Xamarin IOS SIGSEV崩溃DZNEmptyDataset

Question

在模拟器上运行时，我在Xamarin iOS项目上执行DZNEmptyDataset代码时遇到SIGSEV崩溃。我使用的是本机ios库DZNEmptyDataSet。

错误低于

   Thread 0 Crashed:: tid_403  Dispatch queue: com.apple.main-thread
     0   libsystem_kernel.dylib         0x0000000118a9cdd6 __pthread_kill + 10
     1   libsystem_pthread.dylib        0x0000000118ad4787 pthread_kill + 90
     2   libsystem_c.dylib              0x0000000118816fd7 abort + 129
     3   com.johnamcruz.Balln           0x000000010be4192e mono_handle_native_sigsegv + 574 (mini-exceptions.c:2420)
     4   com.johnamcruz.Balln           0x000000010bdbb24a mono_arch_handle_altstack_exception + 90 (exceptions-amd64.c:808)
     5   com.johnamcruz.Balln           0x000000010be4eade mono_sigsegv_signal_handler + 446 (mini-runtime.c:2883)
     6   libsystem_platform.dylib       0x0000000118abfbba _sigtramp + 26
     7   ???                            000000000000000000 0 + 0
     8   com.johnamcruz.Balln           0x000000010bd54c08 -[UIScrollView(DZNEmptyDataSet) dzn_reloadEmptyDataSet] + 33 (UIScrollView+EmptyDataSet.m:413)
     9   com.johnamcruz.Balln           0x000000010bd5562d dzn_original_implementation + 150 (UIScrollView+EmptyDataSet.m:577)
     10  com.apple.UIKit                0x0000000114cee302 -[UITableView layoutSubviews] + 34

我的代码如下。我在ViewDidAppear方法中刷新了tableview，并在ViewDidDisappear方法上将委托设置为null。

    public async override void ViewWillAppear(bool animated)
    {
        base.ViewWillAppear(animated);

        await RefreshGames();
        FacebookLogin();

        TableView.SetEmptyDataSetSource(new EmptyGameDataSource());
        TableView.TableFooterView = new UIView();
    }

    public override void ViewWillDisappear(bool animated)
    {
        TableView.SetEmptyDataSetSource(null);
        TableView.SetEmptyDataSetDelegate(null);
        TableView.Source = null;
        base.ViewWillDisappear(animated);
    }

    public async Task RefreshGames()
    {
        MTMBProgressHUD.ShowHUD(View, true);
        var datasource = new GameDataSource(await gameLogic.GetAllGamesAsync());
        datasource.RowDeleted += async (sender, e) => 
        {
            await gameLogic.DeleteGameAsync(e);
            await RefreshGames();
        };
        TableView.Source = datasource;
        MTMBProgressHUD.HideHUD(View, true);
    }