Matt RicketsonSwiftUI’s new type-checking enhancements (`@ContentBuilder`) and lazy `@State` are the culmination of literally years of careful effort behind the scenes to solve some of the biggest everyday pain points in SwiftUI development.
At this point, there are millions of lines of SwiftUI result builder and state code shipping in production. With these changes, every one of those lines of code will suddenly compile differently, improving both compilation and runtime performance, and most developers *will never even notice*.
That doesn’t normally happen. Maintaining binary, source, and backwards compatibility across releases imposes strict limitations on how SDK APIs can evolve. If you think of a better way to compile some library DSL syntax after shipping it publicly, you’re usually out of luck.
These enhancements were only possible because of dedicated engineers on the Swift and SwiftUI teams working closely together, sweating the subtlest of details, and persevering through countless dead-end experiments and fraught internal deployments.
Their reward? That future developers will *not* see some type-check error or performance hitch, and will *never* have to know that it ever worked any differently.
But that’s wonderful. We love it. The joy is in the doing.
Thank you Sam Lazarus, @dduan, @holly, Pavel Yaskevich, and others from the Swift and SwiftUI teams for getting these enhancements over the finish line! (I’m no longer at Apple but can’t help but brag about these talented people 👏🏻)
唐鳳 Audrey Tang
gloriouscow
Tom Forsyth
Ignacio Castaño🍉