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Discuss the contrasts between synchronous and asynchronous methods in iOS programming.

Design the system for the iOS Calendar appI would appreciate it if you could develop a UI that resembles the iOS calendar. Your task is to create a custom layout for the collection view, particularly focusing on the frameForCellAtIndexPath method. This method is responsible for calculating the frame for each cell in the collection view.

Discuss the navigation flow between view controllers within an iOS application.

What is your understanding of threads within iOS development, and how are they utilized?

What are the techniques for executing concurrent tasks in iOS?

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