title: Reliable iOS image flipping for RTL languages
body: <p>I'm trying to get image flipping to work reliably, but i'm seeing some issues. I manage my images in an Xcode asset catalog, and the ones that need to be flipped in RTL languages have been configured with the 'Direction' property set to 'Left to right, Mirrors'.
  In some cases I have 2 separate assets, since flipping was not enough. Those are configured with the 'Direction' property set to 'Both' and two separate image assets are provided.
  All images are PDF assets with 'Preserve vector data' enabled.</p>
  <p>This all worked great as long as I test with iOS 11 and Xcode 9.2.
  The problems start when I test on iOS 9. Images that are configured for RTL don't show up when I launch the app, even when I'm not running in a RTL language.</p>
  <p>Since Xcode 9.3, I seem to have a new problem. The asset catalogs get updated automatically; the RTL images are reconfigured to direction 'Both' and changes are made to the json files in the catalog. Selecting 'Left to right, Mirrors' does not work anymore.</p>
  <p>Is there anyone who has figured out how to get this to work reliably? Or am I just looking at the latest bugs in Xcode and some old issues with iOS9?</p>
  <p>[edit]
  After further analysis of the IPA file that is generated, it seems that the Assets.car file does not contain .png files for the RTL images. It seems that they are not generated (since the source files are PDF), so that would explain the missing images in iOS 9 (which does not use PDF images).</p>