Working with watchOS Simulators
The idea of a multi-platform project won’t come as a surprise to Apple Watch developers, because a watchOS project must always have multiple platform targets: one for the iOS app, and at least one for watchOS. In fact, there are usually several watchOS targets: one for the app, one for a notification handler, and possibly another for a complication.
Because watchOS apps are bundled with iOS apps, you don’t use the same-name scheme as described for tvOS apps that have iOS counterparts. Instead, you use a naming convention for the bundle identifiers: for app com.app.foo.FooApp, the watch app would be com.app.foo.FooApp.watchkitapp and its extensions (notification handler and complication) would be com.app.foo.FooApp.watchkitextension ...
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