Using this code you can play one of the more common system sounds:
let systemSoundID: SystemSoundID = 1003
AudioServicesPlaySystemSound(systemSoundID)
However, there are a lot of great sounds for your UI built into IOS that you find on these kind of paths:
/System/Library/Audio/UISounds/nano/Detent_Haptic.caf
So, how do you go about finding the ID of these sounds?