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1. Removing clang warnings

   Remove the performSelector may cause a leak because its selector is unknown warning:

   #pragma clang diagnostic push
   #pragma clang diagnostic ignored "-Warc-performSelector-leaks"
   [self performSelector:@selector(xxx)];
   #pragma clang diagnostic pop
   

   Remove the "Undeclared selector" warning:

   #pragma clang diagnostic push
   #pragma clang diagnostic ignored "-Wundeclared-selector"
   [self performSelector:@selector(xxx)];
   #pragma clang diagnostic pop