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Initializing an UI element in viewDidLoad, which has not been defines as optional nor has been initialized in Init() function.
Sigiloso
The key in these questions is to cover the fundamentals, and be ready for the back-and-forth with the interviewer. Might be worth doing a mock interview with one of the Pandora or ex-Pandora IOS Developer experts on Prepfully? They give real-world practice and guidance, which is pretty helpful. prepfully.com/practice-interviews