Good news, most users of iOS devices do not need to worry about their iPhone or iPad getting a virus. Due to Apple’s tight stringent ecosystem, it is almost impossible for programs and scripts to execute on iOS unless they have been approved to work by Apple themselves.
Any apps created for the iPhone and iPad first have to go through Apple’s approval process, and they thoroughly check and ensure nothing malicious is occurring in apps.
The only real risk to iPhones and iPads is if the device is Jailbroken. By jailbreaking an iOS device, a user is injecting code that circumvents the need for apps to be installed through the iOS App Store. Thus apps from any source can be installed, and thus there is a risk of viruses.
The TotalAV iOS app, therefore, does not run Antivirus, as it does not need to. It instead provides a handful of tools that help in maintaining the health of your iPhone or iPad.