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Apple Plans Combined iPhone, iPad and Mac Apps To Create One User Experience (bloomberg.com)
An anonymous reader shares a Bloomberg report: Apple's iPhone and iPad introduced a novel way of interacting with computers: via easy-to-use applications, accessible in the highly curated App Store. The same approach hasn't worked nearly as well on Apple's desktops and laptops. The Mac App Store is a ghost town of limited selection and rarely updated programs. Now Apple plans to change that by giving people a way to use a single set of apps that work equally well across its family of devices: iPhones, iPads and Macs. Starting as early as next year, software developers will be able to design a single application that works with a touchscreen or mouse and trackpad depending on whether it's running on the iPhone and iPad operating system or on Mac hardware, according to people familiar with the matter. Developers currently must design two different apps -- one for iOS, the operating system of Apple's mobile devices, and one for macOS, the system that runs Macs. With a single app for all machines, Mac, iPad and iPhone users will get new features and updates at the same time.
macOS and iOS use 2 different UI frameworks (CocoaTouch and UIKit, respectively). And this causes problems when trying to compile the source code between the two platforms. Ex: things like color and girth are defined specifically in each framework (NSFont and NSColor versus UIFont and UIColor). If they combine these frameworks, it makes the design and maintenance of cross platform software a lot easier (it'll still be difficult), and the at the very least, you wouldn't have to stub out a bunch of class names and files.
BUT - the most important work is still on the developer to ensure that their app runs great on iPhone, iPad and Mac and has a cohesive UI that scales and takes advantages of the different technologies. It's no different from Responsive Web Design or the shift from iPhone to iPad (and vice versa). Kudos to Apple for the courageous approach to their failure of an app store on desktop.