Ahead of the iPhone 5s’s launch later this week, Apple has put up a notice for developers to start submitting 64-bit compatible App Store apps. One of the iPhone 5s’s marquee features is a new 64-bit A7 processor that improves gaming and speed performance across the system and apps. Apple’s notice to developers:
You can submit 64-bit apps for iOS 7 today that take advantage of the power of iPhone 5s. Xcode can build your app with both 32-bit and 64-bit binaries included so it works across all devices running iOS 7. If you wish to continue to support iOS 6 then you will need to build for 32-bit only. Next month we will be making changes that will allow you create a single app binary that supports 32-bit on iOS 6, as well as 32-bit and 64-bit on iOS 7.
Notably, it appears that 64-bit apps will (currently) need to be separate applications from those that are 32-bit and iOS 6 compatible. However, Apple says that next month, changes will be made to allow for a universal apps that run on both iOS 6 and iOS 7, regardless of the supported (32 bit or 64 bit) architecture. We reported that Apple is already working on iOS 7.1, so perhaps the changes will appear in that update.