // Handle not supported on device exception
        }
        catch (FeatureNotEnabledException)
        {
            // Handle not enabled on device exception
        }
        catch (PermissionException)
        {
            // Handle permission exception
        }
        catch (Exception)
        {
            // Unable to get location
        }
    }
}

Background Location Tracking for Android with Xamarin.Forms

I want to change placeholder position on focus in entry, place holder slide to up on top of the entry border with animation linear by using custom renderer, and can be avail to set margin and padding for placeholde 

how can i change placeholder position in xamarin from on focus

In the application I developed, the navigation bar at the bottom of the screen, changes its color between black and white depending on the theme selected by the user. It worked perfectly all this time until I updated the software to iOS 15. Now, even if the user changes it to dark mode, the navigation bar alone stays white (supposed to turn black). Any idea why this happens? This issue only persists in iOS platform. 

After the iOS 15 update, there have been some changes to the navigation bar appearance in Xamarin.Forms applications. If you are experiencing issues with the navigation bar color in Xamarin.Forms on iOS after the iOS 15 update, here are a few things you can try:

Ensure you have updated your Xamarin.Forms and related NuGet packages to the latest version. Xamarin.Forms often release updates to address compatibility issues with new iOS versions.

Check if your code explicitly sets the navigation bar color. In iOS 15, there have been changes to the way navigation bar colors are handled. If you are explicitly setting the navigation bar color in your code, you may need to update it to align with the changes in iOS 15.

For example, instead of using UINavigationBar.Appearance.BarTintColor, you can use UINavigationBar.Appearance.BackgroundColor to set the background color of the navigation bar.

Consider using the Xamarin.Forms Shell navigation system. Shell provides a simplified way to handle navigation and has built-in support for customizing the appearance of the navigation bar.

If the issue persists, it might be worth checking the Xamarin.Forms GitHub repository or Xamarin forums for any reported issues or workarounds specific to iOS 15. Community members and Xamarin.Forms developers often share their experiences and solutions for compatibility issues.

Remember to thoroughly test your app on different devices and iOS versions to ensure compatibility and resolve any potential issues.

Navigation bar colour change issue in Xamarin.forms in iOS platform after iOS 15 update

I am planning to integrate AWS amplify in my existing Xamarin forms ? Is there any solution or reference available ? 

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