You can find the related blog post on Medium at Container View Controllers Redux
In general the sample code covers the use of container view controller in iOS development to illustrate the concepts of separation of concerns, composition, and the application controller pattern.
The app uses the concept of Coordinators to handle the navigation flow of the app.
The sample code uses view controller containment to combine an image loading view controller and a table view controller to form a screen of content.
The sample code shows an example of a scrolling container view controller. The container view controller overrides load view to use a UIScrollView where it displays the contents of injected view controllers
The sample code shows an example an example of a stack view container view controller. Similar to the scrolling view controller, this view controller overrides loadView to implement a UIStackView that holds the contents of two view controllers. The stack view controller is then added to a scrolling view controller to allow content scrolling.
The sample code shows an example of using a container view controller to hold a screen of content and interactively display a separate card view controller. This example illustrates an alternative to coordinators by encapsulating the functionality of two view controllers into a single view controller. This concept could be extend to encapsulte application flows in a container view controller.
