Question

我不是在寻找解决方案，因为我相信在我的具体情况下，你们没有什么可以收集到导致这种情况的原因。但我想知道是否有人对这可能发生的事情有任何见解。我们每天有8K +用户。这个问题似乎只影响了我们用户的一小部分，而且似乎只发生在wifi上。但基本上，这就是他们所看到的：

所以它显示了列表视图的项目源的路径。而不是它应该显示的布局。布局非常复杂，所以我最初不会发布它，但如果有人想看到它，那么我肯定会在这里发布它。只是真的在这里寻找见解。它似乎只发生在我们显示图像时（我们为不想看图像的用户提供了另一个列表视图）。

更新（CustomGridCell）

这是我的布局：

            ImageFrame = new XamarinMobile.CustomRenderers.ExtendedFrame();
        FrameContainer = new Xamarin.Forms.AbsoluteLayout();
        ImageAndOverlayContainer = new Xamarin.Forms.AbsoluteLayout();
        ShowReadOverlay = new Xamarin.Forms.BoxView();

        headline = new Xamarin.Forms.Label();
        headline.VerticalOptions = Xamarin.Forms.LayoutOptions.Center;
        headline.HorizontalOptions = Xamarin.Forms.LayoutOptions.StartAndExpand;
        headline.TranslationX = 0;
        headline.TextColor = App.IsDarkThemeEnabled() ? Xamarin.Forms.Color.White : Xamarin.Forms.Color.Black;
        headline.FontSize = App.IsLargeTextEnabled() ? App.NormalizeFontSize(20) : App.NormalizeFontSize(16);

        loadingMoreStories = new Xamarin.Forms.Label();
        loadingMoreStories.VerticalOptions = Xamarin.Forms.LayoutOptions.Center;
        loadingMoreStories.HorizontalOptions = Xamarin.Forms.LayoutOptions.StartAndExpand;
        loadingMoreStories.TranslationX = 0;
        loadingMoreStories.TextColor = App.IsDarkThemeEnabled() ? Xamarin.Forms.Color.White : Xamarin.Forms.Color.Black;
        loadingMoreStories.FontSize = App.IsLargeTextEnabled() ? App.NormalizeFontSize(20) : App.NormalizeFontSize(16);

        publishDate = new Xamarin.Forms.Label();
        publishDate.VerticalOptions = Xamarin.Forms.LayoutOptions.Center;
        publishDate.HorizontalOptions = Xamarin.Forms.LayoutOptions.StartAndExpand;
        publishDate.TranslationX = 0;
        publishDate.TextColor = App.IsDarkThemeEnabled() ? Xamarin.Forms.Color.White : Xamarin.Forms.Color.Gray;
        publishDate.FontSize = App.IsLargeTextEnabled() ? App.NormalizeFontSize(16) : App.NormalizeFontSize(12);

        cellImage = new Xamarin.Forms.Image();
        loadingText = new Xamarin.Forms.Label();
        loadingText.Text = "Loading...";
        loadingText.TextColor = App.IsDarkThemeEnabled() ? Xamarin.Forms.Color.White : Xamarin.Forms.Color.Gray;
        GoogleAdView = new Xamarin.Forms.ContentView();
        activityIndicator = new Xamarin.Forms.ActivityIndicator()
        {
            IsEnabled = false,
            IsRunning = false,
            Color = Xamarin.Forms.Color.Red
        };
        GoogleAd = new Controls.Ad();
        GoogleAdView.Content = GoogleAd;
        GoogleAd.AdFailed = (r) =>
        {

        };
        GoogleAd.AdReturned = (r) =>
        {

        };

        layout = new Xamarin.Forms.Grid();
        AdContainer = new Xamarin.Forms.Grid();
        LoadingLayout = new Xamarin.Forms.StackLayout()
        {
            VerticalOptions = Xamarin.Forms.LayoutOptions.Center,
            BackgroundColor = Xamarin.Forms.Color.Transparent,
            HorizontalOptions = App.Settings.SettingsValues.GridListView ? Xamarin.Forms.LayoutOptions.Start : Xamarin.Forms.LayoutOptions.Center,
            Orientation = Xamarin.Forms.StackOrientation.Vertical,
            Children =
            {
                headline,
                publishDate,
                loadingMoreStories
            }
        };
        layout.RowDefinitions.Add(new Xamarin.Forms.RowDefinition { Height = new Xamarin.Forms.GridLength(1, Xamarin.Forms.GridUnitType.Star) });
        layout.ColumnDefinitions.Add(new Xamarin.Forms.ColumnDefinition { Width = new Xamarin.Forms.GridLength(1, Xamarin.Forms.GridUnitType.Star) });
        layout.Children.Add(loadingText, 0, 0);

        //Facebook Ads
        FacebookAdContainer = new Xamarin.Forms.StackLayout();
        FacebookAd = new Controls.FacebookAd();
        FacebookAd.PlacementId = $"{App.FacebookPlacementId}";
        FacebookAd.VerticalOptions = Xamarin.Forms.LayoutOptions.CenterAndExpand;
        FacebookAd.Page = MobileObjects.Enums.PageType.Grid;
        FacebookAdContainer.Children.Add(FacebookAd);

        AdContainer.Children.Add(GoogleAdView, 0, 0);
        AdContainer.Children.Add(FacebookAdContainer, 0, 0);

        layout.Children.Add(AdContainer, 0, 0);
        //ugh, we need to do an image frame because thats the only way (that I know of) to add a border on an image. We need this if the image is older than x, because they no longer have borders.
        ImageFrame.Padding = new Xamarin.Forms.Thickness(0);
        ShowReadOverlay.HeightRequest = 0;
        ImageAndOverlayContainer.Children.Add(cellImage);
        ImageAndOverlayContainer.Children.Add(ShowReadOverlay);

        ImageFrame.Content = ImageAndOverlayContainer;
        ImageFrame.HasShadow = false;

        FrameContainer.HorizontalOptions = Xamarin.Forms.LayoutOptions.CenterAndExpand;
        FrameContainer.Children.Add(ImageFrame);
        layout.Children.Add(FrameContainer, 0, 0);

        layout.Children.Add(ShowReadOverlay, 0, 0);
        layout.Children.Add(LoadingLayout, 0, 0);

        loadingText.HorizontalOptions = Xamarin.Forms.LayoutOptions.CenterAndExpand;
        loadingText.VerticalOptions = Xamarin.Forms.LayoutOptions.CenterAndExpand;
        cellImage.HorizontalOptions = Xamarin.Forms.LayoutOptions.CenterAndExpand;
        cellImage.VerticalOptions = Xamarin.Forms.LayoutOptions.CenterAndExpand;

        if (!hasLoadedAdAtLeastOnce)
        {
            hasLoadedAdAtLeastOnce = true;
        }

        layout.Padding = new Xamarin.Forms.Thickness(App.HorizontalGridPadding);
        LoadingLayout.WidthRequest = 280;
        GoogleAdView.Content.HorizontalOptions = Xamarin.Forms.LayoutOptions.Center;

        View = layout;

更新2（如何连线）

foreach (MobileObjects.GridListStory story in stories.StoryList)
            {
                index++;

                //if (index % (adLocation + 1) == 0 && index != stories.StoryList.Count)
                if (index == _firstadlocation + 1)
                {
                    PhoneCells.Add(new ViewModels.GridCellViewModel { Image = string.Empty, HasRead = false, Headline = "Loading Ad...", PublishDate = string.Empty, ActivityIndicator = new Xamarin.Forms.ActivityIndicator(), IsAd = true, ShowFacebookAd = App.Settings.SettingsValues.AdNetwork == MobileObjects.Enums.AdNetwork.facebook, rawCellIndex = index, collectionIndex = 0, numberOfStories = stories.StoryList.Count, LoadPageDate = LoadPageDate, StoryId = 0, IsEndOfGrid = IsEndOfGrid });
                    _numberOfAds++;
                }
                else
                {
                    if (_subsequentadlocation != 0 && index != _subsequentadlocation && index != _firstadlocation && ((index - (_firstadlocation)) % _subsequentadlocation == 0) && (index != stories.StoryList.Count || index != stories.StoryList.Count - 1))
                    {
                        PhoneCells.Add(new ViewModels.GridCellViewModel { Image = string.Empty, HasRead = false, Headline = "Loading Ad...", PublishDate = string.Empty, ActivityIndicator = new Xamarin.Forms.ActivityIndicator(), IsAd = true, ShowFacebookAd = App.Settings.SettingsValues.AdNetwork == MobileObjects.Enums.AdNetwork.facebook, rawCellIndex = index, collectionIndex = 0, numberOfStories = stories.StoryList.Count, LoadPageDate = LoadPageDate, StoryId = 0, IsEndOfGrid = IsEndOfGrid });
                        _numberOfAds++;
                    }
                }

                try
                {
                    ViewModels.GridCellViewModel newCell = new ViewModels.GridCellViewModel { Image = story.SquareImageURL, ImageWidth = story.SquareWidth, HasRead = story.ReadStory, Headline = story.Headline, PublishDate = story.AddedDateString, ActivityIndicator = new Xamarin.Forms.ActivityIndicator(), IsAd = false, rawCellIndex = index, collectionIndex = _index, numberOfStories = stories.StoryList.Count, LoadPageDate = LoadPageDate, StoryId = story.StoryId, IsEndOfGrid = IsEndOfGrid };

                    PhoneCells.Add(newCell);

                    //we could set these properties in the view model object above, but to make it easier to maintain, we're using a controller which will be the endpoint for any time we want to mark a story as read.
                    XamarinMobile.Controllers.SIRController.ChangeBGColor(story.ReadStory, PhoneCells[PhoneCells.Count - 1]);
                    XamarinMobile.Controllers.SIRController.ChangeTextColor(story.ReadStory, PhoneCells[PhoneCells.Count - 1]);
                }
                catch (System.Exception ex)
                {
                    var j = ex;
                }
                _index++;

                if (index == stories.StoryList.Count)
                {
                    _lastStoryIdOfGrid = story.StoryId;
                }
            }
            PhoneCells.Add(new ViewModels.GridCellViewModel { Image = string.Empty, HasRead = false, Headline = string.Empty, PublishDate = string.Empty, ActivityIndicator = new Xamarin.Forms.ActivityIndicator(), IsAd = false, collectionIndex = 0, rawCellIndex = stories.StoryList.Count + 1, numberOfStories = stories.StoryList.Count, LoadPageDate = LoadPageDate, StoryId = 0, IsEndOfGrid = IsEndOfGrid });
            SetUpGridNumberAndName();
            _navigatingToPage = false;
            Xamarin.Forms.Device.BeginInvokeOnMainThread(() =>
            {
                gridList.IsVisible = true;
                gridList.ItemTemplate = new DataTemplate(typeof(Classes.CustomGridCell));
                gridList.ItemsSource = PhoneCells;
                App.GridCells = PhoneCells;
                var adCells = PhoneCells.Where(x => x.IsAd);
                if (adCells != null)
                {
                    App.GridAdCells = new System.Collections.ObjectModel.ObservableCollection<ViewModels.GridCellViewModel>(adCells.ToList());
                }
            });

更新3（GridCellViewModel）

 public class GridCellViewModel : System.ComponentModel.INotifyPropertyChanged
{
    public event System.ComponentModel.PropertyChangedEventHandler PropertyChanged;

    private Xamarin.Forms.Color _backgroundColor;
    public Xamarin.Forms.Color BackgroundColor
    {
        get { return _backgroundColor; }
        set
        {
            if(HasRead)
            {
                _backgroundColor = value;
            } else
            {
                _backgroundColor = Xamarin.Forms.Color.Transparent;
            }

            PropertyChanged?.Invoke(this, new System.ComponentModel.PropertyChangedEventArgs("BackgroundColor"));
        }
    }

    private Xamarin.Forms.Color _textColor;
    public Xamarin.Forms.Color TextColor
    {
        get { return _textColor; }
        set
        {
            if (HasRead)
            {
                _textColor = value;
            }
            else
            {
                if(App.IsDarkThemeEnabled())
                {
                    _textColor = Xamarin.Forms.Color.White;
                } else
                {
                    _textColor = Xamarin.Forms.Color.Black;
                }
            }

            PropertyChanged?.Invoke(this, new System.ComponentModel.PropertyChangedEventArgs("TextColor"));
        }
    }
    public string Image { get; set; }
    public string Headline { get; set; }
    public string PublishDate { get; set; }
    public Xamarin.Forms.ActivityIndicator ActivityIndicator { get; set; }
    public bool IsAd { get; set; }

    public bool HasRead { get; set; }
    public bool AdHasLoaded { get; set; } = false;
    public int collectionIndex { get; set; }
    public int rawCellIndex { get; set; }
    public int numberOfStories { get; set; }
    public DateTime LoadPageDate { get; set; }
    public int StoryId { get; set; }
    public bool IsEndOfGrid { get; set; }
    //next 2 properties only used for tablets
    public int ImageWidth { get; set; }
    public int ImageHeight { get; set; }

    private Guid _adIdentification = Guid.NewGuid();
    public Guid AdIdentification
    {
        get
        {
            return _adIdentification;
        }
    }

    private MobileObjects.Enums.AdNetwork _adNetwork;

    public MobileObjects.Enums.AdNetwork AdNetwork
    {
        get
        {
            return App.Settings.SettingsValues.AdNetwork;
        }
    }

    private bool _showFacebookAd = true;
    public bool ShowFacebookAd
    {
        get { return _showFacebookAd; }
        set
        {
            _showFacebookAd = value;
            PropertyChanged?.Invoke(this, new System.ComponentModel.PropertyChangedEventArgs("ShowFacebookAd"));
        }
    }

    private bool _showGoogleAd = false;
    public bool ShowGoogleAd
    {
        get { return _showGoogleAd; }
        set
        {
            if (value == true)
            {
                //attempt to load ad???
            }

            _showGoogleAd = value;
            PropertyChanged?.Invoke(this, new System.ComponentModel.PropertyChangedEventArgs("ShowGoogleAd"));
        }
    }

为什么我的listview显示项目源数据类型？

0 个答案: