More about the hardware
We get the screen sizes and pixel densities for both sizes of Apple Watch. App designers will have to design the app to work on both screen sizes. Both displays fall into the "retina" display section.
New ways to interact
Apple is introducing lots of new principles when it comes to bonding with the Apple Watch (and how the Apple Watch interacts with the owner).
Digital Crown: A twist on the traditional crown on a watch. Allows for scrolling through longer pages of information.
Digital Touch: The Heartbeat and Sketch features that allow for individual communication.
Tactic Engine: Subtle, physical feedback associated with alerts and onscreen interaction.
Force Touch: Physical gesture - quite simply, a press - interpreted by hardware. The display not only detects a touch, but can also sense the force.
Short Look notification: A minimum alert that only displays more information "if the wearer remains engaged."
Glances: Information displayed by apps in an easy-to-access, swipe-able interface.
Apps don't run natively
Apps won't run native on the Apple Watch, at least not originally. Alternatively, when the user taps on an app on their Apple Watch, it launches a WatchKit extension on their iPhone and attaches to each other that way. This enables messages to be sent from the app on the iPhone to the app on the Apple Watch until the user stops interacting with the app.
Not only does this transfer the bulk of the work to the iPhone, it means less of a battery drain on the Apple Watch (although how much additional battery drain this will put on the iPhone remains to be seen).
Two app interface styles
Apple is offering two layout styles for apps:
Hierarchical: This will be similar to how the Mail app works in iOS
Page-based: Similar to how the Stocks or Weather app works under iOS.
Menus
Apps will support simple menus, which allows developers to make better use of the restricted screen real estate. Users will be able to bring up menus using the Force Touch gesture.
However, they are not scrollable so they can't be used too seriously.
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