[]编译的时候报错

Undefined symbols for architecture arm64:
  "_OBJC_CLASS_$_conchConfig", referenced from:
      objc-class-ref in GameReadingViewController.o
  "_OBJC_CLASS_$_conchRuntime", referenced from:
      objc-class-ref in GameReadingViewController.o
  "_OBJC_IVAR_$_conchRuntime.m_currentFrame", referenced from:
      -[GameReadingViewController viewDidLayoutSubviews] in GameReadingViewController.o
  "_OBJC_IVAR_$_conchConfig.m_nOrientationType", referenced from:
      -[GameReadingViewController supportedInterfaceOrientations] in GameReadingViewController.o
ld: symbol(s) not found for architecture arm64
clang: error: linker command failed with exit code 1 (use -v to see invocation)