How to retrieve iPhone IDFA from API?

Question

I would like to get the device IDFA. How to get this info from iOS official API ?

Answer 1

Just to extend Amro's Swift answer, here's similar code wrapped in a method:

import AdSupport

...

func provideIdentifierForAdvertisingIfAvailable() -> String? {
    if ASIdentifierManager.sharedManager().advertisingTrackingEnabled {
      return ASIdentifierManager.sharedManager().advertisingIdentifier?.UUIDString ?? nil
    } else {
      return nil
    }
  }