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Context: Due to changes in the Swift runtime over the past years, methods that are considered "optional" in Objective-C need to have @objc annotations in order for Objective-C to be able to perform `respondsToSelector:` invocations. Problem: Many of our examples had not annotated their `catalogShouldHideNavigation` methods with the `@objc` annotation, causing the Catalog to wrap the examples in a container app bar view controller. The reason most of these examples would implement `catalogShouldHideNavigation` is because they are managing their own navigation (e.g. to demonstrate AppBar functionality), so this would often result in duplicate AppBars appearing in the example. The fix: All `catalogShouldHideNavigation` Swift methods have been annotated with `@objc`. Fixes https://github.com/material-components/material-components-ios/issues/7576 Fixes https://github.com/material-components/material-components-ios/issues/7578