When any control (Frame, for example) with applied Margin is placed inside GroupHeaderTemplate of the ListView, the Margin value is not respected on iOS.

Hi,

On Android, I am using a DataTemplateSelector and a DataTemplate that has a switch on it that the user can press. When the user presses the switch the ListView starts corrupting the data in the list. The item being interacting with starts appearing in other locations on the list.

This issue can be reproduced in the Telerik SDKBrowser project.

Select the following : ListView -> Cell Types -> Template Cell Selector - Xaml

Mark Item1 as special using the button. Scroll down and you will see that an item in the list has been replaced by Item 1 which is now in the list twice.

Regards

Anthony

 

NullReferenceException is thrown on item property change when ItemStyleSelector is applied

When an ItemTemplateSelector is applied to the ListView, the item must be refreshed on each property change, to give the ItemTemplateSelector a chance to re-evaluate its logic. This causes the item to flicker on iOS, because it appears with its default size initially, and then it gets resized during the measure/layout phase. Specifying a fixed ItemLength in the LayoutDefinition can work around the problem, if dynamic item sizing is not needed.

If you have a more complex HeaderTemplate containing input controls, each button placed after a certain position does not fire its Click event.  If a button is placed at the top of the template, it functions properly.

NullReferenceException is thrown when navigating back from a page with ListView and Prism Navigation is used.

When entering a value into an entry in the TemplateCell it is not scrolling up the ListView to allow view of the entry.  This causes the soft keyboard to overlap the entry and the user cannot view what they are entering. 

The ListView items are not rendered correctly when manual load on demand is used.

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.

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.

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.

MonoTouchException is thrown when using LoadOnDemand with ListViewLoadOnDemandCollection on iOS 16.

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)"
)>]

 

Cannot access a disposed object exception on Samsung Galaxy 8 and Galaxy 10

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.

When setting HorizontalItemSpacing or VerticalItemSpacing to the layout, the item spacing appears to be applied twice to the item. 
When setting BackgroundColor to the ItemStyle the background leaks beyond the boundaries of the item.

Available in minor release 2018.3.1109. It will also be available in the R1 2019 release.

Available in minor release 2018.3.1109. It will also be available in the R1 2019 release.

Add support for GroupKey of ListView to be complex object, allowing to display more complex information in the group headers.

Available in the R2 2018 release.

Expose events for the Items reorder API