RadListView ScrollToIndex with grouping Crashes ios

[dottodot]

I know this has been raised before but I cannot get scrollToIndex to work without my app crashing.

Even settimeout doesn't work for me.

If I have a list of 20 items (3 of which are visible on the screen at once) anything upto the index of 4 is ok anything above that the app crashes.

If it's any help scrollByAmount is fine for example

scrollWithAmount(index * height)

trouble is my items all have different heights so it would not be accurate doing this.

I think the problem is that the indexing is getting affected by the grouping.

If you look at the following example

https://play.nativescript.org/?template=play-ng&id=JwNDWX&v=2

Try to scroll to index 10 and you'll get an error or ERROR: ERROR Error: attempt to scroll to invalid index path change it to something lower such as 4 and it works.

Please provide the following version numbers that your issue occurs with:

• Progress NativeScript UI version: 5.2.0
• CLI: 5.2.1
• Cross-platform modules: 5.2.2
• Runtime(s): 5.2.0

[tsonevn]

Hi @dottodot,
Thank you for the provided sample project. I was able to recreate the issue. I will mark it as a bug and we will investigate it further.

[dottodot]

OK thanks, I'm not sure if it related but tkListViewHeader doesn't display when grouping is enabled, it seems like grouping has a few strange side effects. I've updated the sample project so you can see that as well. And there is this issue regarding it #950

[elena-p]

Fixed with 6.2.0