The development history of iOS system： one is called iOS and the other is called other OS.

　　　　Yesterday morning, Apple pushed the official version of iOS 9 system to users around the world, and many users who had been waiting for it for a long time upgraded at the first time. So far, the iOS operating system has gone through eight years from 2007 to now. During these years, a little bit of functions have been added, optimized and evolved, thus becoming what we see today. People may still be impressed by the flat design of iOS 7, but it may be difficult to remember the whole development history. Today, when we look back at the evolutionary history of the iOS operating system, we can see how it developed from obscurity to blockbuster.

History of development: one is called iOS and the other is called other OS.

iOS　1

The classic iOS interface represents an era.

　　　　With the advent of the first generation, Apple demonstrated the world’s first mature touch-optimized mobile operating system. The main user interface of iOS 1.0 has become the main symbol of iOS, and the rounded square application icon and the four fixed applications at the bottom of the interface are classics, which have become imitations of many software manufacturers.

The birth of iPhone also means the birth of touch-optimized mobile operating system.

　　　　The first generation of iOS operating system already has the functions of multi-touch gestures, virtual voice mail, browsing on the mobile network, watching Youtube videos and so on. In addition to the home screen, most of the interface and design elements in iOS 1.0 have been used to this day, including, call interface, Google Maps, mobile Safari and "visual voice mail".

　　　　However, the original system still has various problems, such as unable to send multimedia messages, unable to copy and paste and unable to delete contacts in batches. Strictly speaking, it cannot be called a good operating system, but this does not prevent iOS 1.0 from becoming a great operating system.

iOS　2

With that arrival of iPhone 3G, iOS 2.0

　　　　Apple’s second-generation iPhone(iPhone 3G) was launched in July 2008, and it installed the iOS 2.0 operating system. In addition, the first generation of Apple users can upgrade their systems to iOS 2.0. At the same time, Apple also launched the App Store at this time, which means that users can use third-party applications. At that time, this system was very popular.

　　　　Of course, iOS 2.0 system has also added many other new functions, such as independent contact application (the previous generation contact application was designed in dial-up application), global search function and scientific calculator with richer functions, and users can also solve some more complicated problems through iOS 2.0 system.　

iOS　3

IOS 3.0 brings a lot of functions to iPhone users.

　　　　IOS 3.0 operating system was released together with iPhone 3GS on June 8, 2009, and was released as iPhone 3GS on June 19, 2009. The new features of this software include: Apple users can copy and paste text for the first time, and can send information with landscape keyboard. To our surprise, compared with videos, many users still like to send text messages today. In fact, in the first two generations of systems, after people used to the mature Saipan system, there were still many differences or inconveniences in the iPhone OS system, although at that time people thought that the iPhone provided a novel experience.

　　　　However, after filling in some missing functions in version 3.0, the practicability of iPhone has been greatly enhanced. Then, in April 2010, Apple released iOS 3.2. IOS 3.2 is an epoch-making evolution, because it is the first mobile system optimized for the "big screen" iPad tablet.