XCode 9 GM Seed and iOS 11 GM Seed available now for iOS developers at https://developer.apple.com

Check them out!

As Apple say in their blog “You can now submit your apps that take advantage of exciting new features available in the next release of macOS, iOS, watchOS, and tvOS. Build your apps using Xcode 9 GM seed, test with the latest releases of macOS High Sierra, iOS 11, watchOS 4, tvOS 11, and submit them for review.”

Here are the steps you need to pass to submit your app developed in Xcode 9:

  1. Build with Xcode 9 and the latest SDKs. (Download Xcode 9 or XCode 9 GM Seed)
  2. Update to the latest operating systems.
  3. Review guidelines.
  4. Optimize your app.
  5. Beta test.
  6. Update your product page in iTunes Connect.
  7. Submit for review.

For more info about the steps visit: https://developer.apple.com/app-store/submissions/

Check out 2 new videos dedicated especially to Designing your apps to iPhone X

Designing for iPhone X Video

Building Apps for iPhone X Video

Read this Article (https://developer.apple.com/iphone/)

Read Human Interface Guidlines updated to the new iOS 11: