UINavigationController weird issue - iphone

Question

In my app I have NavigationController as root, I have a navigation button as well.
When I'm pressed the button it flips to another controller.
the destination view code:
- (void)viewDidLoad
{
[super viewDidLoad];
NSString *filePath = [[NSHomeDirectory() stringByAppendingPathComponent:#"Documents"]stringByAppendingPathComponent:#"favorites.plist"];
NSData *data = [[NSData alloc]initWithContentsOfFile:filePath];
NSKeyedUnarchiver *unArchiver = [[NSKeyedUnarchiver alloc]initForReadingWithData:data];
self.title = [unArchiver decodeObjectForKey:#"title"];
self.pubDate = [unArchiver decodeObjectForKey:#"pubdate"];
self.description = [ unArchiver decodeObjectForKey:#"description"];
}
Button code 1:
-(void)navFavoritesButton{
[UIView beginAnimations:#"flipview" context:nil];
[UIView setAnimationDuration:2];
[UIView setAnimationCurve:UIViewAnimationCurveEaseInOut];
[UIView setAnimationTransition:UIViewAnimationTransitionFlipFromLeft
forView:self.view cache:YES];
FavoritesView *fav = [[FavoritesView alloc]initWithStyle:UITableViewStylePlain];
UINavigationController *favNav = [[UINavigationController alloc]initWithRootViewController:fav];
favNav.modalTransitionStyle = UIModalTransitionStyleFlipHorizontal;
[self presentModalViewController:favNav animated:YES];
}
button code 2:
-(void)navFavoritesButton{
[UIView beginAnimations:#"flipview" context:nil];
[UIView setAnimationDuration:2];
[UIView setAnimationCurve:UIViewAnimationCurveEaseInOut];
[UIView setAnimationTransition:UIViewAnimationTransitionFlipFromLeft
forView:self.view cache:YES];
FavoritesView *fav = [[FavoritesView alloc]initWithStyle:UITableViewStylePlain];
fav.modalTransitionStyle = UIModalTransitionStyleFlipHorizontal;
[self presentModalViewController:fav animated:YES];
}
I'm having a weird problem;
If I'm using button 2 code all works good, the view is loaded, unArchived the data and display it on a tableView.
But if I'm using the button 1 code the app crash with the following log:
2013-04-21 16:51:56.714 YnetXML[21898:f803] -[__NSArrayM isEqualToString:]: unrecognized selector sent to instance 0x6b4fd30
2013-04-21 16:51:56.715 YnetXML[21898:f803] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[__NSArrayM isEqualToString:]: unrecognized selector sent to instance 0x6b4fd30'
*** First throw call stack:
(0x268c052 0x1a61d0a 0x268dced 0x25f2f00 0x25f2ce2 0xc312d1 0xc9830e 0x82123 0xc9764e 0xc96c1c 0xcbd56d 0xca7d47 0xcbe441 0xcbe4f9 0xeb5c68 0xc754a1 0xc7612b 0xeb54c7 0xc9e427 0xc9e58c 0x348c4 0xc9e5cc 0x34568 0x387d 0x268dec9 0xbd45c2 0xe0fd54 0x268dec9 0xbd45c2 0xbd455a 0xc79b76 0xc7a03f 0xc792fe 0xbf9a30 0xbf9c56 0xbe0384 0xbd3aa9 0x35a9fa9 0x26601c5 0x25c5022 0x25c390a 0x25c2db4 0x25c2ccb 0x35a8879 0x35a893e 0xbd1a9b 0x22ed 0x2215)
terminate called throwing an exception(lldb)
EDIT:
I deleted the line below and it works for both button 1 and 2 code.
What should cause the problem?
self.title = [unArchiver decodeObjectForKey:#"title"];
what could be the problem? Why it works well without the navigationController and crash with?
I'm trying to solve the problem for several hours, I tried all sorts of ways, I read online but nothing works. I just can not figure out what causes it to crash, help please!

Answer 1

I guess the problem lies with these three statements
self.title = [unArchiver decodeObjectForKey:#"title"];
self.pubDate = [unArchiver decodeObjectForKey:#"pubdate"];
self.description = [ unArchiver decodeObjectForKey:#"description"];
Try this:
//I guess problem with this, because only when you bring in a navigation controller , your app crashes so only when navigation controller comes into play the navigation bar appears and self.title is the text you see in the center of the navigation bar - so rename self.title to self.titlesArray or something
if([[unArchiver decodeObjectForKey:#"title"] isKindOfClass:[NSString class]])
{
//do not use self.title for other purposes, it is to set title of navigation bar.
self.title = [unArchiver decodeObjectForKey:#"title"];
}
self.pubDate = [unArchiver decodeObjectForKey:#"pubDate"];
self.description= [unArchiver decodeObjectForKey:#"description"];
Note: This is not the way to implement but this is just a way to find out whether these statements are the cause for your crash. Try this and tell me, we l figure out another way.