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Outline the strategies for navigating view controllers in an iOS interface.

How would you tackle the challenge of designing an iOS competitor app to Etsy?

Provide an in-depth overview of the different methodologies for executing asynchronous method calls in iOS. Explore the role and purpose of completion handlers, dissect the intricacies of async/await, and touch upon other valuable techniques leveraged to proficiently handle asynchronous tasks.

What strategies would you employ to build a photo sharing app that can accommodate millions of users?

Discuss the role of threading in the execution of iOS apps.