Start with Swift and Xcode, because Swift is the primary language for iOS apps and Xcode is the only official IDE. Learn the fundamentals first, then move to building UI with SwiftUI or UIKit, fetching data from APIs, and storing data locally, building a tiny app after every new concept. Apple's own free tutorials are enough to begin, so you don't need to spend money on day one. In India, hiring managers at product companies value working apps on GitHub or the App Store far more than certificates, so focus on shipping projects rather than only watching videos.

A practical sequence is: Swift fundamentals, SwiftUI and UIKit basics, networking and JSON handling, Core Data and local storage, Git and GitHub, data structures and algorithms, and finally mock interviews and applications. Expect around 8–12 months of consistent effort if you are starting from zero. Once you can build and publish a complete app, start applying off-campus to product companies and well-funded startups in cities like Bangalore, Hyderabad, and Pune, and keep one portfolio project ready to discuss in depth.

Not natively, because Xcode runs only on macOS, and any app you publish to the App Store must be built and signed on a Mac. The common workarounds are renting a cloud Mac by the hour, using a Mac mini as the cheapest entry point, or building with cross-platform frameworks like Flutter or React Native on Windows. Even with cross-platform tools you will still need Mac access for final builds and submission, so if iOS is your career goal, budgeting for a Mac mini or a used MacBook is the realistic route.

A course gives you structure, but on its own it is rarely enough, because interviews in India typically test DSA, Swift fundamentals, architecture, and sometimes mobile system design along with your practical work. Use a course as the skeleton, then build two or three substantial apps, contribute to open source if possible, and practise explaining your technical decisions out loud. Candidates who combine a course with real projects and mock interview practice consistently outperform those who only complete course videos.

Xcode is the non-negotiable one — its editor, Interface Builder, simulator, and debugger will be your daily environment. On top of that, learn Git with GitHub, Swift Package Manager or CocoaPods for dependencies, Instruments for profiling memory and performance, a proxy tool like Charles or Proxyman for debugging API calls, and TestFlight with Firebase or Crashlytics for releases and crash reporting. Getting comfortable with the Xcode debugger early pays off, since many product companies include practical debugging or pairing rounds in their hiring process.

For new apps, yes — Swift is the standard that product companies expect, and interviews are almost always conducted in Swift. That said, many banks and older Indian apps still run large Objective-C codebases, so being able to read Objective-C is a genuine advantage even in 2026-era hiring. Cross-platform languages like Dart for Flutter or JavaScript for React Native are separate career paths; if you are targeting iOS Engineer roles specifically, invest your time in Swift along with both SwiftUI and UIKit.

Expect deep dives into ARC and memory management, retain cycles, closures, value versus reference types, concurrency with GCD and async/await, view lifecycles, table and collection view performance, architecture patterns like MVVM or VIPER, offline handling, and testing. Senior rounds usually add DSA plus one or two mobile system design rounds where you design something like a feed or a chat app. The key difference at the experienced level is that interviewers want trade-off reasoning and real examples from your projects, not textbook definitions, so prepare stories from your own codebase.

Swift, in almost every product company interview today, including questions on optionals, generics, protocol-oriented programming, and modern concurrency. Objective-C usually appears only as reading legacy code or migration scenarios at companies maintaining older apps. Prepare and practise in Swift, keep enough Objective-C familiarity to read a file comfortably, and be ready for a growing number of SwiftUI questions, since teams adopting it are now screening for it.

Several well-maintained repositories compile iOS interview questions by topic and experience level, and they work best as checklists rather than answer banks. For every question you cannot answer confidently, build a tiny demo — for example, actually create a retain cycle in a playground and fix it with a weak reference. Be careful with community-written answers, because Swift changes quickly and older explanations are often outdated, so always verify against current documentation or your own experiments.

Mobile system design focuses on architecting the client side of an app — layering, offline-first behaviour, caching, image loading, pagination, push notifications, and battery and network efficiency — while backend system design centres on servers, databases, load balancing, and scaling. In a mobile-focused round you might be asked to design a chat app, news feed, or driver app from the phone's perspective, including how it behaves on a flaky 4G connection. Strong candidates explicitly discuss the API contract with the backend and the trade-off between data freshness and data usage.

Learn a repeatable structure: clarify requirements and scale, sketch a high-level component diagram, then deep-dive into areas like caching, pagination, image pipelines, offline sync, and real-time updates. Rehearse the recurring prompts — news feed, chat, photo upload, ride-hailing driver app — until you can drive the discussion yourself. Most importantly, do timed mocks with senior mobile engineers, because in these rounds communication and how you handle pushback on your design decisions decide the outcome as much as the design itself.

Dedicated books for this niche are rare, and the one most people recommend is Mobile System Design Interview: An Insider's Guide, which walks through classic prompts like feeds and chat step by step. Pair the book with engineering blogs from large app companies, since real posts on caching, offline support, and image pipelines show how these trade-offs play out in production. Reading alone rarely converts into offers, so combine it with timed mock practice where you present and defend a design on a whiteboard or shared document.

It depends on your starting point — a structured course or book is useful for learning the vocabulary and frameworks quickly, but the real score improvement comes from practising designs out loud and defending them under questioning. A sensible mix is one structured resource for concepts, followed by three to five mock interviews on prompts like a news feed or chat, with honest feedback after each. If you have senior mobile colleagues, peer mocks cost nothing; structured mentoring from someone who has sat on the interviewer's side helps when you need that outside perspective.