Accessing string within an array within a plist iphone

Question

I have a plist with root of type dictionary containing keys of type array, and each array has three items of type string.

I want to access the strings and pass them to a view controller.

This line is successful in my cellForRowAtIndexPath

NSLog(@"Strings from plist: %@", [[self.aDictionary objectForKey:(@"%@",[self.keys objectAtIndex:row])] objectAtIndex:0]);

When I put the same line in my didSelectRowAtIndexPath method I get a BAD_ACCESS error.

Any suggestions as to how to get at the strings would be helpful.

Here is my .plist

<dict>
    <key>Derivative</key>
    <array>
        <string>Derivative 1</string>
        <string>front.png</string>
        <string>back.png</string>
    </array>
    <key>Rolle&apos;s Theorem</key>
    <array>
        <string>Rolle&apos;s Theorem 1</string>
        <string>front.png</string>
        <string>3bk.png</string>
    </array>
    <key>Chain Rule</key>
    <array>
        <string>Chain Rule</string>
        <string>chainrule1.png</string>
        <string>chainrule1_bk.png</string>
    </array>
</dict>
</plist>

And here are the two methods:

 - (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {

    static NSString *CellIdentifier = @"Cell";

    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
    if (cell == nil) {
        cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier] autorelease];
    }


    NSUInteger row = [indexPath row];

    cell.backgroundColor = [UIColor purpleColor];
    cell.textLabel.textColor = [UIColor blackColor];

    cell.textLabel.text = [self.keys objectAtIndex:row];

    // Key output to NSLOG accessing elements from the plist
    NSLog(@"Strings from plist: %@", [[self.aDictionary objectForKey:(@"%@",[self.keys objectAtIndex:row])] objectAtIndex:0]);

    cell.textLabel.font = [UIFont fontWithName:@"Verdana-Bold" size:18.0];
    cell.textLabel.numberOfLines = 2;
    cell.selectedBackgroundView = [[[UIImageView alloc] initWithImage:[UIImage imageNamed:@"TableCell_BG.png"]] autorelease];

    return cell;
}


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

    NSUInteger row = [indexPath row];
    NSLog(@"Row selected was: %i", row);

    // Key output to NSLOG accessing elements from the plist
    //NSLog(@"Strings from plist: %@", [[self.aDictionary objectForKey:(@"%@",[self.keys objectAtIndex:row])] objectAtIndex:0]);


/*
    NSString *selectedCard = [[aDictionary objectForKey:(@"%@",[keys objectAtIndex:row])] objectAtIndex:0];
    NSLog(@"Showing Flash Card: %@", selectedCard);
*/

    FlashCardViewController *flashVC = [[FlashCardViewController alloc] initWithNibName:@"FlashCardViewController" bundle:nil];

    id aKey = [keys objectAtIndex:row];

    flashVC.aSelectedCard = [[aDictionary objectForKey:aKey] objectAtIndex:0];

    [self.navigationController pushViewController:flashVC animated:YES];
    [flashVC release];

}

Answer 1

My guess is that you are not retaining aDictionary or keys, or you have another memory problem that is manifesting at that point in the code. But it's difficult to tell without the rest of the code.

Answer 2

Change this line to

flashVC.aSelectedCard = [[aDictionary objectForKey:[keys objectAtIndex:row]] objectAtIndex:0];

Where does the program crash, what line?