Since Xamarin Forms Listview now reuses cells in iOS (as it should) one small piece was overlooked. The reused cells now displays previously displayed images for a short while until the new image is downloaded.
This behavior is mitigated by a cache, so once an image is loaded it’s set instantly the next time the cell is displayed.
I’ve also filed a bug with a sample project available at https://bugzilla.xamarin.com/show_bug.cgi?id=28628 and the sample project to visualize the issue at here.
There are a number of ways around this.
Suggestion one – half-way around
Suggestion two – wrap it
Wrap your image in a custom control and handle all the loading and caching yourself.
Suggestion three – rewrite it
Write your own Image-renderer from scratch to take into account when an image is fetched from the cache or not to enable a nice fade in. This is what I hope will come out of the bug report.