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When HasUnevenRows is set to true on iOS, the ItemAppearing event fires for all items in the list even if they haven't appeared (presumably because they're loaded in order to measure them)
The problem is though that this breaks my infinite scrolling which I think is the main usecase for the ItemAppearing event.
I think the bug is basically the same as 21153, except that it only occurs if HasUnevenRows = true.
Workaround is to set ListView.RowHeight and also set HasUnevenRow to false - http://forums.xamarin.com/discussion/35604/listview-ios-hasunevenrows-true-and-observablecollection
I can confirm that ItemAppearing is fired for items that didn't appear if we set height on a cell to be bigger than 44, but i didn't get the event to fire for all items of the list, can you provide your sample use case to help us better figure the issue.
Thank you for taking the time to submit this report. After reviewing the description of this bug, we believe it no longer affects the current version of Xamarin.Forms. If you are still experiencing the issue after updating your packages, please reopen this report with an attached reproduction.
For your convenience, we have created some reproduction best practices viewable here: https://gist.github.com/jassmith/92405c300e54a01dcc6d
Xamarin Forms Team