IOS is a mobile operating system developed by Apple.
It was used in iPhone,iPod Touch and Apple TV in 2007.
IOS evolved from OSX and shares Darwin with OSX.
IOS is a mobile operating system that OSX uses in Apple’s operating system. 本教程适用于使用 Objective C 或 Swift 语言了解的开发人员，并用该语言开发 iPhone 和 iPad 应用。 This tutorial will enable you to fully understand the application and development of iPad and iPhone, and improve your professional knowledge level. Before continuing this tutorial, you should have a basic understanding of computer programming terminology. 你需要对 Objective-C 或 Swift 编程语言有一定的了解,这将帮助你更好的理解 iOS 编程的概念，并能更快的学习编程。 9.1.1. Applicable group ¶
9.1.2. The knowledge you need to have before taking this tutorial ¶