Technical Architecture of mobile Internet applications-Ios

IOS originated from UNIX and evolved from Mach and BSD, which is stable.
First layer (bottom layer)Core OS)

Including memory management, file system, power management, and some other operating system tasks.

You can directly interact with hardware devices. The core operating system layer includes the following components:

OS X Kernel Mach 3.0 BSD

Sockets power MGMT File System

Keychain certificates Security

Bonjour

Layer 2 core services)

It can be used to access IOS core services such as address book and network. Includes the following components:

Collections Address Book networking

File Access SQLite core location

Net Services threading preferences

URL utilities

Media)

You can access media files to record audio and video, draw images, and create basic animation effects. Includes the following components:

Core audio OpenGL audio mixing

Audio recording video playback JPG, PNG, Tiff

PDF quartz core Animation

OpenGL ES

Layer-4 (top layer) Application Framework (cocoa touch)

This layer provides various useful frameworks for our application development,

Most of them are related to the user interface. Essentially, it is responsible for the user's touch interaction operations on iOS devices. It includes the following components:

Multi-touch events core motion camera

View hierarchy localization alerts

Web views image picker multi-touch controls

Programming Languages and tools

IOS programming uses objective-C language and is developed based on ansi c/smalltalk. The development tool is the apple xcode series.

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