ITC Infotech Senior IOS Developer Interview Questions and Answers

App Life Cycle refers to the sequence of events that occur from the time an app is launched until it is terminated.

• App is launched by user or system

• App enters foreground and becomes active

• App enters background when user switches to another app or locks the device

• App may be terminated by the system to free up resources

• App can be brought back to foreground by user or system events

Extension of enum allows adding new cases, computed properties, and methods to an existing enum type.

• Extensions can be used to add new functionality to existing enum types without modifying their original implementation.

• New cases, computed properties, and methods can be added to an enum using extensions.

• Extensions can also be used to conform an enum to a protocol.

Delegate methods of URL session are used to handle various events during network requests.

• Delegate methods are used to handle authentication challenges, background session events, and data tasks.

• Examples include URLSessionDelegate, URLSessionDataDelegate, URLSessionTaskDelegate.

• Delegate methods can be used to handle redirects, caching policies, and response validation.

SSL pinning is a security measure used to prevent man-in-the-middle attacks by validating the server's SSL certificate.

• Implement SSL pinning by embedding the server's SSL certificate within the app's code.

• During the SSL handshake, compare the server's certificate with the embedded certificate to ensure they match.

• If the certificates match, the connection is considered secure and the data exchange can proceed.

• SSL pinnin...read more

Classes are reference types, structs are value types. GCD is low-level API, Operation queue is high-level API for concurrency.

• Classes are reference types, stored on the heap. Structs are value types, stored on the stack.

• GCD is a low-level API for managing concurrent operations. Operation queue is a high-level API built on top of GCD.

• GCD provides a simple and efficient API for dispatching tasks to a queue. Operation que...read more

My expected salary range is $100,000 - $120,000 per year based on my experience and skills.

• Based on my 5+ years of experience in IOS development, I am looking for a competitive salary in the range of $100,000 - $120,000 per year.

• I have a strong track record of delivering high-quality IOS applications and believe my skills warrant a salary in this range.

• I am open to negotiation based on the overall compensation package

SOLID principles are a set of five design principles that help make software designs more understandable, flexible, and maintainable.

• Single Responsibility Principle (SRP) - A class should have only one reason to change.

• Open/Closed Principle (OCP) - Software entities should be open for extension but closed for modification.

• Liskov Substitution Principle (LSP) - Objects of a superclass should be replaceable with objects o...read more