Bug 23234 - [iOS] Calling PopToRootAsync throws the System.NullReferenceException
Summary: [iOS] Calling PopToRootAsync throws the System.NullReferenceException
Status: RESOLVED FIXED
Alias: None
Product: Forms
Classification: Xamarin
Component: Forms ()
Version: 1.2.3
Hardware: PC Mac OS
: Normal normal
Target Milestone: ---
Assignee: Bugzilla
URL:
Depends on:
Blocks:
 
Reported: 2014-09-22 06:31 UTC by Prashant Cholachagudda
Modified: 2014-09-23 00:13 UTC (History)
5 users (show)

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


Attachments
Testcase (2.99 MB, application/zip)
2014-09-22 06:31 UTC, Prashant Cholachagudda
Details


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Status:
RESOLVED FIXED

Description Prashant Cholachagudda 2014-09-22 06:31:55 UTC
Created attachment 8140 [details]
Testcase

Calling `PopToRootAsync` throws the System.NullReferenceException on iOS project on Xamarin.Forms v1.2.3.6255-pre3, 
but it seems to work on v1.2.3.6255-pre2 and v1.2.2.6243

Stack trace: 
System.NullReferenceException: Object reference not set to an instance of an object
  at Xamarin.Forms.Platform.iOS.NavigationRenderer+ParentingViewController.ViewDidLayoutSubviews () [0x00000] in <filename unknown>:0
  at at (wrapper managed-to-native) MonoTouch.UIKit.UIApplication:UIApplicationMain (int,string[],intptr,intptr)
  at MonoTouch.UIKit.UIApplication.Main (System.String[] args, IntPtr principal, IntPtr delegate) [0x00005] in /Developer/MonoTouch/Source/monotouch/src/UIKit/UIApplication.cs:62
  at MonoTouch.UIKit.UIApplication.Main (System.String[] args, System.String principalClassName, System.String delegateClassName) [0x00038] in /Developer/MonoTouch/Source/monotouch/src/UIKit/UIApplication.cs:46
  at PopTest.iOS.Application.Main (System.String[] args) [0x00008] in /Users/prashantvc/Desktop items/Xamarin/89728/PopTest/iOS/Main.cs:17
Comment 1 Parmendra Kumar 2014-09-22 07:44:36 UTC
I have checked this issue with given attached sample project in bug description.And I am getting the same behavior as define in bug description.
Calling `PopToRootAsync` throws Exception "System.NullReferenceException" on iOS project on Xamarin.Forms v1.2.3.6255-pre3, But it seems to work on v1.2.2.6243

Screencast: http://screencast.com/t/sWv6oWjd

Environment Info:
=== Xamarin Studio ===

Version 5.4 (build 240)
Installation UUID: 1a096c6f-0678-402e-89b2-a2c10f7e80e4
Runtime:
	Mono 3.8.0 ((no/45d0ba1)
	GTK+ 2.24.23 (Raleigh theme)

	Package version: 308000009

=== Xamarin.Android ===

Version: 4.16.0 (Business Edition)
Android SDK: /Users/360_macmini/Desktop/android-sdk-macosx
	Supported Android versions:
		2.1    (API level 7)
		2.2    (API level 8)
		2.3    (API level 10)
		3.1    (API level 12)
		3.2    (API level 13)
		4.0    (API level 14)
		4.0.3  (API level 15)
		4.1    (API level 16)
		4.2    (API level 17)
		4.3    (API level 18)
		4.4    (API level 19)
		4.4.87 (API level 20)
Java SDK: /usr
java version "1.6.0_65"
Java(TM) SE Runtime Environment (build 1.6.0_65-b14-462-11M4609)
Java HotSpot(TM) 64-Bit Server VM (build 20.65-b04-462, mixed mode)

=== Apple Developer Tools ===

Xcode 6.0.1 (6528)
Build 6A317

=== Xamarin.iOS ===

Version: 8.0.0.62 (Business Edition)
Hash: 8bd8158
Branch: 
Build date: 2014-09-18 09:12:55-0400

=== Xamarin.Mac ===

Version: 1.10.0.13 (Business Edition)

=== Build Information ===

Release ID: 504000240
Git revision: 01786bc67c7024ec33d327ed27e4416d7a846f4e
Build date: 2014-09-17 10:58:48-04
Xamarin addins: 7cd7dfcd6b7b7b53281508954ec080f1cd153ad3

=== Operating System ===

Mac OS X 10.9.4
Darwin ShrutiMac.local 13.3.0 Darwin Kernel Version 13.3.0
    Tue Jun  3 21:27:35 PDT 2014
    root:xnu-2422.110.17~1/RELEASE_X86_64 x86_64
Comment 2 Jason Smith [MSFT] 2014-09-23 00:13:59 UTC
Fixed, thanks