Bug 60779 - [iOS11] TabbedPage loses tab bar when navigating back from a content page that hides the nav bar.
Summary: [iOS11] TabbedPage loses tab bar when navigating back from a content page tha...
Status: CONFIRMED
Alias: None
Product: Forms
Classification: Xamarin
Component: iOS ()
Version: 2.5.0
Hardware: PC Windows
: --- normal
Target Milestone: ---
Assignee: Bugzilla
URL:
Depends on:
Blocks:
 
Reported: 2017-11-20 21:47 UTC by Jon Goldberger [MSFT]
Modified: 2017-11-20 21:48 UTC (History)
1 user (show)

Tags:
Is this bug a regression?: ---
Last known good build:


Attachments
test Project (1.57 MB, application/zip)
2017-11-20 21:47 UTC, Jon Goldberger [MSFT]
Details


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Related Links:
Status:
CONFIRMED

Description Jon Goldberger [MSFT] 2017-11-20 21:47:38 UTC
Created attachment 25769 [details]
test Project

## Description

With following page navigation hierarchy, the TabbedPage loses its tab bar (not resized properly) when navigating back from a content page that had the navigation bar hidden. E.g.:

MasterDetailPage
- Master Page
- Detail Page (ContentPage wrapped in NavigationPage)
-- TabbedPage
--- ContentPage that hides nav bar.

Button on Detail Page pushes a new TabbedPage. The first tabbed page has a button that pushes a new content page that hides the navigation bar and has a button to pop the content page in order to go back to the TabbedPage. Upon going back to the tabbed page on iOS, the tab bar is hidden... it seems the page is not resized properly so the tab bar is hidden below the screen bounds. This does not occur on UWP or Android but since I thought that may be because the tab bar is at the top, I made the button on the TabbedPage appear at the bottom of the page to see if the button disappeared on UWP or Android... it did not so this does only occur on iOS 11 (works as expected on iOS 10.3 simulator). 

The TabbedPage will resize correctly after rotating device, or going back to the Original DetailPage and pushing the TabbedPage again. 

As a workaround, it seems that setting the NavigationBar to NOT be hidden before popping the page that hides the nav bar works around this issue, i.e. call:
> NavigationPage.SetHasNavigationBar(this, true);
before calling:
> await Navigation.PopAsync();



## Steps to reproduce

1. Open the attached test project

2. Deploy to an iOS 11 device or simulator:

3. Tap the "Go to tabbedpage" button

4. Tap the "Show page with no nav bar" button

5. Tap the "Cancel" button

Expected result: TabbedPage will be displayed with its tab bar at the bottom

Actual result: TabbedPage shows without its tab bar at the bottom until device is rotated. 


## Regression Status

Not a Regression since 2.4.0.280 which also displayed this issue. 

## Environment

Xamarin.Forms 2.5.0.91635

Microsoft Visual Studio Enterprise 2017 
Version 15.4.4
VisualStudio.15.Release/15.4.4+27004.2009
Microsoft .NET Framework
Version 4.7.02046

Installed Version: Enterprise

Architecture Diagrams and Analysis Tools   00369-90253-02232-AA699
Microsoft Architecture Diagrams and Analysis Tools

Visual Basic 2017   00369-90253-02232-AA699
Microsoft Visual Basic 2017

Visual C# 2017   00369-90253-02232-AA699
Microsoft Visual C# 2017

Visual C++ 2017   00369-90253-02232-AA699
Microsoft Visual C++ 2017

Visual F# 4.1   00369-90253-02232-AA699
Microsoft Visual F# 4.1

Application Insights Tools for Visual Studio Package   8.9.00809.2
Application Insights Tools for Visual Studio

ASP.NET and Web Tools 2017   15.0.30925.0
ASP.NET and Web Tools 2017

ASP.NET Core Razor Language Services   1.0
Provides languages services for ASP.NET Core Razor.

ASP.NET Web Frameworks and Tools 2012   4.0.20601.0
For additional information, visit https://www.asp.net/

ASP.NET Web Frameworks and Tools 2017   5.2.50921.0
For additional information, visit https://www.asp.net/

Azure App Service Tools v3.0.0   15.0.30915.0
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   2.3.0000.0
Microsoft Azure Data Lake Tools for Visual Studio

Azure Data Lake Tools for Visual Studio   2.3.0000.0
Microsoft Azure Data Lake Tools for Visual Studio

Common Azure Tools   1.10
Provides common services for use by Azure Mobile Services and Microsoft Azure Tools.

Fabric.DiagnosticEvents   1.0
Fabric Diagnostic Events

JavaScript Language Service   2.0
JavaScript Language Service

JavaScript Project System   2.0
JavaScript Project System

JavaScript UWP Project System   2.0
JavaScript UWP Project System

Merq   1.1.17-rc (cba4571)
Command Bus, Event Stream and Async Manager for Visual Studio extensions.

Microsoft Azure HDInsight Azure Node   2.2.8000.0
HDInsight Node under Azure Node

Microsoft Azure Hive Query Language Service   2.3.0000.0
Language service for Hive query

Microsoft Azure Service Fabric Tools for Visual Studio   1.8
Microsoft Azure Service Fabric Tools for Visual Studio

Microsoft Azure Stream Analytics Language Service   2.3.0000.0
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 2017 - v2.9.50719.1

Microsoft Continuous Delivery Tools for Visual Studio   0.3
Simplifying the configuration of continuous build integration and continuous build delivery 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 MI-Based Debugger   1.0
Provides support for connecting Visual Studio to MI compatible debuggers

Microsoft Visual C++ Wizards   1.0
Microsoft Visual C++ Wizards

Microsoft Visual Studio VC Package   1.0
Microsoft Visual Studio VC Package

Mono Debugging for Visual Studio   4.7.4-pre (c2d89eb)
Support for debugging Mono processes with Visual Studio.

NuGet Package Manager   4.4.0
NuGet Package Manager in Visual Studio. For more information about NuGet, visit http://docs.nuget.org/.

SQL Server Data Tools   15.1.61707.200
Microsoft SQL Server Data Tools

ToolWindowHostedEditor   1.0
Hosting json editor into a tool window

TypeScript   2.3.5.0
TypeScript tools for Visual Studio

Visual Studio Code Debug Adapter Host Package   1.0
Interop layer for hosting Visual Studio Code debug adapters in Visual Studio

Visual Studio Tools for Universal Windows Apps   15.0.27004.2008
The Visual Studio Tools for Universal Windows apps allow you to build a single universal app experience that can reach every device running Windows 10: phone, tablet, PC, and more. It includes the Microsoft Windows 10 Software Development Kit.

VisualStudio.IoT   1.0
Package with IoT components for Visual Studio

VisualStudio.Mac   1.0
Mac Extension for Visual Studio

WebJobs Tools v1.0.0   15.0.30923.0
WebJobs Tools v1.0.0

Xamarin   4.7.10.38 (34c1b6c)
Visual Studio extension to enable development for Xamarin.iOS and Xamarin.Android.

Xamarin.Android SDK   8.0.2.1 (HEAD/c2a33d8ea)
Xamarin.Android Reference Assemblies and MSBuild support.

Xamarin.iOS and Xamarin.Mac SDK   11.3.0.47 (51128b8)
Xamarin.iOS and Xamarin.Mac Reference Assemblies and MSBuild support.