errors populating fields of a detail view - ios

Question

I'm following along with the Big Nerd Ranch ios book, chapter 11. It uses a table view in the ItemsViewController to display a list of items and if you click on an item it transfers control to a DetailViewController that shows the details about the individual item. The DetailViewController.xib has outlets for these fields declared in the header file DetailViewController.h
__weak IBOutlet UITextField *nameField;
__weak IBOutlet UITextField *serialNumberField;
__weak IBOutlet UITextField *valueField;
__weak IBOutlet UILabel *dateLabel;
The application worked fine up to a point. If i clicked on an item, the new view would open but the fields were empty. Therefore, the tutorial introduced us to a way to have the fields populated with the values of each item. After introducing this new code to populate the fields, the application crashes with the following errors once I click on an item to view its details
2014-02-12 07:18:30.720 Homepwner[3180:a0b] -[UIView setText:]: unrecognized selector sent to instance 0x89ef8c0
2014-02-12 07:18:30.724 Homepwner[3180:a0b] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[UIView setText:]: unrecognized selector sent to instance 0x89ef8c0'
Based on the code excerpts below can you explain why the application might be crashing when I click on one of the items in the list to open it in the detail view?
This is the code we are given to populate the fields
DetailViewController.m
- (void)viewWillAppear:(BOOL)animated
{
[super viewWillAppear:animated];
[nameField setText:[item itemName]];
[serialNumberField setText:[item serialNumber]];
[valueField setText:[NSString stringWithFormat:#"%d", [item valueInDollars]]];
// Create a NSDateFormatter that will turn a date into a simple date string
NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
[dateFormatter setDateStyle:NSDateFormatterMediumStyle];
[dateFormatter setTimeStyle:NSDateFormatterNoStyle];
// Use filtered NSDate object to set dateLabel contents
[dateLabel setText:[dateFormatter stringFromDate:[item dateCreated]]];
// Change the navigation item to display name of item
[[self navigationItem] setTitle:[item itemName]];
}
In ItemViewController.m, we added the middle three lines in this function so that the DetailViewController has its item before viewWillAppear: gets called
- (void)tableView:(UITableView *)aTableView
didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
DetailViewController *detailViewController = [[DetailViewController alloc] init];
NSArray *items = [[BNRItemStore sharedStore] allItems];
BNRItem *selectedItem = [ items objectAtIndex: [indexPath row]];
[detailViewController setItem:selectedItem];
[[self navigationController] pushViewController:detailViewController animated:YES];
}

Answer 1

Since the nameField property is initialized through a NIB/Storyboard, the most likely reason for the problem that you are seeing is an incorrect connection done in the Interface Builder. It appears that the nameField outlet is connected to the parent of UITextEdit, as opposed to the UITextEdit itself.
Removing and re-creating the nameField property should fix the problem. First, remove the property from the code. Then, control-drag from the text field into the DetailViewController's class extension inside DetailViewController.m, and name the property nameField.