Xamarin.forms: [Bug] CollectionView crashes on adding item
Description
Xamarin Forms CollectionView crashes in the newest Xamarin.Forms-nightly versions when adding items with exception:
System.ObjectDisposedException: 'Cannot access a disposed object.
Object name: 'Xamarin.Forms.Platform.Android.GroupableItemsViewAdapter`2[[Xamarin.Forms.GroupableItemsView, Xamarin.Forms.Core, Version=2.0.0.0, Culture=neutral, PublicKeyToken=null],[Xamarin.Forms.Platform.Android.IGroupableItemsViewSource, Xamarin.Forms.Platform.Android, Version=2.0.0.0, Culture=neutral, PublicKeyToken=null]]'.'
However when i change my code to ListView it works again as usual.
Steps to Reproduce
- Create a CollectionView
- Add items to it
Basic Information
- Version with issue: 4.4.0.1142-nightly
- Last known good version: unknown
- IDE:
- Platform Target Frameworks:
- Android: 9.0
Codelisk
All 46 comments
@hudaIT Can you please attach a small project that demonstrates this issue? Thanks!
samhouts
on 13 Sep 2019
@hudaIT Can you please attach a small project that demonstrates this issue? Thanks!
I tried to reproduce my issue in a blank project, however i couldn't do it. I think this issue can be closed because i do not know what the excatly the issue is, i only know that it works with ListView while it does not with CollectionView.
Codelisk
on 14 Sep 2019
I have the same problem.
Here is the exception that I get when I add items to my ObservableCollection
Foundation.MonoTouchException: 'Objective-C exception thrown. Name: NSInternalInconsistencyException Reason: Invalid update: invalid number of items in section 0. The number of items contained in an existing section after the update (1) must be equal to the number of items contained in that section before the update (1), plus or minus the number of items inserted or deleted from that section (1 inserted, 0 deleted) and plus or minus the number of items moved into or out of that section (0 moved in, 0 moved out).
Native stack trace:
0 CoreFoundation 0x000000011aa078db __exceptionPreprocess + 331
1 libobjc.A.dylib 0x000000011b913ac5 objc_exception_throw + 48
2 CoreFoundation 0x000000011aa07662 +[NSException raise:format:arguments:] + 98
3 Foundation 0x0000000116d0676b -[NSAssertionHandler handleFailureInMethod:object:file:lineNumber:description:] + 194
4 UIKitCore 0x000000012440c7f1 -[UICollectionView _endItemAnimationsWithInvalidationContext:tentativelyForReordering:animator:] + 16127
5 UIKitCore 0x00000001244085b1 -[UICollectionView _updateRowsAtIndexPaths:updateAction:updates:] + 519
6 UIKitCore 0x000000012440863c -[UICollectionView insertItemsAtIndexPaths:] + 64
7 Farouq.Xamarin.iOS 0x000000010d8534c9 xamarin_dyn_objc_msgSend + 217
8 ??? 0x00000001406875b8 0x0 + 5375555000
'
Elashi
on 16 Sep 2019
I found the solution for this particular problem. The problem has actually started when I cleared the data. But it only showed up during Add.
Replacing Items.Clear(); with the following block of code, fixed the problem.
int itemsCount = Items.Count;
for (int i = 0; i < itemsCount; i++)
Items.RemoveAt(0);
I found the solution here.
But I think it still needs to be fixed in the library and I think this link is a good hint to how to solve it.
Elashi
on 16 Sep 2019
I found the solution for this particular problem.
Unfortunately it worked only in one place (one page view) but it did not work in the others. I am still crashing right at the line that adds items to the ObservableCollection
Elashi
on 16 Sep 2019
@Elashi Can you please attach a small project that demonstrates this issue? Thanks!
samhouts
on 16 Sep 2019
@hudaIT Can you please attach a small project that demonstrates this issue? Thanks!
@samhouts is it possible to provide you a project directly without attaching it in publicity? I have a project where i face this issue in 3 different collectionviews. If it is useful for you i could send you the project directly.
Codelisk
on 18 Sep 2019
Yes, you can send me a link via email. sahou at microsoft. A zip attachment may get blocked. Thanks!
samhouts
on 18 Sep 2019
Here is a small project.
All I did is I created a new Shell project and changed the ListView into CollectionView
Make sure you run it on iOS .
The application will swallow the exception nothing will happen and no items will be displayed.
If you run on Android Emulator , it will run perfectly showing all items.
CollViewCrash.zip
Elashi
on 18 Sep 2019
Here is another one , a little bit more complicated but it will show you the exception when you press the Add button.
If it did not show you the exception the first time, try it again. Because it does not show the exception persistently.
RtlCollectionView2.zip
Elashi
on 18 Sep 2019
Hm okay i think we actually have 2 different issues here
Codelisk
on 18 Sep 2019
@Elashi I ran CollViewCrash.zip with 4.4.0.1174-nightly but was unable to reproduce your issue. I see the items. Can you check with that Nuget and see if you still see the issue?
adrianknight89
on 21 Sep 2019
The latest version I have on Nuget is 4.2 yet
Elashi
on 22 Sep 2019
The latest version I have on Nuget is 4.2 yet
@Elashi
https://github.com/xamarin/Xamarin.Forms/wiki/Nightly-Builds => for latest builds
Codelisk
on 23 Sep 2019
We experience the same crash. Tried using the nightly NuGet (4.4.0.1174-nightly) but still occurring: **System.ObjectDisposedException:** 'Cannot access a disposed object.
Object name: 'Xamarin.Forms.Platform.Android.GroupableItemsViewAdapter2[[Xamarin.Forms.GroupableItemsView, Xamarin.Forms.Core, Version=2.0.0.0, Culture=neutral, PublicKeyToken=null],[Xamarin.Forms.Platform.Android.IGroupableItemsViewSource, Xamarin.Forms.Platform.Android, Version=2.0.0.0, Culture=neutral, PublicKeyToken=null]]'.'
andyhoyle
on 23 Sep 2019
We experience the same crash. Tried using the nightly NuGet (4.4.0.1174-nightly) but still occurring:
**System.ObjectDisposedException:** 'Cannot access a disposed object. Object name: 'Xamarin.Forms.Platform.Android.GroupableItemsViewAdapter2[[Xamarin.Forms.GroupableItemsView, Xamarin.Forms.Core, Version=2.0.0.0, Culture=neutral, PublicKeyToken=null],[Xamarin.Forms.Platform.Android.IGroupableItemsViewSource, Xamarin.Forms.Platform.Android, Version=2.0.0.0, Culture=neutral, PublicKeyToken=null]]'.'
@andyhoyle Have you been able to observe what's the issue? Maby you are able to provide a sample project because i could not.
Codelisk
on 23 Sep 2019
I've created a new project to try and reproduce the crash but have not succeeded so far. I am going to go back to the original project and pull items out of the XAML one by one until I isolate it.
andyhoyle
on 23 Sep 2019
Replicated in the new project.
Bug7510.zip
andyhoyle
on 23 Sep 2019
I can't reproduce the problem. I have tried several versions (4.3 and 4.4) without success. Could you update (for example to the 4.3.0.819712-pre2 version) and verify it?.
jsuarezruiz
on 23 Sep 2019
Ooops, I just saw your new sample where I reproduce the error. I will check it!.
jsuarezruiz
on 23 Sep 2019
In the above zip Bug7510.zip the error occurs with version 4.3.0.819712-pre2. If I comment out the overridden OnAppearing then no crash occurs. Rolling back to 4.2.0.815419 crash does not occur.
andyhoyle
on 23 Sep 2019
On further investigation, it's caused by calling new ObservableCollection() more than once.
andyhoyle
on 23 Sep 2019
On further investigation, it's caused by calling
new ObservableCollection()more than once.
Ah thank you very much i think that's causing my crash too.
Codelisk
on 23 Sep 2019
The latest version I have on Nuget is 4.2 yet
@Elashi
https://github.com/xamarin/Xamarin.Forms/wiki/Nightly-Builds => for latest builds
Something went wrong on my machine. No iOS builds successfully now , even a freshly generated Xamarin project. I apologize , I won't be able to test 4.4 .
Elashi
on 23 Sep 2019
I had exactly the same issue on 4.3.0.908675 when adding items to ObservableCollection and as mentioned by @andyhoyle it was fixed by preventing calling of new ObservableCollection() more than once.
Exception:
System.ObjectDisposedException: Cannot access a disposed object. Object name: 'Xamarin.Forms.Platform.Android.GroupableItemsViewAdapter2[[Xamarin.Forms.GroupableItemsView, Xamarin.Forms.Core, Version=2.0.0.0, Culture=neutral, PublicKeyToken=null],[Xamarin.Forms.Platform.Android.IGroupableItemsViewSource, Xamarin.Forms.Platform.Android, Version=2.0.0.0, Culture=neutral, PublicKeyToken=null]]'. at Java.Interop.JniPeerMembers.AssertSelf (Java.Interop.IJavaPeerable self) [0x00029] in <42bcf67b56bc4c909c2a5edee682522b>:0 at Java.Interop.JniPeerMembers+JniInstanceMethods.InvokeNonvirtualVoidMethod (System.String encodedMember, Java.Interop.IJavaPeerable self, Java.Interop.JniArgumentValue* parameters) [0x00000] in <42bcf67b56bc4c909c2a5edee682522b>:0 at Android.Support.V7.Widget.RecyclerView+Adapter.NotifyItemInserted (System.Int32 position) [0x00022] in <844c913cb32f4510879031be59eb1dce>:0 at Xamarin.Forms.Platform.Android.AdapterNotifier.NotifyItemInserted (Xamarin.Forms.Platform.Android.IItemsViewSource source, System.Int32 startIndex) [0x00000] in D:\a\1\s\Xamarin.Forms.Platform.Android\CollectionView\AdapterNotifier.cs:27 at Xamarin.Forms.Platform.Android.ObservableItemsSource.Add (System.Collections.Specialized.NotifyCollectionChangedEventArgs args) [0x00041] in D:\a\1\s\Xamarin.Forms.Platform.Android\CollectionView\ObservableItemsSource.cs:131 at Xamarin.Forms.Platform.Android.ObservableItemsSource.CollectionChanged (System.Object sender, System.Collections.Specialized.NotifyCollectionChangedEventArgs args) [0x00023] in D:\a\1\s\Xamarin.Forms.Platform.Android\CollectionView\ObservableItemsSource.cs:88 at (wrapper delegate-invoke) <Module>.invoke_void_object_NotifyCollectionChangedEventArgs(object,System.Collections.Specialized.NotifyCollectionChangedEventArgs) at System.Collections.ObjectModel.ObservableCollection1[T].OnCollectionChanged (System.Collections.Specialized.NotifyCollectionChangedEventArgs e) [0x00018] in <9e820d206a8d4177b453df9c2fa8d1cc>:0 at System.Collections.ObjectModel.ObservableCollection1[T].OnCollectionChanged (System.Collections.Specialized.NotifyCollectionChangedAction action, System.Object item, System.Int32 index) [0x00009] in <9e820d206a8d4177b453df9c2fa8d1cc>:0 at System.Collections.ObjectModel.ObservableCollection1[T].InsertItem (System.Int32 index, T item) [0x0001a] in <9e820d206a8d4177b453df9c2fa8d1cc>:0 at System.Collections.ObjectModel.Collection`1[T].Add (T item) [0x00020]
anpin
on 26 Oct 2019
Is there any update on this item. I seem to be getting this Cannot access a disposed object.Object name: 'Xamarin.Forms.Platform.Android.GroupableItemsViewAdapter error when I update an item in an ObservableCollection that is bound to a CollectionView.
I've got Xamarin.Forms v4.3.0.947036 installed. Should I downgrade? if so what version?
FrazzApps
on 30 Oct 2019
@FrazzApps Downgrading to v4.2.0.910310 solved the issue for me.
rlubkowski
on 31 Oct 2019
@samhouts and @jsuarezruiz
I would like to work on this bug if it is not inprogress
Elashi
on 4 Nov 2019
@Elashi It looks like we do have a PR open for this already. https://github.com/xamarin/Xamarin.Forms/pull/7670. @jsuarezruiz can provide more info on the status. Thanks!!
samhouts
on 4 Nov 2019
Perfect. Then I will go check this PR.
Thanks.
Sent from my iPhone
On Nov 5, 2019, at 12:12 AM, Samantha Houts notifications@github.com wrote:
@Elashi It looks like we do have a PR open for this already. #7670. @jsuarezruiz can provide more info on the status. Thanks!!
—
You are receiving this because you were mentioned.
Reply to this email directly, view it on GitHub, or unsubscribe.
Elashi
on 5 Nov 2019
Any workaround without downgrade? I cannot switch to v4.2.0.910310 because I'm already using the RefreshView.
dm-CaT
on 14 Nov 2019
It is fixed but the PR is not merged yet :(
The problem happens if you modify the ObservableCollection by insertions and deletions.
However, you can avoid that by replacing the whole ObservableCollection by creating a clone of the original collection, modify the clone, and assign ItemsSource the new modified clone.
This should resolve the problem temporarily.
Elashi
on 14 Nov 2019
@Elashi thanks for the idea. I think in this case I can use regular List
UPDATE: I did a check and the only way the workaround works is to assign a collection copy to the property. I've used a List
dm-CaT
on 14 Nov 2019
@Elashi I'm using temporary solution which is to assign a collection copy ,it's work,but when i load more data,i think there is a little stuck because of reassignment.Can I do something to solve it?
StefanVam
on 25 Nov 2019
when will bug fix?
kenchan97
on 25 Nov 2019
@StefanVam What I really did to get over this problem is stick with 4.2
And to get over @dm-CaT 's problem , I used the plugin https://github.com/jamesmontemagno/Xamarin.Forms-PullToRefreshLayout
It is very similar to Xamarin's.
Here is an example:
Xamarin's Pull To Refresh in version 4.3 :
<RefreshView
Command="{Binding LoadReferencesCommand}"
IsRefreshing="{Binding IsBusy, Mode=OneWay}">
<CollectionView
ItemsSource="{Binding References}">
</CollectionView>
</RefreshView>
And this is @jamesmontemagno 's Pull To Refresh plugin :
<ptr:PullToRefreshLayout
IsPullToRefreshEnabled="True"
RefreshCommand="{Binding RefreshReferencesCommand}"
IsRefreshing="{Binding IsBusy, Mode=OneWay}">
<CollectionView
ItemsSource="{Binding References}">
</CollectionView>
</ptr:PullToRefreshLayout>
@Elashi Thanks for your reply .I'm using XF version 4.3 now,i think i'll rollback to 4.2 if this bug doesn't fixed in the near future.
StefanVam
on 26 Nov 2019
I have bad solution, but temporary work for me. I add try and empty catch block around add, insert, remove and clear methods. And inside catch i added todo comment, that remove try/catch after bug fix.
kbezzubov
on 26 Nov 2019
@samhouts Any ETA on when a fix will be available on this issue?
LeoJHarris
on 1 Dec 2019
I think this is fixed in latest 4.3.0.991221
LeoJHarris
on 4 Dec 2019
Yes i think so too
Codelisk
on 6 Dec 2019
Yes i think so too
It is not working in iOS versions below iOS 13. Always crashes on adding an item to the ObservabeCollection.
In Android, I'm not facing any issues as of now.
kumarc-123
on 8 Jan 2020
I can confirm this, it still fails on iphone6 ios 12
MoleDJ
on 19 Feb 2020
I encounter this error as well in a simple app that contains a Flyout item with a collection view. When navigating to another Flyout item and returning to the previous Flyout item with the collection view, the error is raised. I see this happening in the iPhone 11 simulator (iOS 13.3) and assume it happens on a device as well.
At the moment I don't know if there are any viable work-arounds for my situation.
wolf81
on 19 Feb 2020
@wolf81 I have the same problem, and I test it also in a physical iPhone 8 with iOS 13.4.1.
I have a CollectionView with a Header and Footer. The CollectionView is on the main screen, and it loads OK when open app. But as wolf81 describes, when go to another screen and get back to the screen with CollectionView it crashes:
at Foundation.NSObject.get_SuperHandle () [0x00012] in /Library/Frameworks/Xamarin.iOS.framework/Versions/13.16.0.13/src/Xamarin.iOS/Foundation/NSObject2.cs:449
at UIKit.UICollectionViewController.get_CollectionView () [0x0002a] in /Library/Frameworks/Xamarin.iOS.framework/Versions/13.16.0.13/src/Xamarin.iOS/UICollectionViewController.g.cs:1102
at Xamarin.Forms.Platform.iOS.ItemsViewController1[TItemsView].RemeasureLayout (Xamarin.Forms.VisualElement formsElement) [0x00076] in D:\a\1\s\Xamarin.Forms.Platform.iOS\CollectionView\ItemsViewController.cs:333
at Xamarin.Forms.Platform.iOS.ItemsViewController1[TItemsView].HandleFormsElementMeasureInvalidated (Xamarin.Forms.VisualElement formsElement) [0x00000] in D:\a\1\s\Xamarin.Forms.Platform.iOS\CollectionView\ItemsViewController.cs:348
at Xamarin.Forms.Platform.iOS.StructuredItemsViewController1[TItemsView].HandleFormsElementMeasureInvalidated (Xamarin.Forms.VisualElement formsElement) [0x00000] in D:\a\1\s\Xamarin.Forms.Platform.iOS\CollectionView\StructuredItemsViewController.cs:208
at Xamarin.Forms.Platform.iOS.ItemsViewController1[TItemsView].OnFormsElementMeasureInvalidated (System.Object sender, System.EventArgs e) [0x0000a] in D:\a\1\s\Xamarin.Forms.Platform.iOS\CollectionView\ItemsViewController.cs:342
at Xamarin.Forms.VisualElement.InvalidateMeasureInternal (Xamarin.Forms.Internals.InvalidationTrigger trigger) [0x0000b] in D:\a\1\s\Xamarin.Forms.Core\VisualElement.cs:824
at Xamarin.Forms.Grid.InvalidateMeasureInternal (Xamarin.Forms.Internals.InvalidationTrigger trigger) [0x00000] in D:\a\1\s\Xamarin.Forms.Core\Grid.cs:230
at Xamarin.Forms.Layout.OnChildMeasureInvalidated (Xamarin.Forms.VisualElement child, Xamarin.Forms.Internals.InvalidationTrigger trigger) [0x00086] in D:\a\1\s\Xamarin.Forms.Core\Layout.cs:351
at Xamarin.Forms.Layout.OnChildMeasureInvalidated (System.Object sender, System.EventArgs e) [0x00013] in D:\a\1\s\Xamarin.Forms.Core\Layout.cs:212
at Xamarin.Forms.VisualElement.InvalidateMeasureInternal (Xamarin.Forms.Internals.InvalidationTrigger trigger) [0x0000b] in D:\a\1\s\Xamarin.Forms.Core\VisualElement.cs:824
at Xamarin.Forms.VisualElement.set_IsPlatformEnabled (System.Boolean value) [0x0001c] in D:\a\1\s\Xamarin.Forms.Core\VisualElement.cs:539
at Xamarin.Forms.Platform.iOS.Platform+<>c.<.cctor>b__62_0 (Xamarin.Forms.BindableObject bindable, System.Object oldvalue, System.Object newvalue) [0x0000a] in D:\a\1\s\Xamarin.Forms.Platform.iOS\Platform.cs:31
at Xamarin.Forms.BindableObject.SetValueActual (Xamarin.Forms.BindableProperty property, Xamarin.Forms.BindableObject+BindablePropertyContext context, System.Object value, System.Boolean currentlyApplying, Xamarin.Forms.Internals.SetValueFlags attributes, System.Boolean silent) [0x00120] in D:\a\1\s\Xamarin.Forms.Core\BindableObject.cs:463
at Xamarin.Forms.BindableObject.SetValueCore (Xamarin.Forms.BindableProperty property, System.Object value, Xamarin.Forms.Internals.SetValueFlags attributes, Xamarin.Forms.BindableObject+SetValuePrivateFlags privateAttributes) [0x00173] in D:\a\1\s\Xamarin.Forms.Core\BindableObject.cs:397
at Xamarin.Forms.BindableObject.SetValue (Xamarin.Forms.BindableProperty property, System.Object value, System.Boolean fromStyle, System.Boolean checkAccess) [0x00042] in D:\a\1\s\Xamarin.Forms.Core\BindableObject.cs:334
at Xamarin.Forms.BindableObject.SetValue (Xamarin.Forms.BindableProperty property, System.Object value) [0x00000] in D:\a\1\s\Xamarin.Forms.Core\BindableObject.cs:311
at Xamarin.Forms.Platform.iOS.Platform.SetRenderer (Xamarin.Forms.VisualElement bindable, Xamarin.Forms.Platform.iOS.IVisualElementRenderer value) [0x00000] in D:\a\1\s\Xamarin.Forms.Platform.iOS\Platform.cs:239
at Xamarin.Forms.Platform.iOS.VisualElementPackager.OnChildAdded (Xamarin.Forms.VisualElement view) [0x00045] in D:\a\1\s\Xamarin.Forms.Platform.iOS\VisualElementPackager.cs:100
at Xamarin.Forms.Platform.iOS.VisualElementPackager.Load () [0x0001e] in D:\a\1\s\Xamarin.Forms.Platform.iOS\VisualElementPackager.cs:48
at Xamarin.Forms.Platform.iOS.VisualElementRenderer1[TElement].SetElement (TElement element) [0x000de] in D:\a\1\s\Xamarin.Forms.Platform.iOS\VisualElementRenderer.cs:277
at Xamarin.Forms.Platform.iOS.VisualElementRenderer1[TElement].Xamarin.Forms.Platform.iOS.IVisualElementRenderer.SetElement (Xamarin.Forms.VisualElement element) [0x00000] in D:\a\1\s\Xamarin.Forms.Platform.iOS\VisualElementRenderer.cs:157
at Xamarin.Forms.Platform.iOS.Platform.CreateRenderer (Xamarin.Forms.VisualElement element) [0x00014] in D:\a\1\s\Xamarin.Forms.Platform.iOS\Platform.cs:228
at Xamarin.Forms.Platform.iOS.TemplateHelpers.CreateRenderer (Xamarin.Forms.View view) [0x0001f] in D:\a\1\s\Xamarin.Forms.Platform.iOS\CollectionView\TemplateHelpers.cs:17
at Xamarin.Forms.Platform.iOS.TemplateHelpers.RealizeView (System.Object view, Xamarin.Forms.DataTemplate viewTemplate, Xamarin.Forms.ItemsView itemsView) [0x00046] in D:\a\1\s\Xamarin.Forms.Platform.iOS\CollectionView\TemplateHelpers.cs:45
at Xamarin.Forms.Platform.iOS.ItemsViewController1[TItemsView].UpdateView (System.Object view, Xamarin.Forms.DataTemplate viewTemplate, UIKit.UIView& uiView, Xamarin.Forms.VisualElement& formsElement) [0x00030] in D:\a\1\s\Xamarin.Forms.Platform.iOS\CollectionView\ItemsViewController.cs:368
at Xamarin.Forms.Platform.iOS.StructuredItemsViewController1[TItemsView].UpdateSubview (System.Object view, Xamarin.Forms.DataTemplate viewTemplate, System.nint viewTag, UIKit.UIView& uiView, Xamarin.Forms.VisualElement& formsElement) [0x0003a] in D:\a\1\s\Xamarin.Forms.Platform.iOS\CollectionView\StructuredItemsViewController.cs:116
at Xamarin.Forms.Platform.iOS.StructuredItemsViewController1[TItemsView].UpdateFooterView () [0x00000] in D:\a\1\s\Xamarin.Forms.Platform.iOS\CollectionView\StructuredItemsViewController.cs:94
at Xamarin.Forms.Platform.iOS.StructuredItemsViewRenderer2[TItemsView,TViewController].SetUpNewElement (TItemsView newElement) [0x00010] in D:\a\1\s\Xamarin.Forms.Platform.iOS\CollectionView\StructuredItemsViewRenderer.cs:48
at Xamarin.Forms.Platform.iOS.SelectableItemsViewRenderer2[TItemsView,TViewController].SetUpNewElement (TItemsView newElement) [0x00000] in D:\a\1\s\Xamarin.Forms.Platform.iOS\CollectionView\SelectableItemsViewRenderer.cs:34
at Xamarin.Forms.Platform.iOS.ItemsViewRenderer2[TItemsView,TViewController].OnElementChanged (Xamarin.Forms.Platform.iOS.ElementChangedEventArgs1[TElement] e) [0x0000c] in D:\a\1\s\Xamarin.Forms.Platform.iOS\CollectionView\ItemsViewRenderer.cs:36
at Xamarin.Forms.Platform.iOS.VisualElementRenderer1[TElement].SetElement (TElement element) [0x00122] in D:\a\1\s\Xamarin.Forms.Platform.iOS\VisualElementRenderer.cs:290
at Xamarin.Forms.Platform.iOS.VisualElementRenderer1[TElement].Xamarin.Forms.Platform.iOS.IVisualElementRenderer.SetElement (Xamarin.Forms.VisualElement element) [0x00000] in D:\a\1\s\Xamarin.Forms.Platform.iOS\VisualElementRenderer.cs:157
at Xamarin.Forms.Platform.iOS.Platform.CreateRenderer (Xamarin.Forms.VisualElement element) [0x00014] in D:\a\1\s\Xamarin.Forms.Platform.iOS\Platform.cs:228
at Xamarin.Forms.Platform.iOS.VisualElementPackager.OnChildAdded (Xamarin.Forms.VisualElement view) [0x0003e] in D:\a\1\s\Xamarin.Forms.Platform.iOS\VisualElementPackager.cs:99
at Xamarin.Forms.Platform.iOS.VisualElementPackager.Load () [0x0001e] in D:\a\1\s\Xamarin.Forms.Platform.iOS\VisualElementPackager.cs:48
at Xamarin.Forms.Platform.iOS.VisualElementRenderer1[TElement].SetElement (TElement element) [0x000de] in D:\a\1\s\Xamarin.Forms.Platform.iOS\VisualElementRenderer.cs:277
at Xamarin.Forms.Platform.iOS.VisualElementRenderer1[TElement].Xamarin.Forms.Platform.iOS.IVisualElementRenderer.SetElement (Xamarin.Forms.VisualElement element) [0x00000] in D:\a\1\s\Xamarin.Forms.Platform.iOS\VisualElementRenderer.cs:157
at Xamarin.Forms.Platform.iOS.Platform.CreateRenderer (Xamarin.Forms.VisualElement element) [0x00014] in D:\a\1\s\Xamarin.Forms.Platform.iOS\Platform.cs:228
at Xamarin.Forms.Platform.iOS.VisualElementPackager.OnChildAdded (Xamarin.Forms.VisualElement view) [0x0003e] in D:\a\1\s\Xamarin.Forms.Platform.iOS\VisualElementPackager.cs:99
at Xamarin.Forms.Platform.iOS.VisualElementPackager.Load () [0x0001e] in D:\a\1\s\Xamarin.Forms.Platform.iOS\VisualElementPackager.cs:48
at Xamarin.Forms.Platform.iOS.PageRenderer.ViewDidLoad () [0x0008f] in D:\a\1\s\Xamarin.Forms.Platform.iOS\Renderers\PageRenderer.cs:245
at (wrapper managed-to-native) ObjCRuntime.Messaging.IntPtr_objc_msgSendSuper(intptr,intptr)
at UIKit.UIViewController.get_View () [0x0002a] in /Library/Frameworks/Xamarin.iOS.framework/Versions/13.16.0.13/src/Xamarin.iOS/UIViewController.g.cs:3172
at Xamarin.Forms.Platform.iOS.PageRenderer.get_NativeView () [0x00000] in D:\a\1\s\Xamarin.Forms.Platform.iOS\Renderers\PageRenderer.cs:111
at Xamarin.Forms.Platform.iOS.PageRenderer.SetElement (Xamarin.Forms.VisualElement element) [0x0003d] in D:\a\1\s\Xamarin.Forms.Platform.iOS\Renderers\PageRenderer.cs:127
at Xamarin.Forms.Platform.iOS.Platform.CreateRenderer (Xamarin.Forms.VisualElement element) [0x00014] in D:\a\1\s\Xamarin.Forms.Platform.iOS\Platform.cs:228
at Xamarin.Forms.Platform.iOS.ShellSectionRootRenderer.LoadRenderers () [0x00028] in D:\a\1\s\Xamarin.Forms.Platform.iOS\Renderers\ShellSectionRootRenderer.cs:150
at Xamarin.Forms.Platform.iOS.ShellSectionRootRenderer.ViewDidLoad () [0x0006e] in D:\a\1\s\Xamarin.Forms.Platform.iOS\Renderers\ShellSectionRootRenderer.cs:67
at (wrapper managed-to-native) UIKit.UIApplication.UIApplicationMain(int,string[],intptr,intptr)
at UIKit.UIApplication.Main (System.String[] args, System.IntPtr principal, System.IntPtr delegate) [0x00005] in /Library/Frameworks/Xamarin.iOS.framework/Versions/13.16.0.13/src/Xamarin.iOS/UIKit/UIApplication.cs:86
at UIKit.UIApplication.Main (System.String[] args, System.String principalClassName, System.String delegateClassName) [0x0000e] in /Library/Frameworks/Xamarin.iOS.framework/Versions/13.16.0.13/src/Xamarin.iOS/UIKit/UIApplication.cs:65
at QueHH.iOS.Application.Main (System.String[] args) [0x00001] in /Users/jcsoluciones/app_queHH/QueHH/Codigo/LineaBase_ConShell/QueHH/QueHH.iOS/Main.cs:17`
Josecanalla
on 15 May 2020
@wolf81 I have the same problem, and I test it also in a physical iPhone 8 with iOS 13.4.1.
I have a CollectionView with a Header and Footer. The CollectionView is on the main screen, and it loads OK when open app. But as wolf81 describes, when go to another screen and get back to the screen with CollectionView it crashes:
at Foundation.NSObject.get_SuperHandle () [0x00012] in /Library/Frameworks/Xamarin.iOS.framework/Versions/13.16.0.13/src/Xamarin.iOS/Foundation/NSObject2.cs:449 at UIKit.UICollectionViewController.get_CollectionView () [0x0002a] in /Library/Frameworks/Xamarin.iOS.framework/Versions/13.16.0.13/src/Xamarin.iOS/UICollectionViewController.g.cs:1102 at Xamarin.Forms.Platform.iOS.ItemsViewController1[TItemsView].RemeasureLayout (Xamarin.Forms.VisualElement formsElement) [0x00076] in D:\a\1\s\Xamarin.Forms.Platform.iOS\CollectionView\ItemsViewController.cs:333
at Xamarin.Forms.Platform.iOS.ItemsViewController1[TItemsView].HandleFormsElementMeasureInvalidated (Xamarin.Forms.VisualElement formsElement) [0x00000] in D:\a\1\s\Xamarin.Forms.Platform.iOS\CollectionView\ItemsViewController.cs:348 at Xamarin.Forms.Platform.iOS.StructuredItemsViewController1[TItemsView].HandleFormsElementMeasureInvalidated (Xamarin.Forms.VisualElement formsElement) [0x00000] in D:\a\1\s\Xamarin.Forms.Platform.iOS\CollectionView\StructuredItemsViewController.cs:208
at Xamarin.Forms.Platform.iOS.ItemsViewController1[TItemsView].OnFormsElementMeasureInvalidated (System.Object sender, System.EventArgs e) [0x0000a] in D:\a\1\s\Xamarin.Forms.Platform.iOS\CollectionView\ItemsViewController.cs:342 at Xamarin.Forms.VisualElement.InvalidateMeasureInternal (Xamarin.Forms.Internals.InvalidationTrigger trigger) [0x0000b] in D:\a\1\s\Xamarin.Forms.Core\VisualElement.cs:824 at Xamarin.Forms.Grid.InvalidateMeasureInternal (Xamarin.Forms.Internals.InvalidationTrigger trigger) [0x00000] in D:\a\1\s\Xamarin.Forms.Core\Grid.cs:230 at Xamarin.Forms.Layout.OnChildMeasureInvalidated (Xamarin.Forms.VisualElement child, Xamarin.Forms.Internals.InvalidationTrigger trigger) [0x00086] in D:\a\1\s\Xamarin.Forms.Core\Layout.cs:351 at Xamarin.Forms.Layout.OnChildMeasureInvalidated (System.Object sender, System.EventArgs e) [0x00013] in D:\a\1\s\Xamarin.Forms.Core\Layout.cs:212 at Xamarin.Forms.VisualElement.InvalidateMeasureInternal (Xamarin.Forms.Internals.InvalidationTrigger trigger) [0x0000b] in D:\a\1\s\Xamarin.Forms.Core\VisualElement.cs:824 at Xamarin.Forms.VisualElement.set_IsPlatformEnabled (System.Boolean value) [0x0001c] in D:\a\1\s\Xamarin.Forms.Core\VisualElement.cs:539 at Xamarin.Forms.Platform.iOS.Platform+<>c.<.cctor>b__62_0 (Xamarin.Forms.BindableObject bindable, System.Object oldvalue, System.Object newvalue) [0x0000a] in D:\a\1\s\Xamarin.Forms.Platform.iOS\Platform.cs:31 at Xamarin.Forms.BindableObject.SetValueActual (Xamarin.Forms.BindableProperty property, Xamarin.Forms.BindableObject+BindablePropertyContext context, System.Object value, System.Boolean currentlyApplying, Xamarin.Forms.Internals.SetValueFlags attributes, System.Boolean silent) [0x00120] in D:\a\1\s\Xamarin.Forms.Core\BindableObject.cs:463 at Xamarin.Forms.BindableObject.SetValueCore (Xamarin.Forms.BindableProperty property, System.Object value, Xamarin.Forms.Internals.SetValueFlags attributes, Xamarin.Forms.BindableObject+SetValuePrivateFlags privateAttributes) [0x00173] in D:\a\1\s\Xamarin.Forms.Core\BindableObject.cs:397 at Xamarin.Forms.BindableObject.SetValue (Xamarin.Forms.BindableProperty property, System.Object value, System.Boolean fromStyle, System.Boolean checkAccess) [0x00042] in D:\a\1\s\Xamarin.Forms.Core\BindableObject.cs:334 at Xamarin.Forms.BindableObject.SetValue (Xamarin.Forms.BindableProperty property, System.Object value) [0x00000] in D:\a\1\s\Xamarin.Forms.Core\BindableObject.cs:311 at Xamarin.Forms.Platform.iOS.Platform.SetRenderer (Xamarin.Forms.VisualElement bindable, Xamarin.Forms.Platform.iOS.IVisualElementRenderer value) [0x00000] in D:\a\1\s\Xamarin.Forms.Platform.iOS\Platform.cs:239 at Xamarin.Forms.Platform.iOS.VisualElementPackager.OnChildAdded (Xamarin.Forms.VisualElement view) [0x00045] in D:\a\1\s\Xamarin.Forms.Platform.iOS\VisualElementPackager.cs:100 at Xamarin.Forms.Platform.iOS.VisualElementPackager.Load () [0x0001e] in D:\a\1\s\Xamarin.Forms.Platform.iOS\VisualElementPackager.cs:48 at Xamarin.Forms.Platform.iOS.VisualElementRenderer1[TElement].SetElement (TElement element) [0x000de] in D:\a\1\s\Xamarin.Forms.Platform.iOS\VisualElementRenderer.cs:277
at Xamarin.Forms.Platform.iOS.VisualElementRenderer1[TElement].Xamarin.Forms.Platform.iOS.IVisualElementRenderer.SetElement (Xamarin.Forms.VisualElement element) [0x00000] in D:\a\1\s\Xamarin.Forms.Platform.iOS\VisualElementRenderer.cs:157 at Xamarin.Forms.Platform.iOS.Platform.CreateRenderer (Xamarin.Forms.VisualElement element) [0x00014] in D:\a\1\s\Xamarin.Forms.Platform.iOS\Platform.cs:228 at Xamarin.Forms.Platform.iOS.TemplateHelpers.CreateRenderer (Xamarin.Forms.View view) [0x0001f] in D:\a\1\s\Xamarin.Forms.Platform.iOS\CollectionView\TemplateHelpers.cs:17 at Xamarin.Forms.Platform.iOS.TemplateHelpers.RealizeView (System.Object view, Xamarin.Forms.DataTemplate viewTemplate, Xamarin.Forms.ItemsView itemsView) [0x00046] in D:\a\1\s\Xamarin.Forms.Platform.iOS\CollectionView\TemplateHelpers.cs:45 at Xamarin.Forms.Platform.iOS.ItemsViewController1[TItemsView].UpdateView (System.Object view, Xamarin.Forms.DataTemplate viewTemplate, UIKit.UIView& uiView, Xamarin.Forms.VisualElement& formsElement) [0x00030] in D:\a\1\s\Xamarin.Forms.Platform.iOS\CollectionView\ItemsViewController.cs:368
at Xamarin.Forms.Platform.iOS.StructuredItemsViewController1[TItemsView].UpdateSubview (System.Object view, Xamarin.Forms.DataTemplate viewTemplate, System.nint viewTag, UIKit.UIView& uiView, Xamarin.Forms.VisualElement& formsElement) [0x0003a] in D:\a\1\s\Xamarin.Forms.Platform.iOS\CollectionView\StructuredItemsViewController.cs:116 at Xamarin.Forms.Platform.iOS.StructuredItemsViewController1[TItemsView].UpdateFooterView () [0x00000] in D:\a\1\s\Xamarin.Forms.Platform.iOS\CollectionView\StructuredItemsViewController.cs:94
at Xamarin.Forms.Platform.iOS.StructuredItemsViewRenderer2[TItemsView,TViewController].SetUpNewElement (TItemsView newElement) [0x00010] in D:\a\1\s\Xamarin.Forms.Platform.iOS\CollectionView\StructuredItemsViewRenderer.cs:48 at Xamarin.Forms.Platform.iOS.SelectableItemsViewRenderer2[TItemsView,TViewController].SetUpNewElement (TItemsView newElement) [0x00000] in D:\a\1\s\Xamarin.Forms.Platform.iOS\CollectionView\SelectableItemsViewRenderer.cs:34
at Xamarin.Forms.Platform.iOS.ItemsViewRenderer2[TItemsView,TViewController].OnElementChanged (Xamarin.Forms.Platform.iOS.ElementChangedEventArgs1[TElement] e) [0x0000c] in D:\a\1\s\Xamarin.Forms.Platform.iOS\CollectionView\ItemsViewRenderer.cs:36
at Xamarin.Forms.Platform.iOS.VisualElementRenderer1[TElement].SetElement (TElement element) [0x00122] in D:\a\1\s\Xamarin.Forms.Platform.iOS\VisualElementRenderer.cs:290 at Xamarin.Forms.Platform.iOS.VisualElementRenderer1[TElement].Xamarin.Forms.Platform.iOS.IVisualElementRenderer.SetElement (Xamarin.Forms.VisualElement element) [0x00000] in D:\a\1\s\Xamarin.Forms.Platform.iOS\VisualElementRenderer.cs:157
at Xamarin.Forms.Platform.iOS.Platform.CreateRenderer (Xamarin.Forms.VisualElement element) [0x00014] in D:\a\1\s\Xamarin.Forms.Platform.iOS\Platform.cs:228
at Xamarin.Forms.Platform.iOS.VisualElementPackager.OnChildAdded (Xamarin.Forms.VisualElement view) [0x0003e] in D:\a\1\s\Xamarin.Forms.Platform.iOS\VisualElementPackager.cs:99
at Xamarin.Forms.Platform.iOS.VisualElementPackager.Load () [0x0001e] in D:\a\1\s\Xamarin.Forms.Platform.iOS\VisualElementPackager.cs:48
at Xamarin.Forms.Platform.iOS.VisualElementRenderer1[TElement].SetElement (TElement element) [0x000de] in D:\a\1\s\Xamarin.Forms.Platform.iOS\VisualElementRenderer.cs:277 at Xamarin.Forms.Platform.iOS.VisualElementRenderer1[TElement].Xamarin.Forms.Platform.iOS.IVisualElementRenderer.SetElement (Xamarin.Forms.VisualElement element) [0x00000] in D:\a\1\s\Xamarin.Forms.Platform.iOS\VisualElementRenderer.cs:157
at Xamarin.Forms.Platform.iOS.Platform.CreateRenderer (Xamarin.Forms.VisualElement element) [0x00014] in D:\a\1\s\Xamarin.Forms.Platform.iOS\Platform.cs:228
at Xamarin.Forms.Platform.iOS.VisualElementPackager.OnChildAdded (Xamarin.Forms.VisualElement view) [0x0003e] in D:\a\1\s\Xamarin.Forms.Platform.iOS\VisualElementPackager.cs:99
at Xamarin.Forms.Platform.iOS.VisualElementPackager.Load () [0x0001e] in D:\a\1\s\Xamarin.Forms.Platform.iOS\VisualElementPackager.cs:48
at Xamarin.Forms.Platform.iOS.PageRenderer.ViewDidLoad () [0x0008f] in D:\a\1\s\Xamarin.Forms.Platform.iOS\Renderers\PageRenderer.cs:245
at (wrapper managed-to-native) ObjCRuntime.Messaging.IntPtr_objc_msgSendSuper(intptr,intptr)
at UIKit.UIViewController.get_View () [0x0002a] in /Library/Frameworks/Xamarin.iOS.framework/Versions/13.16.0.13/src/Xamarin.iOS/UIViewController.g.cs:3172
at Xamarin.Forms.Platform.iOS.PageRenderer.get_NativeView () [0x00000] in D:\a\1\s\Xamarin.Forms.Platform.iOS\Renderers\PageRenderer.cs:111
at Xamarin.Forms.Platform.iOS.PageRenderer.SetElement (Xamarin.Forms.VisualElement element) [0x0003d] in D:\a\1\s\Xamarin.Forms.Platform.iOS\Renderers\PageRenderer.cs:127
at Xamarin.Forms.Platform.iOS.Platform.CreateRenderer (Xamarin.Forms.VisualElement element) [0x00014] in D:\a\1\s\Xamarin.Forms.Platform.iOS\Platform.cs:228
at Xamarin.Forms.Platform.iOS.ShellSectionRootRenderer.LoadRenderers () [0x00028] in D:\a\1\s\Xamarin.Forms.Platform.iOS\Renderers\ShellSectionRootRenderer.cs:150
at Xamarin.Forms.Platform.iOS.ShellSectionRootRenderer.ViewDidLoad () [0x0006e] in D:\a\1\s\Xamarin.Forms.Platform.iOS\Renderers\ShellSectionRootRenderer.cs:67
at (wrapper managed-to-native) UIKit.UIApplication.UIApplicationMain(int,string[],intptr,intptr)
at UIKit.UIApplication.Main (System.String[] args, System.IntPtr principal, System.IntPtr delegate) [0x00005] in /Library/Frameworks/Xamarin.iOS.framework/Versions/13.16.0.13/src/Xamarin.iOS/UIKit/UIApplication.cs:86
at UIKit.UIApplication.Main (System.String[] args, System.String principalClassName, System.String delegateClassName) [0x0000e] in /Library/Frameworks/Xamarin.iOS.framework/Versions/13.16.0.13/src/Xamarin.iOS/UIKit/UIApplication.cs:65
at QueHH.iOS.Application.Main (System.String[] args) [0x00001] in /Users/jcsoluciones/app_queHH/QueHH/Codigo/LineaBase_ConShell/QueHH/QueHH.iOS/Main.cs:17`
Updating to Xamarin.Forms 4.6.0.726 solved the problem
Josecanalla
on 15 May 2020
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Most helpful comment
It is fixed but the PR is not merged yet :(
The problem happens if you modify the ObservableCollection by insertions and deletions.
However, you can avoid that by replacing the whole ObservableCollection by creating a clone of the original collection, modify the clone, and assign ItemsSource the new modified clone.
This should resolve the problem temporarily.