What are the four layers of the iOS system architecture? Which layer does the UIKIT framework belong

Qianfeng Buckle Ding School ios development for you to answer:

1、core

OS layer: It is located at the lowest level of the iOS framework and mainly includes kernel, file system, network infrastructure, security management, power management, device drivers, thread management, and memory management. In short, this layer provides the lowest-level, system-level services.

2、core

Services Layer: It can be called the core service layer, as the name suggests, it provides services such as string management, collection management, network operations, URL tools, contact management, preferences, etc. In addition to this, it also provides a lot of services based on hardware features, such as GPS, accelerometer, gyroscope, etc.

This layer contains cores

location, core motion, systemconfiguration, foundation, and core

foundation submodule. The foundation and core foundation submodules provide an abstraction of common data types (strings, collections, etc.), core

The Core Data submodule in Foundation implements object graph management and object persistence.

3. Media layer: depends on core

The functions provided by the services layer are mainly responsible for graphics and multi-services. It includes coregraphics, core text, opengl es, and core

4、cocoa

Touch Layer: It is the support that provides various basic functions directly to iOS applications. Among them, the uikit framework is used by various visual control programs, such as windows, views, view controllers, and various user controls.

In addition, UIKIT defines the default behavior and event handling structure of the application.

iOS (InternetWorking Operating System-Cisco, abbreviated as IOS, also written as IOS), Cisco network configuration system. iOS is a complex operating system optimized for interconnected networks - similar to a local area operating system (NOS), such as Novell's Netware, optimized for LANS. iOS provides a single set of rules for cost-effectively maintaining an Internet network over a long period of time.

In short, it is a software architecture that is decoupled from hardware and can be dynamically upgraded to adapt to changing technologies (hardware and software) as network technologies continue to evolve.

iOS can be thought of as an interconnected hub: a highly intelligent administrator who manages the functions of controlling complex distributed network resources.

IOS provides customers with investment protection in their information infrastructure. Many of the features that iOS supports today are the ones that most customers will need in the future. As a company grows and expands into new territories, with the complexity of the infrastructure that comes with mergers and acquisitions, as well as the emergence of protocol shifts or new traffic models, iOS provides an architecture that gives organizations the flexibility to apply change and cost-effectively scale to meet new needs.

IOS allows our clients to quickly adapt to new models and maintain their information infrastructure investments for longer; The result is investment protection and a lower cost of ownership over time.

The Apple system is iOS, just like the Windows system of our computer.

That is, Apple's mobile devices include iPhone, iPad

At present, it is iPhone, iPad, and iPod.

1:**Processor: such as CPU, former 387 floating-point coprocessor, etc. 2 Internal memory:

Memory 3 External memory: such as hard disks, floppy disks, optical discs and some tape drives, etc. 4 Input devices: keyboard, mouse, scanner, microphone voice control, camera are counted 5 Output devices:

printers, monitors, and more.

iOS stands for iPhone OS, and iPhone OS is an operating system developed by Apple for iPhone. It is mainly for iPhone and iPod touch. Just like the Mac OS X operating system on which it is based, it is also based on Darwin.

The system architecture of iPhone OS is divided into four layers: the core OS layer, the core services layer, the media layer, and the cocoa touch layer. System operations take up about 512MB of storage space.

iOS was first announced at Apple's MacWorld show on January 9, 2007, followed by the first version of the iOS operating system released in June of the same year

x”。Initially, no one understood the potential value and prospects of "iPhone running OS X", so there was no software company and no software developer who gave "iPhone running OS."

x" to develop software or provide software support. So, Steve, Apple's CEO at the time. Steve Jobs persuaded software companies and developers to build low-cost web applications (web) first

iphone os

is made by Apple.

An operating system developed for the iPhone. It is mainly for iPhone and iPod touch

Use. Just like the Mac OS X operating system on which it is based, it is also based on Darwin. The system architecture of iPhone OS is divided into four levels:

The Core OS Layer, the Core Services Layer, the Media Layer, and the Cocoa Touch Layer. System operations take up about 512MB of storage space.

iOS is a registered trademark of Cisco's network equipment operating system, and Apple's name change has been authorized by Cisco.

The full name of iOS is iPhone or iPad Operating System, which translates to iPhone or iPad operating system.