> I don't have a good answer, but I think this may be more that UIImage caches 
> the images, not UIImageView. Maybe you can find something in UIImage's 
> docs/headers?

I think you may be on to something.  This WWDC 
<https://developer.apple.com/videos/play/wwdc2018/219> session covers 
optimizing UIImage performance and has some info on what UIImage caches.

How are you creating the UIImage?  Are you retaining the UIImage anywhere 
outside of the UIImageView? 
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