Apple Watch apps became 64-bit due to ‘Bitcode’ feature
Apps developed for the Apple Watch transitioned from 32-bit to 64-bit last month thanks to the ‘Bitcode’ feature hidden in Xcode.
The feature was added to Xcode 7 three years ago in November 2015. While optional for iOS apps, it was mandatory for watchOS and tvOS. Now we know why,
Rather than update and recompile each app for 64-bit, Bitcode sits between human-written code and machine code to prevent this being necessary. Bitcode provides a partially-compiled app to Apple which can be completed...