As you can see, when I swipe to see the context actions in the collectionview, the searchbar flicks. Same story when, in a popover, i change the PreferredContentSize.
Strange visual effect of the searchbar
Maybe if you post your code we could spot the issue and help you fix it?
What kind of code? I mean, it's a collection view with contextual actions.. and e NavigatinItem with Searchcontroller.