Preview in Xcode not showing images from assets library

You have to do three steps:

1. Open Xcode. Go to window and choose projects. From new menu choose delete derived data.

2. Remove image from assets library. Set it again and link it to image view.

3. Click cmd+shift+k to clean your project. After that run your app or put it in preview seen.

Try to check "target membership" of Assets.xcassets file.

1. Choose Assets.xcassets folder.
2. in File Inspector - Target Membership should be checked.