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OSNavigationController is a open source re-implementation of UINavigationController. It currently features only a subset of the functionality of UINavigationController, but the long-term aim is to replicate 100% of the features.
OSNavigationController is not really intended to be used as-is. The idea is that you can fork it and then easily customize its appearance and behaviour to suit any special requirements that your app may have. Customizing OSNavigationController is much simpler than trying to customize UINavigationController due to the fact that the code is open and you don't need to worry about private methods, undocumented behavior, or implementation changes between versions.
Check out this lovingly crafted Apple Music-style popup library. SPAlert is written in clean, beautiful, modern Swift code by Ivan Vorobei, a prolific and talented open source developer.
This open source project contains a ton of preset styles, including "done," "heart," "message," and more. If the presets don't fit your needs, you can customize the popups with custom images and duration. Includes support for light and dark modes, and installable via Swift Package Manager and CocoaPods.