Something you’ll notice when using WatchKit is that the classes within WatchKit have many similarities to those within UIKit.
Here’s a nice guide by Matt Thompson that provides a nice chart overviewing the different WatchKit classes and their UIKit equivalents.
In the guide Matt also highlights the important differences you’ll run into when using WatchKit vs UIKit providing a number of different coding examples and explaining the most important conceptual differences in-depth.
You can find the WatchKit guide over on the NSHipster blog.
A nice guide for those getting started with WatchKit.
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