iOS is derived from OS X. The latter is open sourced but the former is proprietary.
IOS architecture consists of 4 layers. Cocoa Touch layer implementation the ui for application and provide support for touch based input and multitasking.
The media layer provide graphic, audio and video framework.
The core derives layer provide fundamental services for application such as location, iCloud and social media services.
The core OS layer provide networking , memory management, POSIX threading, filesystem etc.
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