Click on UITextView or UITextField to crash

*** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[__NSCFString timeIntervalSinceReferenceDate]: unrecognized selector sent to instance 0x115fadbc0'
*** First throw call stack:
(0x1940bd8c8 0x1910097c4 0x194159838 0x19403a4f8 0x1940423a0 0x1e42cb9a8 0x1e42ce220 0x106f02c08 0x1080a461c 0x1080be2b0 0x1080acb2c 0x1080ad7b4 0x1080b9b00 0x1080b91a4 0x1eecdb3b8 0x1eecda8c0)
libc++abi: terminating due to uncaught exception of type NSException

InputAnalytics called timeIntervalSinceReferenceDate in dispatch_sync.The display issue of the call stack occurs in two stages: keyboard input analysis and folding the keyboard. After adding protection to NSString, it can function normally, but I want to know the reason

#import "NSString+Safe.h"
@implementation NSString (Safe)
- (NSTimeInterval)timeIntervalSinceReferenceDate {
    return 0;
}
- (NSTimeInterval)timeIntervalSinceDate:(NSDate *)date {
    return 0;
}
@end