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[Bug] [iOS] CarouselView position is not changed if Page with CarouselView isn't shown. #14660

Open Kalyxt opened 2 years ago

Kalyxt commented 2 years ago

Description

There is a bug in CarouselView where position of the CarouselView isn't changed if I change him from another Page (Before the page with CarouselView is shown).

Steps to Reproduce

I've created simple application to simulate the exact problem. There are TabbedPage with two ContentPages. One page contains ListView of categories and second page contains CarouselView with ItemSource as categories and ListView with category items.

  1. Somehow it works when you pick first Item in CarouselView (pick something else than first category in list (Cars in this case)).
  2. Go back to Categories, which is first page and select any other category again.
  3. CarouselView is showing Items that you picked in first step.

Issue is only on iOS devices, android devices are not affected by this.

Expected Behavior

Actual Behavior

Basic Information

Environment

Show/Hide Visual Studio info ``` Microsoft Visual Studio Community 2019 Version 16.10.2 VisualStudio.16.Release/16.10.2+31410.357 Microsoft .NET Framework Version 4.8.04084 Installed Version: Community .NET Core Debugging with WSL 2 1.0 .NET Core Debugging with WSL 2 ADL Tools Service Provider 1.0 This package contains services used by Data Lake tools ASA Service Provider 1.0 ASP.NET and Web Tools 2019 16.10.526.50910 ASP.NET and Web Tools 2019 ASP.NET Web Frameworks and Tools 2019 16.10.526.50910 For additional information, visit https://www.asp.net/ Azure App Service Tools v3.0.0 16.10.526.50910 Azure App Service Tools v3.0.0 Azure Data Lake Node 1.0 This package contains the Data Lake integration nodes for Server Explorer. Azure Data Lake Tools for Visual Studio 2.6.1000.0 Microsoft Azure Data Lake Tools for Visual Studio Azure Functions and Web Jobs Tools 16.10.526.50910 Azure Functions and Web Jobs Tools Azure Stream Analytics Tools for Visual Studio 2.6.1000.0 Microsoft Azure Stream Analytics Tools for Visual Studio C# Tools 3.10.0-4.21269.26+029847714208ebe49668667c60ea5b0a294e0fcb C# components used in the IDE. Depending on your project type and settings, a different version of the compiler may be used. Common Azure Tools 1.10 Provides common services for use by Azure Mobile Services and Microsoft Azure Tools. Extensibility Message Bus 1.2.6 (master@34d6af2) Provides common messaging-based MEF services for loosely coupled Visual Studio extension components communication and integration. IntelliCode Extension 1.0 IntelliCode Visual Studio Extension Detailed Info Microsoft Azure HDInsight Azure Node 2.6.1000.0 HDInsight Node under Azure Node Microsoft Azure Hive Query Language Service 2.6.1000.0 Language service for Hive query Microsoft Azure Stream Analytics Language Service 2.6.1000.0 Language service for Azure Stream Analytics Microsoft Azure Stream Analytics Node 1.0 Azure Stream Analytics Node under Azure Node Microsoft Azure Tools 2.9 Microsoft Azure Tools for Microsoft Visual Studio 2019 - v2.9.40423.1 Microsoft Continuous Delivery Tools for Visual Studio 0.4 Simplifying the configuration of Azure DevOps pipelines from within the Visual Studio IDE. Microsoft JVM Debugger 1.0 Provides support for connecting the Visual Studio debugger to JDWP compatible Java Virtual Machines Microsoft Library Manager 2.1.113+g422d40002e.RR Install client-side libraries easily to any web project Microsoft MI-Based Debugger 1.0 Provides support for connecting Visual Studio to MI compatible debuggers Microsoft Visual Studio Tools for Containers 1.2 Develop, run, validate your ASP.NET Core applications in the target environment. F5 your application directly into a container with debugging, or CTRL + F5 to edit & refresh your app without having to rebuild the container. Mono Debugging for Visual Studio 16.10.15 (552afdf) Support for debugging Mono processes with Visual Studio. NuGet Package Manager 5.10.0 NuGet Package Manager in Visual Studio. For more information about NuGet, visit https://docs.nuget.org/ ProjectServicesPackage Extension 1.0 ProjectServicesPackage Visual Studio Extension Detailed Info Razor (ASP.NET Core) 16.1.0.2122504+13c05c96ea6bdbe550bd88b0bf6cdddf8cde1725 Provides languages services for ASP.NET Core Razor. SQL Server Data Tools 16.0.62105.04180 Microsoft SQL Server Data Tools ToolWindowHostedEditor 1.0 Hosting json editor into a tool window TypeScript Tools 16.0.30429.2002 TypeScript Tools for Microsoft Visual Studio Visual Basic Tools 3.10.0-4.21269.26+029847714208ebe49668667c60ea5b0a294e0fcb Visual Basic components used in the IDE. Depending on your project type and settings, a different version of the compiler may be used. Visual F# Tools 16.10.0-beta.21262.7+1b23bbeda88ea3cb9be9af777f4c99fa8663df81 Microsoft Visual F# Tools Visual Studio Code Debug Adapter Host Package 1.0 Interop layer for hosting Visual Studio Code debug adapters in Visual Studio Visual Studio Container Tools Extensions 1.0 View, manage, and diagnose containers within Visual Studio. Visual Studio Tools for Containers 1.0 Visual Studio Tools for Containers VisualStudio.DeviceLog 1.0 Information about my package VisualStudio.Foo 1.0 Information about my package VisualStudio.Mac 1.0 Mac Extension for Visual Studio Xamarin 16.10.000.231 (d16-10@8111164) Visual Studio extension to enable development for Xamarin.iOS and Xamarin.Android. Xamarin Designer 16.10.0.115 (remotes/origin/c750fbf1bde3c720d077f51640fe197c6dac7cbe@c750fbf1b) Visual Studio extension to enable Xamarin Designer tools in Visual Studio. Xamarin Templates 16.10.5 (355b57a) Templates for building iOS, Android, and Windows apps with Xamarin and Xamarin.Forms. Xamarin.Android SDK 11.3.0.4 (d16-10/ae14caf) Xamarin.Android Reference Assemblies and MSBuild support. Mono: b4a3858 Java.Interop: xamarin/java.interop/d16-10@f39db25 ProGuard: Guardsquare/proguard/v7.0.1@912d149 SQLite: xamarin/sqlite/3.35.4@85460d3 Xamarin.Android Tools: xamarin/xamarin-android-tools/d16-10@c5732a0 Xamarin.iOS and Xamarin.Mac SDK 14.20.0.10 (0e35b2e0b) Xamarin.iOS and Xamarin.Mac Reference Assemblies and MSBuild support. ```

Reproduction Link

https://github.com/Kalyxt/Tester_CarouselView.git

I used various topics as list of categories (Cars, Boats, Bikes, etc) and StockCards as one item in Categories (Skoda, Yamato, Shimano, etc) so Category Cars will contain these Stockcards - Skoda, Tesla, WW, etc.

Workaround

I found few workarounds but non of the is ideal.

  1. Before you start to change selected items in CarouselView, show page with CarouselView and go back to item selection.
  2. Move your Current Item change logic of CarouselView to OnAppearing, but that way you will first see old group of items and then fast switch to new item of the CarouselView.
Kalyxt commented 2 years ago

@jsuarezruiz Please change labels, it should be CarouselView, title was wrong but sample is using CarouselView.

Kalyxt commented 2 years ago

https://user-images.githubusercontent.com/26333327/136789770-c2d734b6-48ef-4e59-8a4a-71547e6be5f7.mp4

Here is video with the issue. I selected Rockets as first category, then returned to list of categories and select another and another category which as you can see wasn't loaded properly. There was items from Rockets category regardless of what I picked. Later on I manually switch category and picking started to work as expected.