According to blogger John Gruber on his Daring Fireball site, Apple’s rumored “Project Marzipan,” which will deliver macOS support to iOS apps, will likely debut in 2019, not 2018. It had previously been speculated that it would be unveiled at this year’s Apple Worldwide Developer Conference.
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“I’m nearly certain this project is not debuting at WWDC 2018 in June, and I doubt that 2018 was on the table in December,” he writes. “It’s a 2019 thing, for MacOS 10.15 and iOS 13.1 I would set your expectations accordingly for this year’s WWDC.”
Regarding “Project Marzipan” (which isn’t the current code name of the initiative, per Gruber): both Bloomberg News and Axios have said that Apple plans “universal apps” for 2018. Such apps would work on both iOS and macOS. will work with a touchscreen or mouse and trackpad depending on whether it’s running on the iPhone and iPad operating system or on a Mac
Currently, developers have to develop apps separately the iOS or the macOS. Unifying the apps could help the iOS and macOS platforms “evolve and grow as one, and not one at the expense of the other,” Steven Troughton-Smith, an app developer, tells Bloomberg News. “This would be the biggest change to Apple’s software platform since iOS was introduced.”
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