You must have a Mac paired with Windows to use iOS Designer.
Xamarin.iOS requirements:
A Windows computer must have access to a Mac through a network.
Xamarin.iOS for Visual Studio performs an amazing feat: it allows you to create, create and debug iOS applications on a Windows computer using the Visual Studio development environment. He cannot do this alone - iOS applications cannot be created without the Apple compiler, and they cannot be deployed without Apple certificates and code signing tools. This means that to complete these tasks, your installation of Xamarin.iOS for Visual Studio requires a connection to a Mac OS X network computer. After configuration, the Xamarins tools will make the process as seamless as possible.
Link: https://developer.xamarin.com/guides/ios/getting_started/installation/windows/#System_Requirement
Sushihangover
source share