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Created attachment 9777 [details]
Discovered in Xamarin Forms 1.3.2, and 1.3.3, iOS and
reproduced it below.
If a TableView has a mixture of cells with different kinds of labels - meaning, some are just Label and others are a subclass of Label - then if any of those cells scroll off the page they may disappear.
If all of the cells use the subclass or they all use Label, then there is no issue. If the items do not scroll off the page, there is no issue.
There is no issue with Android.
Please see attached "App.cs" for a new Visual Studio Xamarin Forms solution
called BlankCell. You can interactively set the number of cells that use
regular or "custom" labels (it is an empty subclass). If either are
non-zero and the items scroll off the page, the bug is evident in iOS.
When reproducing, if using Visual Studio template, be sure to upgrade NuGet package to 220.127.116.1116 or above to see bug.
Couple more things (I'm the original author of the repo):
In the repo, the main page labels are backwards ( i.e. "Labels" actually is number of custom labels and vice versa). Sorry about confusion.
The issue is actually worse than than just mixing labels - it is mixing any kind of layout in a ViewCell. To reproduce, modify the repo so that both the Custom and Regular cell factory methods use Label (the text can be different). Verify that no cells disappear when scrolling. Then, remove the Entry element from the Custom method - or add another element. You should see that the same bug is evident.
I have checked this issue with xamarin.forms stable build 18.104.22.16823. Here, I am able to reproduce this issue. Here is the screencast regarding same :
I also observed that this issue is no more exist with latest xamarin.forms build "22.214.171.12429-pre3". Here is the screencast regarding same:
Can you please confirm us that this is working fine at your end also.
Microsoft Visual Studio Professional 2013
Version 12.0.31101.00 Update 4
Microsoft .NET Framework
Installed Version: Professional
LightSwitch for Visual Studio 2013 06177-004-0446016-02758
Microsoft LightSwitch for Visual Studio 2013
Team Explorer for Visual Studio 2013 06177-004-0446016-02758
Microsoft Team Explorer for Visual Studio 2013
Visual Basic 2013 06177-004-0446016-02758
Microsoft Visual Basic 2013
Visual C# 2013 06177-004-0446016-02758
Microsoft Visual C# 2013
Visual C++ 2013 06177-004-0446016-02758
Microsoft Visual C++ 2013
Visual F# 2013 06177-004-0446016-02758
Microsoft Visual F# 2013
Visual Studio 2013 Code Analysis Spell Checker 06177-004-0446016-02758
Microsoft® Visual Studio® 2013 Code Analysis Spell Checker
Portions of International CorrectSpell™ spelling correction system © 1993 by Lernout & Hauspie Speech Products N.V. All rights reserved.
The American Heritage® Dictionary of the English Language, Third Edition Copyright © 1992 Houghton Mifflin Company. Electronic version licensed from Lernout & Hauspie Speech Products N.V. All rights reserved.
Windows Phone SDK 8.0 - ENU 06177-004-0446016-02758
Windows Phone SDK 8.0 - ENU
Application Insights Tools for Visual Studio Package 1.0
Application Insights Tools for Visual Studio
ASP.NET Web Frameworks and Tools 2013 5.2.21010.0
For additional information, visit http://www.asp.net/
Common Azure Tools 1.3
Provides common services for use by Azure Mobile Services and Microsoft Azure Tools.
Microsoft Azure HDInsight HQL Service 1.0.0000.0
Language service for Hive query
Microsoft Azure HDInsight Tools for Visual Studio 1.0.0000.0
An integrated development environment for HDInsight application development.
Microsoft Azure Mobile Services Tools 1.3
Microsoft Azure Mobile Services Tools
Microsoft Azure Tools 2.5
Microsoft Azure Tools for Microsoft Visual Studio 2013 - v2.5.21104.1601
NuGet Package Manager 2.8.50926.663
NuGet Package Manager in Visual Studio. For more information about NuGet, visit http://docs.nuget.org/.
Office Developer Tools for Visual Studio 2013 ENU 12.0.30626
Microsoft Office Developer Tools for Visual Studio 2013 ENU
PowerShell Tools 1.3
Provides file classification services using PowerShell
PreEmptive Analytics Visualizer 1.2
Microsoft Visual Studio extension to visualize aggregated summaries from the PreEmptive Analytics product.
SQL Server Data Tools 12.0.41012.0
Microsoft SQL Server Data Tools
Windows Phone 8.1 SDK Integration 1.0
This package integrates the tools for the Windows Phone 8.1 SDK into the menus and controls of Visual Studio.
Workflow Manager Tools 1.0 1.0
This package contains the necessary Visual Studio integration components for Workflow Manager.
Xamarin 3.9.302.0 (80f4e84)
Visual Studio extension to enable development for Xamarin.iOS and Xamarin.Android.
Xamarin.Android 126.96.36.199 (49a04b966feb40dfdba49d57ba16249b66d606a6)
Visual Studio plugin to enable development for Xamarin.Android.
Xamarin.iOS 188.8.131.52 (3b3ef438017c7ecf486defa9e01567a5f2b3cb2a)
Visual Studio extension to enable development for Xamarin.iOS.
Xamarin.iOS Unified Migration 1.0
Automated migration for Xamarin iOS Classic projects to Unified
I can confirm that this is resolved when using Xamarin Forms 184.108.40.20629-pre3. Thanks.
Thanks for the confirmation Greg!
As per comment #3
>I also observed that this issue is no more exist with latest xamarin.forms build "220.127.116.1129-pre3". Here is
>the screencast regarding same: http://www.screencast.com/t/L07UVJ0FyEe5
I am closing this issue.