Flickering while scrolling in ios

Question

I am using sfListview in my app. The app scrolls to a pre selected item in the middle of the list.

When I scroll down, scrolling is smooth but when I scroll up or use iOS scroll to the top gesture, there's lot of flickering.

Items reloading. I have tried both of caching strategies.

I have attached a video of the issue.

Gurmeet

Attachment: sfListview.mp4_610ba912.zip

Lakshmi Natarajan · Accepted Answer

Hi Gurmeet, 
 
Thank you for using Syncfusion products. 
 
We have checked the reported query “SfListview scroll flickers on ios” from our side.  We would like to inform you that, as per the implementation of SfListView architecture, If the programmatic scrolling is applied to a particular item index when the item is in AutoFitMode, the scroll offset calculated based on default ItemSize (40d). So, when scroll up the item after programmatically scroll to the particular index, items dynamic height will be calculated based on the actual item size which caused the flicker. This is the expected behavior in SfListView.   
  
Hence, we suggest you to use ItemSize when using programmatic scrolling while loading.  
  
If you still facing issues, kindly share the following details which would help us to analyze better and provide you the appropriate solution as soon as possible,  

Share ListView templates
Share programmatic scrolling code snippets
Share ListView and Xamarin.Forms versions
 
Regards, 
Lakshmi Natarajan