Who developed the iOS system and what architecture does it have? How are software updates released? What are the advantages and disadvantages of Apple's closed ecosystem?
Who developed the iOS system and how does it work?
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iOS is developed by Apple's own engineers and operates on a fundamentally UNIX-based architecture (XNU/Darwin kernel + Cocoa Touch UI layer). Updates are rolled out in specific cycles based on device models and hardware compatibility, with new features first introduced to the latest hardware and then optimized backward.
The advantage of this closed ecosystem is that all components work seamlessly together, but the downside is the limited options for third-party hardware/software and the requirement for everyone to comply with the same standards.