- Core OS ( or Application) Layer: Core OS Layer sits directly on top of the device hardware and is the bottom layer of the iPhone OS stack. In addition to basic operating system services, such as memory management, handling of file systems, and threads, this layer provides low-level networking, access to external accessories, etc.
- Service Layer: Its purpose is to design the services that upper layers or users demand. Among its other essential features are block objects, Grand Central Dispatch, in-app purchases, and iCloud storage. The service layer has been strengthened by the addition of ARC Automatic Reference Counting.
- Media Layer: It handles media like video, audio, graphics, etc. The media layer will allow us to use all graphics, video, and audio technology of the system.
- Cocoa Touch Layer: It is also known as the application layer. This is the place where frameworks are created when applications are built. In addition, it functions as the interface for iOS users to work with the operating system. This includes touch and motion capabilities.
iOS Interview Questions and Answers
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