// MLLTapGestureRecognizer.h

@interface MYTapGestureRecognizer : UITapGestureRecognizer

@property (nonatomic, copy) NSString *userId;

@end

// MLLTapGestureRecognizer.m

@implementation MYTapGestureRecognizer

@end

// =====================

....

MYTapGestureRecognizer *singleTap = [[MYTapGestureRecognizer alloc] initWithTarget:self action:@selector(tapDetected:)];

singleTap.userId = @"7a2h8hd8ff7f7fyv7fhf7v7fhf";

.....

// ====================

-(void)tapDetected:(UITapGestureRecognizer *)tapRecognizer {

MYTapGestureRecognizer *tap = (MYTapGestureRecognizer *)tapRecognizer;

NSLog(@"data : %@", tap.userId);

}