Hi, I just read your project, i can do it for sure but not in objective-c. I can do it in JAVA or ElectronJS two techologies that are fully cross platform. That means the application i will develop for you will not work only on MAC, but it will work in MAC, LINUX and WINDOWS. I can do all of this in three days at most. IF all this suits you, please contact me over chat so we can discuss about details. Thank you.