A brief introduction to OBJECTIVE-C learning 05-foundation framework

the so-called framework in iOS, after all, is a directory, and iOS provides a lot of frameworks that we can call in the application. Many applications use frameworks such as foundation, Uikit, and core graphics. Depending on the template you choose for your application, the relevant framework has been introduced automatically. For example, when we create a Xcode project under OSX application, the system will help us introduce the Foundation framework by default: #import <Foundation/Foundation.h> If the default framework does not meet the needs of your application, you can also join the framework you need. to use a framework, you need to add it to the project you created so that your project can use it. when we develop iOS projects, the primary framework used is the foundation and Uikit Framework, which provides the underlying system services for all applications, and the Uikit framework provides a class based on the user interface.

iOS Common base Framework

Frame name	Function
Foundation	Provides basic classes of OC (like nsobject,nsstring, etc.), basic data types, etc.
UIKit	Creating and managing the user interface for an application
Quartzcore	Provides animation effects and the ability to render through hardware
Coregraphics	Provides a C-based API for 2D drawing
SystemConfiguration	Detects if the current network is available and hardware device status
Avfoundation	Provides the underlying API for audio recording and playback, as well as managing audio hardware
Cfnetwork	Access and configure networks, like HTTP, FTP, and Bonjour Services
Corefoundation	Provides abstract common data types such as Unicode strings, XML, URLs, etc.
Corelocation	Get location information using GPS and WiFi

Gamekit	Network functions for games: Peer-to-peer and in-game voice communication
AddressBook	Provides the ability to access user contact information
Addressbookui	Provides a user interface for displaying contact information stored in the Address Book
Audiotoolbox	Provides the underlying API for audio recording and playback, as well as managing audio hardware
AudioUnit	Provides an interface that allows our applications to process audio
Mapkit	An interface that provides an inline map for an application
MediaPlayer	Provides the ability to play video and audio
Messageui	Provides a view control interface to handle e-mail and SMS
Opengles	Provides animation effects and the ability to render through hardware
Storekit	Provides support for applications to consume in the run of programs

and commonly used third-party open source framework afnetworking and so on.

Foundation framework

(The frame on the left is part of the official Apple document, and the right side shows the header file for the class under the foundation framework)

The so-called foundation.framework framework is that Apple encapsulates some of our commonly used classes into this framework, and the common classes are mainly Nsstring,nsdate,nsarray,nsdictionary,nsset, NSNumber, classes in OC can be classified as immutable (immutable) classes and variable (mutable) classes, and instance objects of immutable classes are called immutable objects. An object that cannot be changed after it is created. An instance object of a mutable class is called a Mutable object, which is an object that can change its contents or state after it is created. Using Foundation we can:

• Create and manage collections, such as arrays and dictionaries
• Access to images and other resources stored in the application
• Creating and managing strings
• Submit and receive notifications
• Create date and Time objects
• Automatically discover devices on an IP network
• Action URL Flow
• Execute asynchronous code

　　Well, to learn good systems to provide good classes we can:

1. Learn to use Apple's official API (Application Programming Interface, Application programming Interface) documentation

2. Directly view the header file of the class

Option + left mouse button to enter the API documentation for the Class (beginner)

Command + Left key into the class header file by looking at the way the file, suitable for this class have a certain understanding of the classmate.

3. When viewing API documentation, focus on which keywords

Inherits from which class to inherit from

Conforms to indicate which protocols this class follows

The framework of this class defines the

Availability This class supports this class from which version of iOS

Declared in declaration

A brief introduction to OBJECTIVE-C learning 05-foundation framework