我使用 pod 将 cocoalumberjack 安装到我的 macosx 项目中。这是错误消息的输出。
Undefined symbols for architecture x86_64:
"_OBJC_CLASS_$_DDLog", referenced from:
objc-class-ref in AppDelegate.o
ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)