IOS, formerly known as iPhone OS, is a mobile operating system developed by Apple.
The first version of iOS was released in 2007, including iPhone and iPod Touch.
The iPad (first generation) was released on January 27th, and the iPad Mini was released in November 2012.
IOS devices are released quite frequently, and past experience shows that at least one version of iPhone and iPad is released every year.
Now iPhone6s has been released, and before that, iPhone,iPhone3gs,iPhone4,iPhone4s and iphone5, iPhone5s, iPhone6 have been launched.
The same iPad has been updated from the iPad generation to the fourth generation of iPad and a special mini version of iPad.
IOS SDK has been updated from 1.0 to 6.0. The latest iOS SDK6.0 is the only version that supports Xcode4.5 and its later versions.
丰富的苹果文档，使我们能找到许多方法和库用于我们的部署目标。在Xcode的当前版本中，我们能够在iOS4.3,5.0和6.0的部署目标之间选择。
The impact of iOS can be seen in the following characteristics:
Facebook and Twitter, accelerometers, GPS, high-end processors, cameras, Safari browsers, powerful API, game centers, in-app purchases, reminders, wide-range gestures
Map
Siri
Facebook and Twitter
Multi-Touch (multi-touch)
Accelerometer (accelerometer)
GPS
High performance processor
Camera
Safari browser
Powerful API
Game center
Purchase within the application
Reminder function
Gesture
The growing number of users of iPhone and iPad has created moneymaking opportunities for developers of iPhone and iPad app stores.
The latest thing about IOS is that Apple has developed an app store so that users can buy apps to improve their iOS devices.
Developers can release free and paid applications in the application mall.
To develop an application and publish it to the App Store, developers need to sign up for the iOS developer program and update Xcode for $99 a year and Mac Mountain Lion or more for their development. For users who own Apple devices, it is very necessary to have Apple ID, and to become a developer, they must use Apple ID. Access to Apple ID is free and there is no need to worry about fees. Having an Apple account has the following benefits: Easy to understand R & D tools Videoconference for global developers Be invited to join the iOS developer team 1、单击 ( https://developer.apple.com/programs/register/ ) 并选择创建Apple ID 2、输入个人信息 3、返回邮箱确认，激活账号 Download R & D tools, Xcode and its iOS simulator, iOS SDK and other R & D resources 1、点击 ( https://developer.apple.com/programs/ios/ ) 2、点击注册页面 3、登录账号（已有账号）或注册Apple ID 4、选择个人账号或公司账号，研发者团队使用公司账号，个人账号不能添加其他用户 5、新用户进入个人信息页面，使用信用卡购买加入研发项目 6、选择会员中心，利用研发者资源 7、在此处可以执行以下操作: Create a provisioned profile Manage teams and Devic Apply to applications through iTunes Connect management Get forums and technical support 9.2.1. Register an Apple developer ¶
9.2.2. Sign up for an Apple account ¶
9.2.3. Apply for APP developer ¶
