showInterstitial() iOS

- ( BOOL ) showInterstitials {
    if ( [ AdColonyAdministratorPublic videoAdCurrentlyRunning ] == NO ) {
    // 1. AdColony
        if ( [ self playAdColonyVideoForSlot: ADCOLONY_FULL_SLOT ] == ADCOLONY_DID_PLAY ) {
            return YES;
        }

    // 2. Greystripe
    else if ( [ _gsInterstitial isAdReady ] ) {
            [ _gsInterstitial displayFromViewController: _mainAdViewController ];
            return YES;
        }

    // 3. Millennial Media
    else if ( [ _mmAdView showInterstitial ] ) {
            [ _mmAdView fetchInterstitial ];
            return YES;
        }

    // 4. MoPub
    else if ( [ _mpInterstitialAdController ready ] ) {
            [ _mpInterstitialAdController showFromViewController: _mainAdViewController ];
            return YES;
        }

    // No available ads
    else {
            return NO;
        }
    } else {
        return NO;
    }
}