How do I support large tab bar previews in iOS 11?

Question

In some of Apple's apps like Photos in iOS 11 if you hold down on a tab bar icon while your phone is in landscape and you have the larger accessibility size Dynamic Text turned on a large preview of the tab you are holding appearing. How do I support this in my app? Is it a new API or do I have to build it myself?

Answer 1

You can use PDF image assets and get large tab bar preview behavior for free.

Check the "Preserve Vector Data" button in the attributes inspector for the PDF image asset.

https://developer.apple.com/videos/play/wwdc2017/204/