How can I get/set iOS Alarms?

I’m wanting to develop a proof of concept alarm clock within Unity and would like to be able to set the native Alarm Clock within iOS, how can I do this?

There’s an app here which appears to do this, how can I access native iOS features via Unity like this?

Just use the Apple iOS SDK from Objective-C. In Unity hook up the Objective-C code to your Unity game script as shown here.