The document outlines the architecture of iOS, detailing its four main layers: Core OS, Core Services, Media Services, and Cocoa Touch. Each layer is described with key components, such as frameworks and functionalities, noting best practices like using higher-level APIs and adhering to naming conventions. It emphasizes the importance of MVC (model-view-controller) in app design and development.

1. iOS ARCHITECTURE
&
DESIGN GUIDE
Daniel D09 Oct 2018

2. Hardware
Software
Core OS
Core Services
Media Services
Cocoa Touch
LAYERS OF iOS ARCHITECTURE

3. 1. Core OS Layer
Core Bluetooth
Accelerate
Security Services
- Large calculations, image processing, DSP
Overriding is unsupported
I/O Kit

4. 2. Core Services Layer
Foundation
- Obj C wrapper of C based core foundation
- Base layer of functionalities
Specialised Frameworks
- CoreLocation
- CloudKit
- CallKit
- CFNetwork

5. 3. Media Services Layer
Graphics
Video
Audio
- CoreGraphics, CoreText, QuartzCore, OpenGLES
- CoreAudio, AudioToolbox, AudioUnit, AVFoundation
- CoreVideo, ImageIO, AssetsLibrary, MediaPlayer

6. 4. Cocoa Touch Layer
UIKit Framework
- Primarily written in obj C
- Parent of all visual elements
- Lifecycle management
Push Notifications
Apple Push
Notification Service
Third
Party
Server

7. Model View Controller (MVC)
MVCControlle
r
View
Model
Notify
Update
Update
User Action

8. • Always try to use higher level APIs
• View Controller - about 130 lines
• View should not store model data
• Use US English - Apple API
• Follow camelCase naming convention
Design Guide &
Best Practices

10. THANK YOU