Develop iPhone Apps With iOs System Architecture

iOS SDK is a software development kit that was released on 6th March 2008 by Apple Inc. iOS system architecture is divided into four distinct layers, Cocoa Touch layer, Media layer, Core services layer and Core OS layer.

iOS SDK is meant to build apps for iOS. SDK is a key factor to become a successful iPhone game developer or to develop native apps for iPhone. The iOS SDK includes the software development tools and knowledge-base resources which allow apps developers to design and develop the game, install it on iPhone simulator and then run and test the iPhone applications before uploading it on Apple's App store. iOS applications are developed with the help of two major concepts. The first is an objective C and the second is an iOS system framework. iOS also has many sub frameworks. The two major high level frameworks are UlKit and Map Kit framework and others are accelerating and Core Location frameworks which support the hardware.

The native iOS application is one type of web application which runs on iOS devices as well as on the Safari web browser. These applications are developed with the help of Cocoa which can be composed of many objects that are received from NSObject and using objective C runtime programming language. The native iOS applications are able to interact directly with the iOS operating system and iOS system frameworks. When we build native application for any standard operating system then we don't have to worry about future upgradation in hardware devices and new component added on that hardware.

Of the four distinct layers the first two are higher level ones which are more object oriented layers. The last two layers are lower level ones and are mostly connected with the hardware part of the device. Both the layers have to rely on each other for better functionality and performance. The Cocoa Touch layer is one of the most important layers of an iOS system architecture and it includes UlKit framework which is widely used for performing multitasking, getting push notification, sensitive touch input and support the event driven iOS application. The same framework can also be used for OS X platform which is called Appkit framework.

Media layer helps to provide graphics, audio and video support for iOS applications. It uses Core Graphics, OpenGL ES, OpenAL, AV Foundation and Core Media technologies. The media layers also include a large number of frameworks to perform graphics and media related tasks. It has an asset library framework to operate photos and videos from iOS devices, core image framework to control the image indirectly through various filters and core graphics for making 2D image.

The core service layer is useful to perform necessary tasks of native iOS applications such as block the object class, iCloud storage, App purchase and central dispatch of apps. It has one most important component, ARC, which stands for Automatic Reference Counting and is useful to code for the audio, video and file system and memory management related tasks in objective C. Core services layers mostly depend on the foundation framework which act as a mediator between other layers to share code and data between libraries and frameworks. Core OS layer mostly supports the security features and interface with UNIX and carnel environment. With this Core OS layer your iOS application has no direct access.