String value encountered a warning message, record it

Sending 'const NSString *__strong' to parameter of type 'NSString *' discards qualifiers

The code is written like this

UIKIT_EXTERN const NSString * kNetworkType;

This warning will be issued when using it, and it will be changed to:

UIKIT_EXTERN NSString * const kNetworkType;

If const is placed after nsstring *, there will be no warning.