UIViewController presents a UINavigationController - no Nav Bar? - cocoa-touch

Question

I have an UIViewController with a table in it. Tapping a blue disclosure icon makes the view controller present a UINavigationController. This works fine and does make the navigation controller show up, but without a navigation bar, as below:
How would I go about making that magical Navbar showing up again? I really need it to present a map in the nav controller, and right now, that does not work.
EDIT: Here's the code I use to show it:
// scanned recently table view thing
- (void)tableView:(UITableView *)tableVieww didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
[tableVieww deselectRowAtIndexPath:indexPath animated:YES];
if(indexPath.section == 0) {
NSString *info = [[scannedBackups objectAtIndex:indexPath.row] objectForKey:#"data"];
NSArray *items = [info componentsSeparatedByString:#"&"];
scanCodeViewCohntroller.dict = [[NSMutableDictionary alloc] init];
int o;
for (o = 0; o < [items count]; o++) {
NSArray *secondItems = [[items objectAtIndex:o] componentsSeparatedByString:#"="];
[scanCodeViewCohntroller.dict setObject:[secondItems objectAtIndex:1] forKey:[secondItems objectAtIndex:0]];
}
/*NSError *err;
scanCodeViewCohntroller.dict = [NSPropertyListSerialization propertyListWithData:[foo dataUsingEncoding:NSUnicodeStringEncoding] options:NSPropertyListMutableContainersAndLeaves format:kCFPropertyListXMLFormat_v1_0 error:&err];
if(err != nil) {
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:#"Corrupted Data" message:[NSString stringWithFormat:#"Your Scanned Backup Data Store is corrupted. It will now be erased. %#", [err localizedDescription]] delegate:nil cancelButtonTitle:#"Dismiss" otherButtonTitles:nil];
[alert show];
[alert release];
scannedBackups = [[NSMutableArray alloc] init];
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
NSString *fullFileName = [NSString stringWithFormat:#"%#/scannedCodes.plist", documentsDirectory];
[scannedBackups writeToFile:fullFileName atomically:NO];
[tableView reloadData];
}*/
[scanCodeViewCohntroller.dict setObject:[[scannedBackups objectAtIndex:indexPath.row] objectForKey:#"date"] forKey:#"date"];
[scanCodeViewCohntroller initalizeData];
[self presentModalViewController:scanCodeViewCohntroller animated:YES];
}
}

Answer 1

You need to get the navigation controller and invoke setNavigationBarHidden:animated:. So, try:
[detailController.navigationController setNavigationBarHidden:NO animated:NO];
Edit:
Based on your edit, I would suggest replacing the final line:
[self presentModalViewController:scanCodeViewCohntroller animated:YES];
with:
[self.navigationController pushViewController:scanCodeViewCohntroller animated:YES];