The first problem with google SDK was the xcode did not see the module.
The working answer was:
try doing the following steps:
- Put the path of
GoogleMobileAds.frameworkin Targets -> Build Settings “Framework Search Path”
- Set “No” under Project -> Build Settings -> Enable Bitcode
from here: https://stackoverflow.com/questions/39347291/import-googlemobileads-no-such-module-googlemobileads/39347372