Mr. Arvind Kumar
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iOS is Apple's mobile operating system developed originally for the iPhone, and later deployed on the iPod Touch and iPad as well. It is derived from Mac OS X, with which it shares the Darwin foundation, and is therefore a Unix-like operating system, by nature. In iOS, there are four abstraction layers: the Core OS layer, the Core Services layer, the Media layer, and the Cocoa Touch layer. The operating system uses roughly 500 megabytes of the device's storage.
Version 4, announced in April 2010, introduced multitasking as well as several business-oriented features, including encryption for email and attachments. At the WWDC 2010 keynote on June 7, 2010, Apple announced that iPhone OS had been renamed iOS. Apple licenses the trademark for "iOS" from Cisco Systems (who own IOS), the same company with which Apple had earlier settled a dispute over the "iPhone" trademark.
iOS 4 was released on June 21, 2010, three days before the iPhone 4. Staggering product launches reduces strain on Apple's servers. iOS 4 is the first version of the OS to be a free upgrade on the iPod touch; Apple had charged $9.99 for earlier upgrades. Apple previously announced that iPad users with 3.x software would receive a free upgrade to the next major (4.x) release.
New features of ios4 are:
• Face time
• Performance and stability
• Reception strength
iOS is Apple's mobile operating system. Developed originally for the iPhone, it has since been shipped on the iPod Touch and iPad as well. Apple does not permit the OS to run on third-party hardware. As of June 7, 2010, Apple's App Store contained more than 225,000 iOS applications, which had collectively been downloaded more than five billion times.
The user interface of iOS is based on the concept of direct manipulation, using multi-touch gestures. Interface control elements consist of sliders, switches, and buttons. The response to user input is immediate and provides a fluid interface. Interaction with the OS includes gestures such as swiping, tapping, pinching, and reverse pinching. Internal accelerometers are used by some applications to respond to shaking the device (one common result is the undo command) or rotating it in three dimensions (one common result is switching from portrait to landscape mode).
iOS is derived from Mac OS X, with which it shares the Darwin foundation, and is thereforea Unix-like operating system by nature.
In iOS, there are four abstraction layers: the Core OS layer, the Core Services layer, the Media layer, and the Cocoa Touch layer. The operating system uses roughly 500 megabytes of the device's storage.
OVERVIEW OF APPLE iOS
iOS comprises the operating system and technologies that you use to run applications natively on devices, such as iPad, iPhone, and iPod touch. Although it shares a common heritage and many underlying technologies with Mac OS X, iOS was designed to meet the needs of a mobile environment, where users’ needs are slightly different. If you have previously developed applications for Mac OS X, you will find many familiar technologies, but you’ll also find technologies that are available only on iOS, such as the Multi-Touch interface and accelerometer support.
The iPhone SDK contains the code, information, and tools you need to develop, test, run, debug, and tune applications for iOS. The Xcode tools provide the basic editing, compilation, and debugging environment for your code. Xcode also provides the launching point for testing your applications on an iOS device, and in iPhone Simulator—a platform that mimics the basic iOS environment but runs on your local Macintosh computer.
ORIGIN OF iPHONE
Comments made by Jobs in April 2003 at the "D: All Things Digital" executive conference expressed his belief that tablet PCs and traditional PDAs were not good choices as high-demand markets for Apple to enter, despite many requests made to him that Apple create another PDA.
He did believe that cell phones were going to become important devices for portable information access, and that what cell phones needed to have was excellent synchronization software.
At the time, instead of focusing on a follow-up to their Newton PDA, Jobs had Apple put its energies into the iPod, and the iTunes software (which can be used to synchronize content with iPod devices), released January 2001.
On September 7, 2005, Apple and Motorola released the ROKR E1, the first mobile phone to use iTunes. Jobs was unhappy with the ROKR, feeling that having to compromise with a non-Apple designer (Motorola) prevented Apple from designing the phone they wanted to make.
In September 2006, Apple discontinued support for the ROKR and released a version of iTunes that included references to an as-yet unknown mobile phone that could display pictures and video.
On January 9, 2007, Jobs announced the iPhone at the Macworld convention, receiving substantial media attention, and on June 11, 2007 announced at the Apple's Worldwide Developers Conference that the iPhone would support third-party applications using the Safari engine on the device.
Third-parties would create the Web 2.0 applications and users would access them via the internet.
Such applications appeared even before the release of the iPhone; the first being "OneTrip", a program meant to keep track of the user's shopping list.
On June 29, 2007, Apple released version 7.3 of iTunes to coincide with the release of the iPhone. This release contains support for iPhone service activation and syncing
HISTORY OF iOS:
The operating system was unveiled with the iPhone at the Macworld Conference & Expo on January 9, 2007, and released in June of that year. At first, Apple marketing literature did not specify its name, stating simply that the "iPhone uses OS X".
Initially, third-party applications were not supported. Steve Jobs argued that developers could build web applications that "would behave like native apps on the iPhone". On October 17, 2007, Apple announced that a native SDK was under development and that they planned to put it "in developers' hands in February". On March 6, 2008, Apple released the first beta, along with a new name for the operating system: iPhone OS.
Brisk sales of Apple mobile devices kindled interest in the SDK. The previous September, Apple had released the iPod Touch, which had most of the non-phone capabilities of the iPhone. Apple also sold more than one million iPhones during the 2007 holiday season. On January 27, 2010, Apple announced the iPad, featuring a larger screen than the iPhone and iPod Touch, and designed for web browsing, media consumption, and reading iBooks.
The home screen (rendered by "SpringBoard") with application icons, and a dock at the bottom of the screen where users can pin their most frequently used apps, is presented whenever the device is turned on or the home button pressed. The screen has a status bar across the top to display data, such as time, battery level, and signal strength. The rest of the screen is devoted to the current application. Double pressing the home button activates the application switcher. A scrollable dock-like interface appears from the bottom, moving the contents of the screen up. Choosing an icon switches to an application. To the far left are icons which function as music controls, and a rotation lock. Holding the icons makes them wiggle (similarly to the homescreen) and allows the user to quit the applications.