Stop Ignoring the Crease: Ship Your iOS App for iPhone Duo Before the April 2027 Deadline

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iPhone Duo for iOS developers: the new SDK and APIs, and what broke in a real app adapted on the simulator before the device went on sale.
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iPhone Duo is here. I adapted every screen of my app on the simulator and shipped the update before the device was on sale. In this article I go through the new APIs Apple added for the Duo and the non-obvious things that broke in my app along the way, plus what the April 2027 screenshot rule means for you.