Undefined symbol: _OBJC_CLASS_$_CTTelephonyNetworkInfo

Xcode 报错：Undefined symbols for architecture x86_64:

  "_OBJC_CLASS_$_CTTelephonyNetworkInfo", referenced from:

      objc-class-ref in libWeiboSDK.a(WBSDKPhoneCountryView.o)

      objc-class-ref in libWeChatSDK.a(MTAHelper.o)

ld: symbol(s) not found for architecture x86_64

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

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Undefined symbol: _OBJC_CLASS_$_CTTelephonyNetworkInfo

错误图示如下：

报错图示

这时候只需要选中工程项目，点击General，找到 Frameworks,Libraries,and Embeded Content ,点击下方加号，把CoreTelephony.framework添加进去就行了。运行发现报错消失了。