i have a PC and i am previewing right now a game test on my ipod touch 4G<img src="smileys/smiley4.gif" border="0" align="middle" />
you need cocoonjs launcher you can find in the app store
and of course an ios device(ipod,ipad etc)
export your project and select cocoonjs in construct2 copy the zip file generated to your device
or uplod to the internet and copy the link to cocoonjs launcher.
and now you can preview your game on the device without the need of a mac
but you need a mac to send your app to the app store <img src="smileys/smiley12.gif" border="0" align="middle" />