Undefined symbols for architectu

Undefined symbols for architecture x86_64:
  "_NTESNotificationLogout", referenced from:
      ___56-[SettingViewController alertView:clickedButtonAtIndex:]_block_invoke in SettingViewController.o
ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)


1.
__class 为框架丢失   加入缺失的框架 或者.m文件

2.
在clickedButtonAtIndex这个方法里，找不到_NTESNotificationLogout

错误原因: 自己定义了一个空的字符串NTESNotificationLogout  传给方法里面的一个系统通知的postname

E50F7FCFE7E458BC6216A5CB718E0716.png