[__NSCFNumber length]: unrecognized selector sent to instance - iphone

Question

I am trying to pass data from a table view controller to a detail view controller. Every entry of my table works just as it should, except for one.
Here is the prepareForSegue method:
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender{
if ([[segue identifier] isEqualToString:#"showDetails"]) {
NSIndexPath *indexPath = [[self tableView] indexPathForSelectedRow];
NSDictionary *notification = [[self notifications] objectAtIndex:[indexPath row]];
NRDetailViewController *destViewController = [segue destinationViewController];
[destViewController setDate:[notification objectForKey:#"date"]];
[destViewController setFrom:[notification objectForKey:#"from"]];
[destViewController setIden:[notification objectForKey:#"identifier"]];
[destViewController setPriority:[notification objectForKey:#"priority"]];
[destViewController setSubject:[notification objectForKey:#"subject"]];
[destViewController setMessage:[notification objectForKey:#"text"]];
}
}
Here is my interface for the detail view:
#import <UIKit/UIKit.h>
#interface NRDetailViewController : UIViewController
#property (weak, nonatomic) IBOutlet UITextField *dateField;
#property (weak, nonatomic) IBOutlet UITextField *fromField;
#property (weak, nonatomic) IBOutlet UITextField *idenField;
#property (weak, nonatomic) IBOutlet UITextField *prioField;
#property (weak, nonatomic) IBOutlet UITextField *subjectField;
#property (weak, nonatomic) IBOutlet UITextView *messageView;
#property (copy, nonatomic) NSString *date;
#property (copy, nonatomic) NSString *from;
#property (copy, nonatomic) NSString *iden;
#property (copy, nonatomic) NSString *priority;
#property (copy, nonatomic) NSString *subject;
#property (copy, nonatomic) NSString *message;
#end
Here is the detail view's implementation file:
#import "NRDetailViewController.h"
#interface NRDetailViewController ()
#end
#implementation NRDetailViewController
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
if (self) {
// Custom initialization
}
return self;
}
- (void)viewDidLoad
{
[super viewDidLoad];
[[self dateField] setText:[self date]];
[[self fromField] setText:[self from]];
[[self idenField] setText:[self iden]];
[[self prioField] setText:[self priority]];
[[self subjectField] setText:[self subject]];
[[self messageView] setText:[self message]];
}
- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
#end
I have problem setting the text of idenField to the text of iden. I have added an exception breakpoint, and got that the exception indeed occurs at this line:
[[self idenField] setText:[self iden]];
At this point, I have printed the value of [self iden] and it even contains the content I want to pass, so I have absolutely no idea what the problem is, since as I said, all the other fields are working as they should.
The exception being thrown is:
2013-08-07 22:28:20.539 NotificationReader[1214:11303] -[__NSCFNumber length]: unrecognized selector sent to instance 0x7587a00
Any help would be appreciated greatly.

Answer 1

It looks like:
[destViewController setIden:[notification objectForKey:#"identifier"]];
is returning an NSNumber and not an NSString. You could try replacing that line with:
[destViewController setIden:[(NSNumber*)[notification objectForKey:#"identifier"] stringValue]];

Answer 2

Somewhere you are passing an NSNumber instead of a NSString.

Answer 3

To set the text, iden needs to be a NSString. When you are getting the object from the NSDictionary, it is a NSNumber.
Try this:
[destViewController setIden:(NSString *)[notification objectForKey:#"identifier"]];
or change the iden property to be a NSNumber and then
[[self idenField] setText:[NSString stringWithFormat:#"%d", [self iden]]];