I sold the code years ago, and transferred the app. On a whim I found it again.
It is still running 100% perfectly with no updates from the initial build.
(It literally cant be updated now, unless you are going to rewrite it from scratch)
I am just curious how this app can still be running perfectly after so much time.
It has ancient code with a completely out of date unusable IAP setup, yet it all still works on iOS 12 and the newest iPhones / iPads.
I'm not specialist of objC, so take this comment with caution.
AFAIK, ObjC binary interface (ABI) is stable from a long time, even though API has changed. That's why you could not recompile but still run executable.
Swift has been working to achieve ABI stability from a long time, targetting to get it with Swift 5.
Read here
https://stackoverflow.com/questions/11693436/objective-c-stable-abi
Thanks that was interesting and helpful. Learned something new.
