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:
• Multitasking
• Face time
• Folders
• 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 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.
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