AppDelegate update with Firebase

Question

I need to add the following code to my main AppDelegate, I have 2 files called AppDelegate, AppDelegate.m, AppDelegate.h, which one do I need to edit?

Neither file has @import they both have #import

@import UIKit;
@import Firebase;

@implementation AppDelegate

- (BOOL)application:(UIApplication *)application
    didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
  [FIRApp configure];
  return YES;
}

Answer 1

@import is available since iOS 7 and is an improvement on #import (see for example this blogpost for more info). You should be able to use @import Firebase;, but otherwise it'd be #import <Firebase/Firebase.h>