Os of iPhone - iOS - Gets Split into Four Different LayersAn clear innovation in the industry of communication - iPhone - enjoys its special operating system which is called iOS. The os is actually separated into four layers in order that iPhone applications developers can take maximum advantage of the product. The layers are: Cocoa Touch Layer (upper layer), Media Layer, Core Services Layer and Core OS Layer (deepest layer). To get well-versed along with these layers is actually of vital importance for iPhone application developers. Let's have a cursory look at initial two layers.

The very first layer - Cocoa Touch - is also known as upper layer and is actually essential with regard to iPhone. This specific layer supplies essential frameworks that offer the infrastructure iPhone app developer needs to use on applications. One of the most utilized frameworks are UIKit framework, Foundation Framework, Core Foundation Framework and so on. During iPhone application development, iPhone application developers make use of UIKit to implement graphical user interface. The Foundation framework is used to communicate with the Core Foundation Framework within the lower Core Services Layer, which includes all the other available development features.

So as to add multimedia services in the application, Media layer can be used. Each of the graphics, audio as well as video technologies are found in this layer that motivate iPhone applications developers to construct ravishing applications. The Core Graphics framework offers the interfaces for the Quartz 2D drawing API. Quartz is the same advanced, vector-based drawing engine that is utilized in Mac OS X. It offers support for path-based drawing, anti-aliased rendering, gradients, images, colors, coordinate-space transformations, plus PDF document creation, display, and parsing. Inspite of the fact that the API is C based, it uses object-based abstractions. It is used to stand for fundamental drawing objects, which makes it easier to keep and reuse graphics content.

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The Quartz Core framework is made up of the Core Animation interfaces which is an advanced animation and compositing technology that uses an enhanced rendering path to use difficult animations and visual effects. It comes with a high-level, Objective-C interface for configuring animations and effects which are then rendered in hardware for functionality. Core Animation is integrated into many portions of iPhone Operating system, such as UIKit classes like UIView, giving animations for numerous standard system behaviors.

To make custom animations, the corporations providing iPhone apps development India utilize the Objective-C interface in this framework. The audio technologies accessible in iPhone Operating system are created to assist iPhone application developer hand out excellent audio experience to the users. The technologies enable developers construct applications that can play back or record high-quality audio and generate the vibration feature on devices that support those functionalities. The audio technologies enable audio formats such as AAC, Apple Lossless (ALAC), a-law, HE-ACC (MPEG-4 High Efficiency ACC), iLBC(Internet Low Bitrate Codec), MP3(MPEG-1 audio layer 3), IMA/ADPCM (IMA4), Linear PCM.

By using Media Player framework, iPhone Operating system provides full-screen video playback. With this framework, one may playback movie files using the .mov, .mp4, .m4v, and .3gp filename extensions. Below compression standards are utilized to enable playback of movie files:

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H.264 Baseline Profile Level 3.0 video, up to 640 x 480 at 30 fps. Remember that B frames aren't supported inside the Baseline profile

MPEG-4 Part 2 video (Simple Profile)

AAC-LC audio, up to 48 kHz

Lots of audio formats, for example the ones shown in ''Audio Technologies''

The developers who're well-versed with these four layers, their significance in the entire development process, iPhone application development is actually a distinctive creative experience.