IOS Study Notes (III)-iOS System Architecture

The system architecture of iOS is divided into four layers: Core OS layer, Core Services layer, and Media layer) and Cocoa Touch layer ). The following figure shows the IOS system structure.

IOS Structure

1. Core OS is the Core operating system layer located at the bottom of the iOS system architecture. It includes memory management, file system, power management, and some other operating system tasks. It can directly interact with hardware devices. As an app developer, you do not need to deal with this layer.

2. Core Services is the Core service layer, which can be used to access some iOS Services.

3. Media is the Media layer. Through this layer, we can use various Media files in an application to record audio and video, draw images, and create basic animation effects.

4. Cocoa Touch is a touchable layer. This layer provides various useful frameworks for application development, and most of them are related to user interfaces, essentially, it is responsible for user touch interaction on iOS devices.

IOS is based on the UNIX kernel, android is based on the Linux kernel, and iOS and android are two excellent mobile phone operating systems. They have similarities and differences. The following is a picture of the android system architecture:

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