Before you can start developing your iOS projects using Unreal Engine 4 you will need to download and install the following programs on your development PC.
Steps
When using Windows, you must have iTunes installed to package and deploy your iOS projects to your iOS device. You can download iTunes from the Apple website using the following link:
Once iTunes has completed downloading, make sure to install it on your development PC.
You must have the latest version of Xcode installed to package and deploy your iOS projects to your device on Mac OS. You can download the installer for Xcode from Apple using the following link:
Install Xcode
Once Xcode has finished downloading, make sure to install and then run it.
End Result
When completed you will now have iTunes installed and be able to deploy UE4 projects to your iOS devices.
When completed you will now have XCode installed and be able to deploy UE4 projects to your iOS devices.