Admob (6.12.x) symbol undefined error resolution (IOS)

When upgrading the SDK version of AdMob to 6.12.x,

Follow the official documentation (https://developers.google.com/mobile-ads-sdk/docs/#ios),

Add the following framework:

StorekitAudiotoolboxMessageuisystemconfigurationCoregraphicsAdsupport

after add-OBJC to other Linker Flags in the app target build settings.

Compile, the following link error will still appear.

Undefinedsymbols forArchitecture ARMv7:  "_objc_class_$_ekevent",referenced from:OBJC-class-ref inchlibgoogleadmobads.a(Gadopener.o)  "_objc_class_$_ekeventeditviewcontroller",referenced from:OBJC-class-ref inchlibgoogleadmobads.a(Gadopener.o)LD:symbol(s)  notfound forArchitecture Armv7clang:Error:linker command failed with ExitCode1 ( Use -v to see invocation)

here's how to fix it:add eventkit.framework and eventkitui.framework to the project.
To Add a method: Click Project Properties at the top of file browsing . Open the General tab, Locate the Link framework and Libraries under the label . using the displayed + button to add the above two frames.

Admob (6.12.x) symbol undefined error resolution (IOS)