Should TARGETED_DEVICE_FAMILY include iPad (2) for an iPhone-only app to properly support the foldable inner display?

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Created 3d

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This post is from the Activity iPhone Duo UIKit Q&A.

Our app declares TARGETED_DEVICE_FAMILY = 1 (iPhone only), yet the unfolded inner display presents a .regular horizontal size class identical to iPad's, and our project also carries a leftover INFOPLIST_KEY_UISupportedInterfaceOrientations_iPad override. Does Apple recommend/require declaring iPad as a supported family for apps that want to support this device properly, or is "iPhone-only + regular size class" the intended long-term model?

Answer 1

Frameworks Engineer OP

Apple

2d

While it is strongly recommended that apps support both iPhone and iPad, you are not required to support iPad to support the iPhone Duo as its device idiom is still .phone.

In iOS 27, iPhone apps on both the iPhone Duo and iPhone Mirroring (in macOS 27) will see iPhone apps have regular size classes when resized. Apps are recommended to support more flexible layouts, and to use system container view controllers where possible to better support these configurations. Your app should support every orientation where possible.

I'd highly recommend checking out videos from the iPhone Duo tech talks and WWDC26 to better understand the design and engineering recommendations on modernizing your app in resizable environments. Two notable videos worth watching are Modernize your UIKit app and Prepare your app for iPhone Duo.