UITapGestureRecognizer *gest = [[UITapGestureRecognizer alloc]initWithTarget:self action:@selector(whenWTap:)];
gest.numberOfTapsRequired = 2;
[imgv addGestureRecognizer:gest];
[gest release];

-(void)whenWTap:(UITapGestureRecognizer*)gest{
    NSLog(@"WTap!");
}