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Created attachment 10752 [details]
Test project to repro the bug
When having buttons (maybe other control too) in a syacklayout, and toggling IsVisible on the button, the layout fail : most of the time (but not always) when toggling IsVisible from false to true, the controls inside de stacklayout are not redrawn.
Partial Workaround is to play with opacity =0, but when setting opacity =0 the control is style there rooms it taks is not freed, which is annoying.
Fail on iOS, did not tryed on Android or Win8
Attached a test project :
Click on the Record :
Record button should deseppears
Stop and Pause button should appear
Click on stop :
Record button should appear
Stop and Pause button should deseppear
I see the same behavior. It is not allways. Sometimes works all perfect, but than I get it again. Would say 1 of 8 tries, perhaps more often.
And I don't see this on Android. It is a iOS only problem, but not tested on WinPhone.
Created attachment 10910 [details]
I have checked this issue and able to reproduce this. To reproduce this issue I have followed the steps and instruction provided in bug description.
Steps I followed:
1. Open attached test case in VS.
2. Build and deploy the application on iOS.
3. Click on the Record button.
4. Record button should disappears, Stop and Pause button will appear.
5. Click on stop button,
6. Record button should appear Stop and Pause button should disappears.
7. Repeat steps 3 - 6 more that 8 times.
8. Observed that Toggling IsVisible on controls in a stacklayout failed.
Additional Information: It is working fine with the android.
VS Trace Logs:
Microsoft Visual Studio Professional 2013
Version 12.0.31101.00 Update 4
Microsoft .NET Framework
Installed Version: Professional
LightSwitch for Visual Studio 2013 06177-004-0446016-02381
Microsoft LightSwitch for Visual Studio 2013
Team Explorer for Visual Studio 2013 06177-004-0446016-02381
Microsoft Team Explorer for Visual Studio 2013
Visual Basic 2013 06177-004-0446016-02381
Microsoft Visual Basic 2013
Visual C# 2013 06177-004-0446016-02381
Microsoft Visual C# 2013
Visual C++ 2013 06177-004-0446016-02381
Microsoft Visual C++ 2013
Visual F# 2013 06177-004-0446016-02381
Microsoft Visual F# 2013
Visual Studio 2013 Code Analysis Spell Checker 06177-004-0446016-02381
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 06177-004-0446016-02381
Windows Phone SDK 8.0 - ENU
Application Insights Tools for Visual Studio Package 1.0
Application Insights Tools for Visual Studio
ASP.NET and Web Tools 12.4.51016.0
Microsoft Web Developer Tools contains the following components:
Support for creating and opening ASP.NET web projects
Browser Link: A communication channel between Visual Studio and browsers
Page Inspector: Inspection tool for ASP.NET web projects
Scaffolding: A framework for building and running code generators
Server Explorer extensions for Microsoft Azure Websites
Web publishing: Extensions for publishing ASP.NET web projects to hosting providers, on-premises servers, or Microsoft Azure
ASP.NET Web Frameworks and Tools 2012.2 4.1.21001.0
For additional information, visit http://go.microsoft.com/fwlink/?LinkID=309563
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 Advertising SDK for Windows Phone
Microsoft Advertising SDK for Windows Phone
Microsoft Azure Mobile Services Tools 1.3
Microsoft Azure Mobile Services Tools
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 3.11.450.0 (44cf6bf)
Visual Studio extension to enable development for Xamarin.iOS and Xamarin.Android.
Xamarin.Android 126.96.36.199 (d23da369e436488f38c8ab8fe8a9ae7d9ea5256b)
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 188.8.131.52 (7741cc495ab0baf04ff0405d0604bc27f0ecae2e)
Visual Studio extension to enable development for Xamarin.iOS.
Xamarin.iOS Unified Migration 1.0
Automated migration for Xamarin iOS Classic projects to Unified
Early preview of Xamarin Test Cloud integration
An Update to this issue:
Xamarin.Forms: Version 184.108.40.20658-pre2
Found a workaround. For child controls of StackLayout, set HeightRequest = 0 instead of IsVisible = false, and HeightRequest = -1 instead of IsVisible = true. Tested with StackLayouts nested inside a top-level StackLayout.
I could reproduce it too. Changing the IsVisible property of the view is not always hiding/showing.
Happened when binding the IsVisible to a property and changing it on the view model (raising property changed).
I Forgot to add that happens with StackLayout and Entry too.
Same problem in IOS, not always happen but definitely happen in few times.
Android works fine.........
Seeing the same thing on iOS in a Grid Layout. I have two buttons with their IsVisible properties bound to a property set to 'false'. The first time the property goes to 'true', nothing happens. If the property is subsequently set back to 'false', then to 'true', the behavior is as expected and works as expected on that page afterward.
Manually setting the IsVisible property of the buttons in the code behind instead of using data binding will occasionally cause the buttons to flash into view before disappearing.
Looks like this bug is fixed with the last release Xamarin.Forms 1.4.3-pre3 Released should anybody can confirm ?
Resolved in Xamarin.Forms 1.4.3-pre3