If you are preparing for a IOS interview, Must go through these questions series.Here you will find latest interview Questions and answers on IOS Frameworks and tools.
IOS is an Operating system is for Mobile Devices. It is second most popular and widely used mobile operating system after Android. It was created and developed by Apple Inc.
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Objective-C is an object-oriented coding language that attaches Smalltalk-style messaging to the C language and was the main language approved by Apple for macOS, iOS, and their respective application programming interfaces, Cocoa and Cocoa Touch, until 2014. Portable Objective-C programs that do not use Apple libraries can be compiled for any system supported by GNU Compiler Collection (GCC) and Objective-C source code implementation program files usually have .m filename extensions, while Objective-C header/interface files have .h extensions; Objective-C++ files are expressed with a .mm file extension.
Swift is an interactive programming language for creating IOS Application that combines the best in modern language thinking with concepts from the Apple engineering culture and the diverse contributions from its open-source community. Moreover, the compiler is optimized for performance and the language is optimized for development, without compromising on either.
Cocoa Touch is the application development environment for building programs to run on iOS, watchOS, and tvOS from Apple Inc and provides an abstraction layer of iOS and is based on the macOS Cocoa API toolset and is originally written in the Objective-C language. It allows the use of hardware and features that are not found in macOS computers and just like Cocoa, Cocoa Touch reflects a Model-View-Controller (MVC) software architecture and contains a separate set of graphical control elements from Cocoa. Moreover, means for generating applications based on Cocoa Touch are included in the iOS SDK.
The structure of iOS is a layered structure and an iOS architect is one who designs this layered architecture, and at the uppermost level iOS works as an intermediary between the underlying hardware and the apps; apps do not interact with the underlying hardware directly. Apps talk with the hardware through a collection of well-defined system interfaces and these interfaces make it manageable to write apps that work regularly on devices having multiple hardware abilities. Lower layers deliver the basic services which all application relies upon and higher-level layer provides sophisticated graphics and interface-related services.