How to compile in visual studio for iOS

Hello everyone. I can’t package my game for iOS platform. I’ve downloaded unreal engine 4.12 source code from git hub and I think iOS package fails because I haven’t compiled for iOS platform in visual studio. I’m not sure what I have to choose for solution configuration and solution platform(for example development | android) to compile for iOS. Pls help me if you know.

You should choose Mac OS computer.