FIRApp.configure()
GADMobileAds.configure(withApplicationID: "MY_AD_ID")

func loadAd() {
    if !GADRewardBasedVideoAd.sharedInstance().isReady {
        let request = GADRequest()
        GADRewardBasedVideoAd.sharedInstance().load(request, withAdUnitID: "MY_AD_UNIT_ID")
    }
}

<Google> Cannot find an ad network adapter with the name(s): GADMAdapterVungleRewardBasedVideoAd. Remember to link all required ad network adapters and SDKs, and set -ObjC in the 'Other Linker Flags' setting of your build target.

<Google> Cannot find an ad network adapter with the name(s): GADMAdapterAdColony. Remember to link all required ad network adapters and SDKs, and set -ObjC in the 'Other Linker Flags' setting of your build target.