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Tip: Develop For iOS and OS X Without Buying A Mac

Hi, besides certain features in UE4 which do not require a Mac, you can also check out services such as:

http://www.macincloud.com/
http://xcloud.me/

Disclaimer: I have not tried them nor vouch for their suitability for your needs.

But, it may be something to consider as opposed to having to buy a new Mac.

All the best.