Question

A really simple question here. I have a label on one view and a UITableView on the previous view. I have got a segue triggered when the user selects the row and I want the label to be updated with the text from that row. Here’s one example, the code is pretty obvious.

- (void)tableView:(UITableView *)tableView 
didSelectRowAtIndexPath:(NSIndexPath *)indexPath {

NSString *countrySelection;

switch (indexPath.section) {

    case kFirstSection:
        countrySelection = [[NSString alloc]
                            initWithFormat:@"The country you have chosen is %@",
                            [self.MyCountries objectAtIndex: indexPath.row]];
        [self performSegueWithIdentifier:@"doneResults" sender:self];
        self.countryResult.text = countrySelection;
break;

The label isn’t updated and I just don’t know what should be done.

Thanks in advance!

Answer 1

These kind of things really need to be set on the View Controller that owns them. Use a public property to pass the value of the selected country to that view controller as outlined below:

First, create a property called something like:

@property(non atomic,strong) NSString *countryChosen;

in the destination View Controller, and make sure to @synthesize it

No reason to create another property for the IndexPath. Just use

// Pass along the indexPath to the segue prepareForSegue method, since sender can be any object
[self performSegueWithIdentifier:@"doneResults" sender:indexPath]; 

in the didSelectRowAtIndexPath method.

Then in the prepareForSegueMethod:

MyDestinationViewController *mdvc = segue.destinationViewController;
NSIndexPath *indexPath = (NSIndexPath *)sender;

mdvc.countryChosen = [self.MyCountries objectAtIndex: indexPath.row]];

On the viewDidLoad event of the Destination VC, just use:

self.countryResult.text = countryChosen;

* EDIT *
To deal with a datasource that has multiple sections, just use the same logic that you have in the cellForRowAtIndexPath.

NSDictionary *selRow = [[self.countriesIndexArray valueForKey:[[[self.countriesIndexArray allKeys] sortedArrayUsingSelector:@selector(localizedCaseInsensitiveCompare:)] objectAtIndex:indexPath.section]] objectAtIndex:sindexPath.row];

Change this to suit your needs, but basically you are implementing the same logic that you would to display a cell, except you are specifying the indexPath (both section and row) that you want.

Then something like the following to set that property on the destination VC:

self.countryResult.text = [selRow valueForKey@"Country"];