iOS Architecture

# Four Abstract Layers of iOS

□ Core OS: Security Services, Core Bluetooth, External Accessory, Local Athentication, Accelerate

□ Core Services: Core Foundation/Data/Location & Webkit, CFNetwork

□ Media: Core-Graphic/Animation/Media & OpenGL/AL, AVFoundation

□ Cocoa Touch: UIKit, MessageUI, MapKit, PushKit, EventKitUI

* Security Model/Layer [Hardware--Core OS]

- Boot Chain Mechanism (Verify Certificate/Signature at each stage & Encrypt) [Device → iOS Kernel]

- Sandbox (In Kernal, Access Control Technique) <System -- User Data Protection> & Code-Signing

# iOS App/Scene Life Cycle

- Not running

- Inactive

- Active

- Runs in the foreground & receives events

- Background

- Exists in memory in background state, but does not execute code

- Execute code without user interaction

- Suspended

# Code Examples

To be continuted.. with MVVM & Clean Architecture

[References]

Overall Process (0)	2024.05.07

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