Editing Table View

[mr curious]

Hey all,

I'm implementing an app from a book which displays a list of cities. Using a table view and nav controller. There's an Edit button on the right of the nav controller which when clicked allows the user to either delete a current city or add a new one.

here's the numberOfRowsInSection and cellForRowAtIndexPath, where cities is a NSMutableArray containing the cities.

- (NSInteger)tableView:(UITableView *)tv numberOfRowsInSection:(NSInteger)section
{
    // number of rows = number of City objects in citiesArray
    NSInteger count = cities.count; 
    
    if(self.editing) //if edit button was pressed increase count so the 'Add City' row can be added
    {
        count = count + 1; 
    }
    return count;
}

- (UITableViewCell *)tableView:(UITableView *)tv cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    UITableViewCell *cell = [tv dequeueReusableCellWithIdentifier:@"cell"];
    
    if( nil == cell ) 
    { 
        cell = [[[UITableViewCell alloc] initWithFrame:CGRectZero reuseIdentifier:@"cell"] autorelease]; 
    }    
    
    if (indexPath.row < cities.count)
    {
        City *thisCity = [cities objectAtIndex:indexPath.row];
        cell.textLabel.text = thisCity.cityName;
    }
    
    
    else
    {
        cell.textLabel.text = @"Add New City...";
        cell.textLabel.textColor = [UIColor lightGrayColor];
        cell.editingAccessoryType = UITableViewCellAccessoryDisclosureIndicator;
    }
    
    return cell;
}

In the cellForRowAtIndexPath method, how does the method know to only add the "Add City " option when in edit mode. My understanding of this method that the "add new City" section is only added when theindexPath.row == cities.count. But surely this is true regardless of whether the app os in Edit mode or not??

Thanks
mc

[mr curious]

Ok so I figured it out.
indexPath is an array which starts from 0. So if there are 4 cities, indexPath goes from 0 to 3. but cities.count starts from 1.
so cities.count = 4 and indexPath = 3.
The only time they'll be equal is when the edit button is pressed and cities.count is incremented by 1.

awesome!

mc