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According to Apple's press info about the release of iOS 8.2 and Xcode 6.2 found here, they mention developers being able to use the new technologies presented with the Apple Watch:
With the iOS 8.2 beta SDK, developers can now start using WatchKit to create breakthrough new apps, Glances and actionable notifications designed for the innovative Apple Watch interface and work with new technologies such as Force Touch, Digital Crown and Taptic Engine.
After combing through the WatchKit framework documentation, I have found no mention of using the Taptic Engine. Is there a way for developers to use it? Perhaps they haven't implemented that yet and it may come in a later update for iOS 8.2, but I don't think this is the case. What am I missing?
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What is the Taptic Engine on Apple Watch? Taptic Engine is a linear actuator inside Apple Watch. This piece of hardware taps the user on the wrist to deliver tactile feedback when interfacing the Digital Crown or Force Touch. It will also deliver a tap to help notify the user of alerts and notifications.
The Taptic Engine is a component manufactured by Apple that uses haptic technology to provide users with tactile feedback to simulate actions, such as clicks on a stationary touch screen.
One of the most interesting and overlooked parts of Apple's switch from familiar to the futuristic, though, is the effort that went into their Taptic Engine. This work helped Apple move away from physical buttons without alienating too many fans, while also making their watches and laptops feel responsive.
Currently in watchOS 2 beta 1, you can now use the WKInterfaceDevice.currentDevice().playHaptic(.Click) API to play haptic feedback on your Watch App.
You can find a full guide here on how to use this new API: http://www.sneakycrab.com/blog/2015/6/22/haptic-feedback-with-the-taptic-engine-in-watchkit-and-watchos-2-wkinterfacedevice-and-wkhaptic
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