Adding Complications to the Gallery

In watchOS 3 and later, users can configure multiple watch faces in the gallery area of the Apple Watch app on iPhone. To add your complication to the gallery, you must create a complication bundle that gives the user a preview of your complication. The complication bundle is stored in your iOS app bundle and used by the Apple Watch app to populate the gallery area. Each complication bundle includes localizable, static previews of the complications that you build using the ClockKit framework. Follow the steps below to create your complication bundle and add it to your iPhone app.

In your Complications controller code, implement getLocalizableSampleTemplateForComplication:withHandler:. In your implementation, build the templates by using text or image provider calls. For example:
[CLKSimpleTextProvider localizableTextProviderWithStringsFileTextKey:@“AKey”]
Important:
The keys that you use in the text provider calls should appear in the localized strings files named ckcomplication.strings, and the strings files should also be in your WatchKit extension target.
Launch your app in Watch Simulator and make sure that your app is frontmost.
In Watch Simulator, choose File > Save Complication Bundle.

Xcode generates a complication bundle and gives it the name that you enter. For example, MyBundleName.ckcomplication.
Add the generated complication bundle to your iPhone app.

Important:
You must add the complication bundle as a resource to the top level of your iPhone app—don't add it to your watchOS app or extension. When you add the bundle, be sure to select “Create folder references” in the “Choose options for adding these files” Xcode dialog.
In Xcode, launch your app on iPhone.

When you launch the Apple Watch app and go to the gallery area, you should see an entry for your app.