I wonder if the new Mac Catalyst might make it relatively easy to get the iOS iFly app to run on Mac computers. Here's Apple's description of it:
"Experience your favorite iPad apps now on your Mac. With Mac Catalyst, developers can easily create Mac apps from the iPad apps you already know and love. They run natively alongside your existing Mac apps so you can drag and drop content between them. They take full advantage of the larger screen and powerful architecture of your Mac. And because they are built from their iOS versions, they provide a seamless experience across your devices. Enjoy a broad range of Mac apps — from travel, entertainment, and gaming to banking, education, and project management."
Here's a lot more info on the Apple website: https://developer.apple.com/design/hu...w/mac-catalyst/
And here's how to make a Mac version of an app: https://developer.apple.com/documenta...f_your_ipad_app