WatchKit In-Depth, Part 1 – WWDC15

WWDC15watchOS 2 provides a new architecture that runs your WatchKit extension directly on Apple Watch. Take an in-depth look at how this new architecture works. Learn how to migrate existing WatchKit apps to watchOS 2, how to support both versions of watchOS, and hear about updates to Glances and Notifications.

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WWDC 2015 > App Frameworks > WatchKit In-Depth, Part 1