sharee.bike-App/TINKLib/Services/Permissions/Essentials/Permissions.cs

using System.Threading.Tasks;
using Xamarin.Essentials;

namespace TINK.Services.Permissions.Essentials
{
    using XamPermission = Xamarin.Essentials.Permissions;
    using XamPermissionStatus = PermissionStatus;

    public class Permissions : ILocationPermission
    {
        /// <summary> Checks the permission status.</summary>
        /// <returns>Current permission status.</returns>
        public async Task<Status> CheckStatusAsync()
        {
            var status = await XamPermission.CheckStatusAsync<XamPermission.LocationWhenInUse>();
            if (status == XamPermissionStatus.Granted)
            {
                return Status.Granted;
            }

            if (status == XamPermissionStatus.Denied 
                && DeviceInfo.Platform == DevicePlatform.iOS)
            {
                // Prompt the user to turn on in settings
                // On iOS once a permission has been denied it may not be requested again from the application
                return Status.DeniedRequiresSettingsUI;
            }

            if (XamPermission.ShouldShowRationale<XamPermission.LocationWhenInUse>())
            {
                // Prompt the user with additional information as to why the permission is needed
                return Status.Denied;
            }

            switch (status)
            {
                case XamPermissionStatus.Unknown:
                case XamPermissionStatus.Denied: // Map Denied to unknown because "denied means user did not allow access to location".
                    return Status.Unknown;

                default:
                    // Comprises: 
                    // - XamPermissionStatus.Restricted:
                    // - XamPermissionStatus.Disabled
                    // Perission XamPermissionStatus.Granted is handled above.
                    return Status.DeniedRequiresSettingsUI;
            }
        }

        /// <summary> Requests location permission.</summary>
        /// <returns>Permission status after request.</returns>
        public async Task<Status> RequestAsync()
        {
            switch (await XamPermission.RequestAsync<XamPermission.LocationWhenInUse>())
            {
                case XamPermissionStatus.Unknown:
                    return Status.Unknown;

                case XamPermissionStatus.Denied:
                    return Status.Denied;

                case XamPermissionStatus.Granted:
                    return Status.Granted;

                default:
                    // Comprises: 
                    // - XamPermissionStatus.Restricted:
                    // - XamPermissionStatus.Disabled
                    return Status.DeniedRequiresSettingsUI;
            }
        }

        /// <summary> Opens app settings dialog.</summary>
        public bool OpenAppSettings()
        {
            AppInfo.ShowSettingsUI();
            return true;
        }
    }
}