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iOS Development指的是iOS开发。
iOS Distribution指的是iOS分布。
详细解释：
development 英[dɪˈveləpmənt] 美[dɪˈvɛləpmənt]
n. 发展，进化; 被发展的状态; 新生事物，新产品; 开发区;
[例句]Education is central to a country's economic development.
教育对一个国家的经济发展至关重要。
distribution
英[ˌdɪstrɪˈbju:ʃn] 美[ˌdɪstrəˈbjuʃən]
n. 分配，分布; [法] （无遗嘱死亡者的） 财产分配; [无线] 频率分布; [电] 配电;
[例句]He admitted there had been distribution problems.
他承认曾出现过配给问题。
iOS是由苹果公司开发的移动操作系统 。苹果公司最早于2007年1月9日的Macworld大会上公布这个系统，最初是设计给iPhone使用的，后来陆续套用到iPod touch、iPad以及Apple TV等产品上。iOS与苹果的Mac OS X操作系统一样，属于类Unix的商业操作系统。
iOS (originally iPhone OS) is a mobile operating system created and developed by Apple Inc. and distributed exclusively for Apple hardware. It is the operating system that presently powers many of the company's mobile devices, including the iPhone, iPad, and iPod touch.
Originally unveiled in 2007 for the iPhone, it has been extended to support other Apple devices such as theiPod Touch (September 2007), iPad (January 2010), iPad Mini (November 2012) and second-generation Apple TVonward (September 2010). As of January 2015, Apple's App Store contained more than 1.4 million iOS applications, 725,000 of which are native for iPad.
These mobile apps have collectively been downloaded more than 75 billion times.[9] It had a 21% share of the smartphone mobile operating system units shipped in the fourth quarter of 2012, behind Google's Android.[10] By the middle of 2012, there were 410 million devices activated.[11] At WWDC 2014, Tim Cook said 800 million devices had been sold by June 2014.[12] During Apple's quarterly earnings call in January 27, 2015, Apple announced that they have now sold one billion iOS devices.
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. Interaction with the OS includes gestures such as swipe, tap, pinch, and reverse pinch, all of which have specific definitions within the context of the iOS operating system and its multi-touch interface. Internal accelerometers are used by some applications to respond to shaking the device (one common result is the undo command) or rotating it inthree dimensions (one common result is switching from portrait to landscape mode).
iOS shares with OS X some frameworks such as Core Foundation and Foundation; however, its UI toolkit isCocoa Touch rather than OS X's Cocoa, so that it provides the UIKit framework rather than the AppKitframework. It is therefore not compatible with OS X for applications. Also while iOS also shares the Darwinfoundation with OS X, Unix-like shell access is not available for users and restricted for apps, making iOS not fully Unix-compatible either.
Major versions of iOS are released annually. The current release, iOS 8.3, was released on April 8, 2015. In iOS, there are four abstraction layers: the Core OS layer, the Core Services layer, the Media layer, and the Cocoa Touch layer. The current version of the operating system (iOS 8.0), dedicates 1.3 - 1.5GB of the device's flash memory for the system partition, using roughly 800 MB of that partition (varying by model) for iOS itself.[14][15] It runs on the iPhone 4S and later, iPad 2 and later, all models of the iPad Mini, and the 5th-generation iPod Touch.
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iOS是由苹果公司开发的手持设备操作系统。苹果公司最早于2007年1月9日的Macworld大会上公布这个系统，最初是设计给iPhone使用的，后来陆续套用到iPod touch、iPad以及Apple TV等苹果产品上。iOS与苹果的Mac OS X操作系统一样，它也是以Darwin为基础的，因此同样属于类Unix的商业操作系统。原本这个系统名为iPhone OS，直到2010年6月7日WWDC大会上宣布改名为iOS。外文名：iOS开发商：苹果公司发行商：苹果公司发行时间：2007年6月29日（初版）编程语言：C语言，C++， Objective-C源码模式：混合（封闭源码，开源组件）内核：Darwin授权条款：EULA