首先，我做了一些研究，但只为Swift找到了一个原生的iOS答案。
完整的警告说：

This method can cause UI unresponsiveness if invoked on the main thread. Instead, consider waiting for the `-locationManagerDidChangeAuthorization:` callback and checking `authorizationStatus` first.

我读到过这可能是因为我使用的是异步，离开调用;以及.我已经阅读了有关的iOS版本也：StackOverFlow/73805219如何在Xamarin表单中修复此问题？
我必须说我正在使用#Xamarin.Forms.Essentials中的Geolocalization来获取我通过#MessaginCenter发送的异步函数中的当前经度和纬度。

async Task StoringNoteAsync()
        {
            Location location = await _geolocation.GetCurrentLocation();

            NoteSelected = NoteSelected ?? new Note();

            NoteSelected.Title      = Title;
            NoteSelected.Content    = Content;
            NoteSelected.CreatedAt  = DateTime.Now;
            NoteSelected.iNoteType  = (int)SelectedNoteType;
            NoteSelected.Longitude  = location.Longitude;
            NoteSelected.Latitude   = location.Latitude;

            //_noteService.SaveNote( NoteSelected );

            MessagingCenter.Instance.Send( this, "upsert", NoteSelected );

            await _navigation.PopAsync();
        }