10+ IOS Application Developer Interview Questions and Answers

Find the first occurrence of a given number in a sorted array.

• Use binary search to efficiently find the first occurrence of the number.

• Keep track of the index of the first occurrence as you search through the array.

• Return the index of the first occurrence once found.

Creating UI/UX design based on figma for iOS application development.

• Understand the design requirements from figma.

• Implement the design using iOS design guidelines.

• Ensure the design is user-friendly and intuitive.

• Test the design on different iOS devices for compatibility.

• Iterate on the design based on feedback.

• Use tools like Sketch or Adobe XD for design implementation.

Design a Twitter feed using SOLID principles

• Separate classes for each responsibility (Single Responsibility Principle)

• Use interfaces to define behavior and allow for easy swapping of implementations (Open/Closed Principle)

• Dependency Injection to decouple components and make testing easier (Dependency Inversion Principle)

• Liskov Substitution Principle to ensure derived classes can be substituted for their base classes without affecting functionality

• Interface Segregation Princip...read more

High order functions are functions that can take other functions as arguments or return functions as results.

• High order functions can be used to create more flexible and reusable code.

• They allow for the composition of functions, making it easier to combine multiple operations.

• Examples of high order functions in iOS development include map, filter, and reduce.

Logics to solve patterns and ds

• Understand the problem statement and constraints

• Identify the pattern and try to generalize it

• Choose the appropriate data structure and algorithm

• Test the solution with different inputs and edge cases

NotificationCenter is a system that enables communication between different parts of an application.

• NotificationCenter allows components of an application to communicate without having direct references to each other.

• It uses the observer pattern where objects register themselves as observers for specific notifications.

• Notifications can be posted to the NotificationCenter with optional data.

• Observers can then receive and handle these notifications.

• NotificationCenter is commonl...read more

Find the 2nd largest element in an array of strings.

• Sort the array in descending order

• Access the element at index 1 to get the 2nd largest element

Protocols are a set of rules or guidelines that define a blueprint of methods, properties, and other requirements.

• Protocols are used to define a contract that classes or structs can adopt and conform to.

• They specify a list of methods and properties that must be implemented by conforming types.

• Protocols can be used to achieve polymorphism and code reuse.

• They can be adopted by multiple classes or structs, allowing them to share common behavior.

• Protocols can also be used to defi...read more

The App Store release process involves submitting the app for review, ensuring it meets guidelines, and waiting for approval.

• Submit the app for review through App Store Connect

• Ensure the app meets Apple's guidelines and requirements

• Wait for approval from Apple before the app can be published

• Consider factors like app store optimization (ASO) and marketing strategies for a successful launch

A class is a blueprint for creating objects that have properties and methods. A structure is a lightweight version of a class.

• Classes and structures are used to define the properties and behavior of objects in object-oriented programming.

• Classes can be inherited, while structures cannot.

• Classes are reference types, while structures are value types.

• Classes have a deinitializer, while structures do not.

• Examples: Class - UIViewController, Structure - CGPoint