Undefined symbols for architecture armv7

The following error occurs during xcode Compilation:

Undefined symbols for architecture armv7:

"_ Objc_class _ $ _ calayer", referenced from:

Objc-class-ref in egorefreshtableheaderview. o

"_ Catransform3didentity", referenced from:

-[Egorefreshtableheaderview setstate:] In egorefreshtableheaderview. o

"_ Kcatransactiondisableactions", referenced from:

-[Egorefreshtableheaderview setstate:] In egorefreshtableheaderview. o

"_ Kcagravityresizeaspect", referenced from:

-[Egorefreshtableheaderview initwithframe:] In egorefreshtableheaderview. o

"_ Catransform3dmakerotation", referenced from:

-[Egorefreshtableheaderview setstate:] In egorefreshtableheaderview. o

"_ Objc_class _ $ _ catransaction", referenced from:

Objc-class-ref in egorefreshtableheaderview. o

Ld: symbol (s) not found for architecture armv7

Clang: Error: Linker command failed with exit code 1 (use-V to see Invocation)

In fact, your. Framework is not added.

The method or procedure for adding a dynamic library is as follows: targets ---> build phases -----> link binary with libraries -----> + select the library to be added.

For example, I only need quartzcore. framework.