Thank you.
Finally, I solved this problem.
For those who read this post later, I wrote below how to import admob with sdkbox into a project made with cocos2d-x v4.
After installing cocos2d-x v4, create a project in any location.
cocos new CocosTest -l cpp -p com.mydomain.cocostest
Create an ios-build folder in the project folder and create an Xcode project file in it.
cd CocosTest
mkdir ios-build
cd ios-build
cmake .. -GXcode -DCMAKE_SYSTEM_NAME=iOS -DCMAKE_OSX_SYSROOT=iphoneos
Import admob with sdkbox.
cd CocosTest
sdkbox import admob
Open CMakeLists.txt and delete the following 3 lines.
set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} GoogleUtilities.xcframework")
set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} PromisesObjC.xcframework")
set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} nanopb.xcframework")
Run cmake …
cd ios-build
cmake ..
Open the Xcode project located in the ios-build folder.
Right-click in the left pane and create a new group named Frameworks
Drag GoogleUtilities.xcframework, nanopb.xcframework and PromisesObjC.xcframework in proj.ios_mac to Frameworks.
At that time, check the target of the project name.
Targets->Project Name->Frameworks, Libraries, Embedded Content
Press + button and add 3 xcframeworks.
Select Embed & Sign.
Targets->Project Name->Signing & Capabilities->All->Signing->Team
Select the appropriate team.
Targets->Project Name->Build Phases->Link Binary with Libraries
Make sure there are 3 xcframeworks you added.
Disclose Embed Frameworks and Enable “Copy only when installing”.
File->Project Setting->Build System
Change from “Legacy Build System” to “New Build System (Default)”.
Select the target of project name and run.
You build successfully.
