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导入HelpDeskUI文件使用HDMessageViewController提示错误

导入HelpDeskUI文件使用HDMessageViewController提示错误:
Undefined symbols for architecture x86_64:

  "_OBJC_CLASS_$_HDMessageViewController", 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)。
 
已经设置过 -ObjC.
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