Since July 2018, Apple has announced to developers that all iOS applicati updates must support iOS 11, as well as the iPhone X Super Retina display. If an update of an applicati after July does not meet these requirements, it will be rejected by the App Store.
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In applicatis that do not take in ch arge the iPhone X, it displays black bars the screen. But no more, as Apple told developers:
iOS 11 offers innovative features and the redesigned App Store to hundreds of millis of customers around the world. Your apps can offer smarter, unified and immersive experiences with Core ML, ARKit, new camera APIs, new SiriKit domains, Apple Music integrati, iPad drag-and-drop, and more. As of July 2018, all iOS applicati updates sent to the App Store must be generated with the iOS 11 SDK and must support Super Retina display of the iPhone X
This ccerns applicati updates. iPhone X as of April 2018.
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