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How does concurrency work in iOS?

Sketch out a blueprint for a user-centric file manager app for iOS.

Design a news feed based app like Twitter

Explain how you would tackle the quality assurance process for a room plan app.

Can you explain the process of transitioning between view controllers in iOS?

Design the architecture for Spotify's app.

Examine the spectrum of options when it comes to implementing asynchronous method calls in iOS. Scrutinize the significance of completion handlers, delve into the practicality of async/await, and shed light on other noteworthy techniques utilized for handling asynchronous tasks.

Can you outline the process to find the common parent view for two UIViews in a hierarchy?

Can you explain the distinction between OperationQueue and GCD?

Share your approach to designing an iOS competitor app that can rival Etsy.