The two primary programming languages, Swift and Objective-C, as well as Apple's integrated development environment, Xcode, are among the hardest skills an iOS Developer should possess. You'll need to be familiar with the syntax and interoperability of these languages, as well as how to write if and switch statements, manage classes, inheritance, and initialization, and handle errors.
On the front end, iOS Developers should be familiar with interface design, information hierarchy, and organization, and UI / UX design; all of these factors can influence how the app looks and how users communicate with it.
You'll also want to be familiar with Apple's design and user interface guidelines, which are a collection of basic properties that iOS apps must follow or risk being removed from the App Store.
Software design, concurrency, reactive programming, how to deploy animations, and user testing are among the technical aspects you'll need to know as you advance to a Senior iOS Developer position.
In a nutshell, these are the skills that you must have:
• Objective-C and (or) Swift iOS native language proficiency;
• Apple Human Interface Guidelines awareness;
• Xcode IDE experience;
• UI / UX standards awareness;
• Advanced code versioning instruments proficiency;
• Core Data framework practical experience;
• Metal and OpenGL knowledge;
• APIs understanding and integration experience.