NDA. But know trees, graphs (at least cursorily), the simpler data structures like arrays and dictionaries, Objective-C trivia like memory management and property types, and of course be prepared to talk about running times of your code. I would also recommend talking through your ideas for solutions before starting to code.
For the 1 hour technical, there were short coding challenges such as "how would you reverse a string". Whereas the 4-hour one was "here's an app, create some test coverage for it.
Describe your iOS experience.
Write a function to delete a node from a linked list.
Given a string determine if it is a palindrome. Ignoring capitalization and not counting white space.
They asked few general behavioural questions like all companies do but the algorithm questions were at leetcode level
Do you believe in a qa team!!? How should qa team be structured!!?
They asked about binary trees
It was a task to fix some issues in an iOS project
Find common ancestor of two views
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