权限插件

检查你的用户是否已授予或拒绝 iOS 和 Android 上的常见权限组的权限。

此外，你可以使用简单的跨平台异步/等待 API 来请求权限。

可用的 Nuget： https ：//www.nuget.org/packages/Plugin.Permissions 在这里输入链接描述 XAML

XAML

 <StackLayout Padding="30" Spacing="10">
      <Button Text="Get Location" Clicked="Button_OnClicked"></Button>
      <Label x:Name="LabelGeolocation"></Label>
      <Button Text="Calendar" StyleId="Calendar" Clicked="ButtonPermission_OnClicked"></Button>
      <Button Text="Camera" StyleId="Camera" Clicked="ButtonPermission_OnClicked"></Button>
      <Button Text="Contacts" StyleId="Contacts" Clicked="ButtonPermission_OnClicked"></Button>
      <Button Text="Microphone" StyleId="Microphone" Clicked="ButtonPermission_OnClicked"></Button>
      <Button Text="Phone" StyleId="Phone" Clicked="ButtonPermission_OnClicked"></Button>
      <Button Text="Photos" StyleId="Photos" Clicked="ButtonPermission_OnClicked"></Button>
      <Button Text="Reminders" StyleId="Reminders" Clicked="ButtonPermission_OnClicked"></Button>
      <Button Text="Sensors" StyleId="Sensors" Clicked="ButtonPermission_OnClicked"></Button>
      <Button Text="Sms" StyleId="Sms" Clicked="ButtonPermission_OnClicked"></Button>
      <Button Text="Storage" StyleId="Storage" Clicked="ButtonPermission_OnClicked"></Button>
      <Label Text=""/>
      
    </StackLayout>

码

bool busy;
        async void ButtonPermission_OnClicked(object sender, EventArgs e)
        {
            if (busy)
                return;

            busy = true;
            ((Button)sender).IsEnabled = false;

            var status = PermissionStatus.Unknown;
            switch (((Button)sender).StyleId)
            {
                case "Calendar":
                    status = await CrossPermissions.Current.CheckPermissionStatusAsync(Permission.Calendar);
                    break;
                case "Camera":
                    status = await CrossPermissions.Current.CheckPermissionStatusAsync(Permission.Camera);
                    break;
                case "Contacts":
                    status = await CrossPermissions.Current.CheckPermissionStatusAsync(Permission.Contacts);
                    break;
                case "Microphone":
                    status = await CrossPermissions.Current.CheckPermissionStatusAsync(Permission.Microphone);
                    break;
                case "Phone":
                    status = await CrossPermissions.Current.CheckPermissionStatusAsync(Permission.Phone);
                    break;
                case "Photos":
                    status = await CrossPermissions.Current.CheckPermissionStatusAsync(Permission.Photos);
                    break;
                case "Reminders":
                    status = await CrossPermissions.Current.CheckPermissionStatusAsync(Permission.Reminders);
                    break;
                case "Sensors":
                    status = await CrossPermissions.Current.CheckPermissionStatusAsync(Permission.Sensors);
                    break;
                case "Sms":
                    status = await CrossPermissions.Current.CheckPermissionStatusAsync(Permission.Sms);
                    break;
                case "Storage":
                    status = await CrossPermissions.Current.CheckPermissionStatusAsync(Permission.Storage);
                    break;
            }

            await DisplayAlert("Results", status.ToString(), "OK");

            if (status != PermissionStatus.Granted)
            {
                switch (((Button)sender).StyleId)
                {
                    case "Calendar":
                        status = (await CrossPermissions.Current.RequestPermissionsAsync(Permission.Calendar))[Permission.Calendar];
                        break;
                    case "Camera":
                        status = (await CrossPermissions.Current.RequestPermissionsAsync(Permission.Camera))[Permission.Camera];
                        break;
                    case "Contacts":
                        status = (await CrossPermissions.Current.RequestPermissionsAsync(Permission.Contacts))[Permission.Contacts];
                        break;
                    case "Microphone":
                        status = (await CrossPermissions.Current.RequestPermissionsAsync(Permission.Microphone))[Permission.Microphone];
                        break;
                    case "Phone":
                        status = (await CrossPermissions.Current.RequestPermissionsAsync(Permission.Phone))[Permission.Phone];
                        break;
                    case "Photos":
                        status = (await CrossPermissions.Current.RequestPermissionsAsync(Permission.Photos))[Permission.Photos];
                        break;
                    case "Reminders":
                        status = (await CrossPermissions.Current.RequestPermissionsAsync(Permission.Reminders))[Permission.Reminders];
                        break;
                    case "Sensors":
                        status = (await CrossPermissions.Current.RequestPermissionsAsync(Permission.Sensors))[Permission.Sensors];
                        break;
                    case "Sms":
                        status = (await CrossPermissions.Current.RequestPermissionsAsync(Permission.Sms))[Permission.Sms];
                        break;
                    case "Storage":
                        status = (await CrossPermissions.Current.RequestPermissionsAsync(Permission.Storage))[Permission.Storage];
                        break;
                }

                await DisplayAlert("Results", status.ToString(), "OK");

            }

            busy = false;
            ((Button)sender).IsEnabled = true;
        }

        async void Button_OnClicked(object sender, EventArgs e)
        {
            if (busy)
                return;

            busy = true;
            ((Button)sender).IsEnabled = false;

            try
            {
                var status = await CrossPermissions.Current.CheckPermissionStatusAsync(Permission.Location);
                if (status != PermissionStatus.Granted)
                {
                    if (await CrossPermissions.Current.ShouldShowRequestPermissionRationaleAsync(Permission.Location))
                    {
                        await DisplayAlert("Need location", "Gunna need that location", "OK");
                    }

                    var results = await CrossPermissions.Current.RequestPermissionsAsync(Permission.Location);
                    status = results[Permission.Location];
                }

                if (status == PermissionStatus.Granted)
                {
                    var results = await CrossGeolocator.Current.GetPositionAsync(10000);
                    LabelGeolocation.Text = "Lat: " + results.Latitude + " Long: " + results.Longitude;
                }
                else if (status != PermissionStatus.Unknown)
                {
                    await DisplayAlert("Location Denied", "Can not continue, try again.", "OK");
                }
            }
            catch (Exception ex)
            {

                LabelGeolocation.Text = "Error: " + ex;
            }

            ((Button)sender).IsEnabled = true;
            busy = false;
        }