The operation is as follows:
1. Click Settings
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2. Click General;
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3. click about this machine
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4. You can query the version number
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iOS
iOS is a mobile operating system developed by Apple. Apple first announced this system at the Macworld conference on January 9, 27. It was originally designed for iPhone, and later it was applied to products such as iPodtouch, iPad and AppleTV. IOS, like Apple's MacOSX, is a Unix-like commercial operating system. Originally, this system was called iPhoneOS. Because iPad, iPhone and iPodtouch all use iPhoneOS, it was announced at the WWDC conference in 21 that it was renamed as iOS(iOS is a registered trademark of Cisco's network equipment operating system in the United States, and Apple's renaming has been authorized by Cisco).