Label size and Design for printers

We are building an IOS app with a web backend ( .net) and I can not find any info on how to give our users the ability to design their zebra labels within our app. In a perfect world I would love for the user to be able to chose their design style and label size right on the iPad then proceed with printing.  I am aware of Zebra Designer Pro ( for windows only) not sure how this would help me with IOS. Any direction would be great.