Hey there,
So yes, this is the same issue with phonegap since it uses cordova underneath as well.
In order for cordova to make a ios project, it needs the ios sdk, which is only available for osx.
Not our rule, but apples 
Options like building a hackinstosh are always available are have a good community around them.
Other options would be to buy a inexpensive mac mini, which are around $500 and are worth their price.