Property not found on ViewController - iphone

Question

I am beginning in iOS development. I've been searching a solution for days and I can't get it. I got the following code:
#interface SAProfileViewController : UITableViewController {
#public NSNumber *userId;
}
#property (weak, nonatomic) IBOutlet UIView *awesomeProfileHeader;
#property (nonatomic, assign) NSNumber *userId;
#end
As you can see I am declaring my property, and after that I do this :
#implementation SAProfileViewController
#synthesize userId = _userId;
...
On an other ViewController I import SAProfileViewController.
#import "SAProfileViewController.h"
...
-(void)goToUserProfile :(id) sender
{
UITapGestureRecognizer *gesture = (UITapGestureRecognizer *) sender;
SAProfileViewController *controller = [[SAProfileViewController alloc] init];
controller.userId = gesture.view.tag; // << HERE THE ERROR APPEARS
[self.navigationController pushViewController:controller animated:YES];
}
That's it, this is my code and I get the following error:
"Property 'userId' not found on object of type 'SAProfileViewController *'
Thanks in advance.

Answer 1

You have done a mistake with the property type.
Change
#property (nonatomic, assign) NSNumber *userId;
to
#property (nonatomic, retain) NSNumber *userId;
Than you have to create a NSNumber instance of gesture.view.tag like this
controller.userId = [NSNumber numberWithInteger:gesture.view.tag];
OR you can change your userId to NSInteger instead of NSNumber*
#property (nonatomic, assign) NSInteger userId;
(you have to do this for the object attribute userId, too)