iOS13 "__OBJC_PROTOCOL_$_TXVideoPreviewListener", referenced from:

升级到xcode11之后，我再运行项目发现报错了，报错如下：

Undefined symbols for architecture x86_64:

  "__OBJC_PROTOCOL_$_TXVideoPreviewListener", referenced from:

      l_OBJC_CLASS_PROTOCOLS_$_TCVideoPreview in TCVideoPreview.o

ld: symbol(s) not found for architecture x86_64

clang: error: linker command failed with exit code 1 (use -v to see invocation)

根据这个报错信息，进入到TCVideoPreview.h里面，发现有个黄色的警告：Cannot find protocol definition for 'TXVideoPreviewListener'

我试着把 #import <TXVideoEditerListener.h>头文件引入，再运行结果就编译成功了。