"_iconv", "_iconv_open", "_iconv_close",这种错误的解决办法

Undefined symbols for architecture armv7:

  "_iconv", referenced from:

      _avcodec_decode_subtitle2 in libavcodec.a(utils.o)

  "_iconv_open", referenced from:

      _avcodec_open2 in libavcodec.a(utils.o)

      _avcodec_decode_subtitle2 in libavcodec.a(utils.o)

  "_iconv_close", referenced from:

      _avcodec_open2 in libavcodec.a(utils.o)

      _avcodec_decode_subtitle2 in libavcodec.a(utils.o)

ld: symbol(s) not found for architecture armv7

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

这些错误不是配置不正确，而是需要增加libiconv.dylib这个库，
把coreVideo.FrameWork和CoreMedia.FrameWork
这两个框架导进去之后就可以正常编译运行了