Apple on Wednesday told developers that all new and updated iPhone and iPad apps that are submitted to the App Store on or after March 27,2019 must be built using the iOS 12.1 SDK or later and provide support fo the iPhone XS Max and/or the most recent model of the 12.9-inch iPad Pro. The Cupertino firm will also require screenshots for those device with the submission.
In addition, all new Apple Watch apps and updates will now need to be built using the watchOS 5.1 SDK or later and provide support for the Apple Watch Series 4.
iOS 12 is now running on more than 80% of devices worldwide. Make sure your app delivers a great user experience by seamlessly integrating with the latest advances in iOS. Starting March 27, 2019, all new apps and app updates for iPhone or iPad, including universal apps, must be built with the iOS 12.1 SDK or later and support iPhone XS Max or the 12.9-inch iPad Pro (3rd generation). Screenshots for these devices will also be required. All new apps and app updates for Apple Watch will need to be built with the watchOS 5.1 SDK or later and support Apple Watch Series 4.
Developers are also advised that iOS 12 and tvOS 12 require apps to use memory far more efficiently than before. Developers that are having difficulty in reducing their app’s memory requirements can contact Apple to request an entitlement for their app to use iOS 11-style memory accounting.