This document does not list every design related video on WWDC. I've skipped some since I believe they are oriented on people new to design or to Apple ecosystem. I curated this document for experienced iOS designers.
- Platforms State of the Union This session is not primarly focused on design, but it gives you a great overview of what is currently possible in the Apple Ecosystem
- What’s New in iOS 11 Video focused on the slightly updated iOS visual language
- Designing for a Global Audience
- Communication Between Designers and Engineers
- Designing Across Platforms
- Designing Sound
- Designing for Subscription Success
- Planning a Great Apple Watch Experience
- Writing Great Alerts
- Get Started with Display P3
- Apple Design Awards
- Designing for tvOS
- Designing Great Apple Watch Experiences
- Inclusive App Design
- Iterative UI Design
- Typography and Fonts
Not necessarily UI/UX design related, still very interesting though.
- Marvel: Making a Difference in the Real World
- Disability and Innovation: The Universal Benefits of Accessible Design
- Talking In Pictures: Reconstructing the Building Blocks of Language
- Tapping into Innovative Solutions to Save the World’s Wildlife
- Apple Design Awards
- Designing for Future Hardware
- iOS Accessibility
- Apple Pay Within Apps
- Monetize and Promote Your App with iAd
- Improving the Full Screen Window Experience
- Introducing the New System Fonts
- Think Audacious
- Apple Watch Design Tips and Tricks
- Designing with Animation
- Apple Design Awards
- Accessibility on iOS
- Accessibility on OS X
- Adapting Your App to the New UI of OS X Yosemite
- Creating Great App Previews
- Designing a Great In-App Purchase Experience
- Designing Intuitive User Experiences
- Making a Great First Impression With Strong Onboarding Design
- Prototyping: Fake It Till You Make It
- Your App, Your Website, and Safari