Advanced Development 0_basic development knowledge

Source: Internet
Author: User

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

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