Advanced Development 0_basic development knowledge

IOS system architecture The IOS system architecture is divided into four layers: 1. Core operations layer (core OS) 2. Core Services Layer (core services) 3. Media Layer) 4. Cocoa touch) Main functions of each layer (only available) 1. core operating system layer (core OS): it includes memory management, file system, power management, and some other operating system tasks. It can directly interact with hardware devices. 2. core services: we can use it to provide IOS services, such as network connection, file access, database, and user location. 3. Media: We can use various media files in an application to record audio and video, draw images, and create basic animation effects. 4. Cocoa touch: This layer provides a variety of 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. Cocoa touch The cocoa touch layer has a very important framework, uikit framework, which provides various visual components for the Program (blank view, view)

Button: uibutton switch: uiswitch progress bar: uiprogressview

Framework:

Framework name	Function
Foundation	Provides basic OC classes (nsobject) and basic data types.
Uikit	User Interface for creating and managing applications
Quartzcore	Provides animation effects and hardware rendering capabilities
CoreGraphics	Provides a C-based API for 2D rendering.
Systemconfiguration	Checks whether the current network is available and the status of hardware devices
Ayfoundation	Provides underlying APIs for audio recording and playback, and manages audio hardware.
Cfnetwork	Access and configure the network, and want HTTP, FTP, And bonjour services
Corefoundation	Provides abstract common data types, such as Unicode strings, XML, and URL.
Corelocation	Use GPS and WiFi to get location information
Gamekit	Provides network functions for games: point-to-point interconnection and voice communication in games
Addressbook	Provides the ability to access user contacts and information
Addressbookui	Provides a user interface to display the contact information stored in the address book.
Audiotoolbox	Provides underlying APIs for audio recording and playback, and manages audio hardware.
Audiounit	Provides an interface for our applications to Process audio.
Mapkit	Provides an embedded map interface for the reference program
Mediaplayer	Supports video and audio playback.
Messageui	Provides a view control interface to process e-mail and text messages.
Opengles	Provides animation effects and hardware rendering capabilities

Advanced Development 0_basic development knowledge