Completed
Last Updated: 31 Jan 2024 08:57 by ADMIN
Release 2024 Q1
The exception is easily reproducible in SDK Browser on iOS. Start the LoadOnDemandCommand or LoadOnDemandEvent example to see the exception. The LoadOnDemandCollection seems to work correctly, however.

The ListViewLoadOnDemandCollection can be used instead of the command/event as a temporary workaround, until the bug gets fixed.
Completed
Last Updated: 20 Sep 2023 08:44 by ADMIN
Release R2 2023 SP1
MonoTouchException is thrown when using LoadOnDemand with ListViewLoadOnDemandCollection on iOS 16.
Completed
Last Updated: 19 Jul 2023 14:24 by ADMIN
Release R2 2023 SP1

Exception occurs when there are no items in the collection and load on demand mode is automatic: 

public ViewModel()
{
    this.Source = new ObservableCollection<string>();
    //for (int i = 0; i < 14; i++)
    //{
    //    this.Source.Add(string.Format("Item {0}", i));
    //}
    this.LoadItemsCommand = new Command(this.LoadItemsCommandExecute);
}

Completed
Last Updated: 19 Jul 2023 14:24 by ADMIN
Release R2 2023 SP1
Null Reference Exception is thrown when the ListView is initially grouped and navigating back to page where is the ListView and new RangeCollection is assigned to the control.
Completed
Last Updated: 19 Jul 2023 14:23 by ADMIN
Release R2 2023 SP1
The ListView items are not rendered correctly when manual load on demand is used.
Completed
Last Updated: 09 Nov 2022 15:50 by ADMIN
Release R3 2022 SP1
Null Reference Exception is thrown when the ListView is initially grouped with more than 1 group descriptor and then the control is populated using Range Observable collection. 
Completed
Last Updated: 28 Oct 2022 05:58 by ADMIN
Release R3 2022.3.1026

With iOS 16 some changes are introduced to the UICollectionView. This breaks the layout of the ListView with dynamically sized items.

Completed
Last Updated: 13 Apr 2021 11:57 by ADMIN
Release 2021.1.413 (R1 2021 minor release)
If ListView has PressedItemStyle defined and the end user holds onto any control, such as Label, for example, placed outside ListView, the PressedItemStyle is applied to all items. Can only be reproduced on Android.
Completed
Last Updated: 13 Apr 2021 11:56 by ADMIN
Release 2021.1.413 (R1 2021 minor release)
When you have Automatic LoadOnDemandMode enabled and use LoadOnDemand event to load the items,  the event is fired multiple times unnecessarily.
Completed
Last Updated: 24 Feb 2021 15:05 by ADMIN
Release R1 2021 SP1

After I updated to `2021.1216.1-hotfix` (to solve this problem in Android and Google Material) the RadListView's LoadOnDemand automatic  stopped working 

 

Workaround:

I've had to downgrade Xamarin.Google.Android.Material to v1.1.0.5 and use the latest stable release of Telerik UI v2021.1.119.1 which restored the functionality.


Completed
Last Updated: 07 Dec 2020 16:10 by ADMIN
Release 2020.3.1207 (R3 2020 minor release)

Changing a property on an item that is involved with grouping and sorting and then removing and re-adding the item to the collection results in the list being in an invalid state (e.g. duplicate items, incorrect template, etc.)

Error message can be reproduced on iPhone 11 Simulator iOS 13.6 

[UICollectionView] Invalid update: invalid number of items in section 0.  The number of items contained in an existing section after the update (4) must be equal to the number of items contained in that section before the update (4), 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). - will perform reloadData. UICollectionView instance: <TKCollectionView: 0x7f8525b86600; baseClass = UICollectionView; frame = (0 0; 414 725); clipsToBounds = YES; autoresize = W+H; gestureRecognizers = <NSArray: 0x600001232bb0>; layer = <CALayer: 0x6000019b0520>; contentOffset: {0, 0}; contentSize: {414, 453}; adjustedContentInset: {0, 0, 0, 0}; layout: <TKListViewLinearLayout: 0x7f8524f5e400>; dataSource: <Telerik_XamarinForms_DataControlsRenderer_iOS_TKExtendedListView: 0x7f8524f5b590; frame = (0 0; 414 725); layer =
 <CALayer: 0x6000019b03a0>>>; currentUpdate: [UICollectionViewUpdate - 0x7f8526897fc0: old:<UICollectionViewData: 0x6000025f4000> new<UICollectionViewData: 0x6000025f47e0> items:<(
    "I(0,3)"
)>]

 

Completed
Last Updated: 22 Oct 2020 15:32 by ADMIN
Release R3 2020 SP1
Cannot access a disposed object exception on Samsung Galaxy 8 and Galaxy 10
Completed
Last Updated: 13 May 2020 13:14 by ADMIN
Release R2 2020
Currently, the behaviors differ in Android/iOS and UWP. In UWP you can have an empty collection and the LoadOnDemand will trigger when you open the page with the ListView, in iOS/Android you need to have some items in the collection for the LoadOnDemand event to trigger.
Completed
Last Updated: 13 May 2020 13:14 by ADMIN
Release R2 2020
When LoadOnDemandMode is set to "Automatic" and LoadOnDemand event is used to load items asynchronously, the event is fired multiple times with a single gesture.
Completed
Last Updated: 13 May 2020 13:14 by ADMIN
Release R2 2020
When LoadOnDemand feature is enabled and you're using LoadOnDemand event to add more items asynchronously, the loading indicator is not shown and it is not clear to the end user that any action is currently processed. 
Completed
Last Updated: 13 May 2020 13:14 by ADMIN
Release R2 2020
With Automatic LoadOnDemand, once all items are loaded and IsLoadOnDemandEnabled is set to false, when I scroll till the end the loading indicator keeps flickering on knowing that no more items are called.
Completed
Last Updated: 13 May 2020 13:13 by ADMIN
Release R2 2020
FooterTemplate is not displayed correctly
Completed
Last Updated: 13 May 2020 13:13 by ADMIN
Release R2 2020

ListViewLoadOnDemandCollection method is not triggering in iOS automatically when there is a need to display the items on the screen. We have to manually scroll the list view then the ListViewLoadOnDemandCollection triggers and give further data to show. 

Things are working fine on Android platform.

Completed
Last Updated: 13 May 2020 13:13 by ADMIN
Release R2 2020
ADMIN
Created by: Lance | Manager Technical Support
Comments: 2
Category: ListView
Type: Bug Report
3
The LoadOnDemandItemTemplate's HorizontalOptions setting is ignored on Android, it will always be left aligned.

See this screenshot for comparison of 3 target platforms side-by-side: https://www.screencast.com/t/K5oWBcP0dLQM

The DataTemplate is as follows:
<telerikDataControls:RadListView.LoadOnDemandItemTemplate>
    <DataTemplate>
        <Grid BackgroundColor="Red" 
                   HorizontalOptions="End">
             <Label FontSize="24"
                         HorizontalOptions="End"
                         Text="Load more items"
                         TextColor="Black" />
        </Grid>
    </DataTemplate>
</telerikDataControls:RadListView.LoadOnDemandItemTemplate>
Completed
Last Updated: 20 Mar 2020 13:22 by ADMIN
Release 2020.1.313 (R1 2020 minor release)
As soon the user tries to swipe more than one list item at the same time on iOS, the swiping functionality is not properly handled/
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