WWDC23 just happened and here is my ranking of the 5 most impactful announcements to iOS app developers.

Here are some WWDC 2023 sessions that are free to watch if you want to explore some of these topics in greater detail.

Write Swift Macros:
https://developer.apple.com/wwdc23/10166

Build an App with Swift Data:
https://developer.apple.com/wwdc23/10154

Develop Your First Immersive App:
https://developer.apple.com/wwdc23/10203

Bring Widgets to Life:
https://developer.apple.com/wwdc23/10028

Explore SwiftUI Animations:
https://developer.apple.com/wwdc23/10156