Retrieving UITableViewCell Label Values For Passing To Modal Edit View - objective-c

Question

I am trying to pass existing attribute values for a managed object, to a modal segue view for editing. From "editing mode," I'm going from a UITableViewController subclass (BreadRackTableViewController), using a modal segue to a UIViewController subclass (EditBreadRackTableViewController) by means of an embedded UINavigationController. Normal TableViewCell selection pushes to another UITableViewController subclass, but that's not important for the time being.
I've added properties to my editing view controller header (and #synthesized), to function as getters:
#property (nonatomic, strong) id existingBreadRackDataName;
#property (nonatomic, strong) id existingBreadRackDataDetails;
What I'm trying to do is populate the edit view's fields with the existing Core Data Entity Attributes, which would have been previously set by the user (in theory). I can get the data to show up if I pass along a literal string value, but I need to retrieve and pass the existing data.
Here's what I have currently:
-(void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
{
if ([[segue identifier] isEqualToString:#"editBreadRackSegue"])
{
EditBreadRackTableViewController *ebrtvc = (EditBreadRackTableViewController *)[segue destinationViewController];
NSIndexPath *indexPath = [self.tableView indexPathForSelectedRow];
BreadRackClass *breadRackClass = [[self fetchedResultsController]objectAtIndexPath:indexPath];
// [ebrtvc setBreadRackClass:breadRackClass];
ebrtvc.existingBreadRackDataName = breadRackClass.breadRackDataName;
ebrtvc.existingBreadRackDataDetails = [breadRackClass valueForKey:#"breadRackDataDetails"];
}
}
These last two lines of code...
ebrtvc.existingBreadRackDataName = breadRackClass.breadRackDataName;
ebrtvc.existingBreadRackDataDetails = [breadRackClass valueForKey:#"breadRackDataDetails"];
...they both return nil. If I specify a literal string though, that literal string shows up where it needs to.
All of that said, my question is:
How do I retrieve the attribute's key value for that selected row (or just the textLabel and detailTextLabels), and assign it to my setter?
Solution:
-(void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
{
if ([[segue identifier] isEqualToString:#"editBreadRackSegue"])
{
NSIndexPath *indexPath = [self.tableView indexPathForCell:sender];
BreadRackClass *breadRackClass = [[self fetchedResultsController]objectAtIndexPath:indexPath];
[segue.destinationViewController setExistingBreadRackDataName:[breadRackClass valueForKey:#"breadRackDataName"]];
[segue.destinationViewController setExistingBreadRackDataDetails:[breadRackClass valueForKey:#"breadRackDataDetails"]];
}
// code for other segues here...
}
I ended up removing the ebrtv variable, and cleaned up the code a little bit. What worked though, was using the indexPathForCell:sender instead of indexPathForSelectedRow when declaring my indexPath for breadRackClass.

Answer 1

I think the indexPathForSelectedRow could be a problem.
You can just pass the indexPath from the didSelectRowAtIndexPath to the prepareForSegue , like:
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
[self performSegueWithIdentifier:#"editBreadRackSegue" sender:indexPath];
}
-(void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
{
if ([[segue identifier] isEqualToString:#"editBreadRackSegue"])
{
NSIndexPath *clickedIndexPath = (NSIndexPath*)sender;
if( [clickedIndexPath isKindOfClass:[NSIndexPath class]] ){
BreadRackClass *breadRackClass = [[self fetchedResultsController]objectAtIndexPath:clickedIndexPath];
EditBreadRackTableViewController *ebrtvc = (EditBreadRackTableViewController *)[segue destinationViewController];
ebrtvc.existingBreadRackDataName = breadRackClass.breadRackDataName;
ebrtvc.existingBreadRackDataDetails = [breadRackClass valueForKey:#"breadRackDataDetails"];
}
}
}
Let me know if it works for you.