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Created attachment 11437 [details]
Our customer is facing an issue with GroupedHeader in ListView when using Xamarin.Forms
We are experiencing an issue with the Xamarin.Form listview control that seems to occur when we use Grouping Header. Specifically, when the header row is the very last row that is visible on the screen, the following exception is thrown:
Xamarin.Forms.Platform.iOS.ListViewRenderer+ListViewDataSource.SetCellBackgroundColor(UIKit.UITableViewCell cell, UIKit.UIColor color)
Xamarin.Forms.Platform.iOS.ListViewRenderer+ListViewDataSource.RowSelected(UIKit.UITableView tableView, Foundation.NSIndexPath indexPath)
UIKit.UIApplication.Main(System.String args, IntPtr principal, IntPtr delegate)UIApplication.cs:62
UIKit.UIApplication.Main(System.String args, System.String principalClassName, System.String delegateClassName)UIApplication.cs:45
For example, if you click on the row header "Starting at 1:30 PM", the exception is thrown
Once you scroll the data up so that there is at least one row under the header visible on the screen and click on the exact same header row, the exception no longer occurs.
I'm assuming it is trying to set the selected color for the first row under the group but is unable to when it is not visible on the screen.
Please advise as to if there is a workaround to this issue and/or when you expect this issue to be resolved as soon as possible. We have an upcoming release in the next couple days, and as of now, the application simply crashes with no indication to the user as to what happened.
Microsoft Visual Studio Premium 2013
Version 12.0.30723.00 Update 3
Microsoft .NET Framework
Installed Version: Premium
LightSwitch for Visual Studio 2013 06191-004-0454001-02022
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Microsoft Visual F# 2013
Visual Studio 2013 Code Analysis Spell Checker 06191-004-0454001-02022
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Windows Phone SDK 8.0 - ENU 06191-004-0454001-02022
Windows Phone SDK 8.0 - ENU
Application Insights Tools for Visual Studio Package 1.0
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ASP.NET and Web Tools 12.3.50717.0
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Xamarin 3.11.458.0 (7acdedd)
Visual Studio extension to enable development for Xamarin.iOS and Xamarin.Android.
Xamarin.Android 18.104.22.168 (3518c4ceb984ffea1f5d972ea9c09eb27738d565)
Visual Studio plugin to enable development for Xamarin.Android.
Xamarin.Forms Intellisense 1.0
Provides intellisense for Xamarin.Forms in the XML editor.
Xamarin.iOS 22.214.171.124 (7741cc495ab0baf04ff0405d0604bc27f0ecae2e)
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Xamarin.iOS Unified Migration 1.0
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Thanks for the report, bug is pretty obvious to see. UITableView.CellAt can return null and this case is improperly handled.
Should be fixed in 1.4.5-pre1
I have checked this issue with the help of sample project attached in bug description with Xamarin.Forms.126.96.36.19996-pre1 and observed that this issue has been fixed with Xamarin.Forms.188.8.131.5296-pre1.
Hence I am closing this issue.
Environment Info :
Microsoft Visual Studio Professional 2013
Version 12.0.31101.00 Update 4
Microsoft .NET Framework
Xamarin 3.11.850.0 (5c48f6b)
Xamarin.Android 184.108.40.206 (f98871a95a479f6d71b3067b7e5834d41fcb2118)
Xamarin.iOS 220.127.116.11 (a888f9e906e136062b2de4a6b738787daae4e824)
Xamarin.iOS Build Host : 18.104.22.168