Adding new rows to UITableViewCell - iphone

Question

In my application,I will be displaying only one row on the UITableView initially. I want to increase the rows as user loads the previous row with data(an uiimage, here). As now i'm returning value 1, in numberOfRowsInSection: method, since I don't know how to implement it in the required way. Please help.
My cellForRowAtIndexPath: method is
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
static NSString *CustomCellIdentifier = #"CustomCellIdentifier";
CustomCell *cell = (CustomCell *)[tableView dequeueReusableCellWithIdentifier:CustomCellIdentifier];
if (cell == nil) {
cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CustomCellIdentifier ] autorelease];
NSArray *nib = [[NSBundle mainBundle] loadNibNamed:#"CustomCell" owner:self options:nil];
for (id currentObject in nib){
if ([currentObject isKindOfClass:[CustomCell class]]){
cell = (CustomCell *)currentObject;
cell.viewController = self;
break;
}
}
}
if (j<15){
cell.imageView.image = nil;
if (count!=0)
{
#try{
NSInteger row = [indexPath row];
cell.imageView.image = [array objectAtIndex:row];
}
#catch (NSException* ex) {
NSLog(#"doSomethingFancy failed: %#",ex);
}
}
}
cell.showsReorderControl = YES;
return cell;
[array release];
}
that if condition and count is nothing but just for checking the correct functioning of the mutable array, 'array'.

Answer 1

You should read this documentation: http://developer.apple.com/iphone/library/documentation/UserExperience/Conceptual/TableView_iPhone/Introduction/Introduction.html
Have a look to the related samples as well.
Note: in your code [array release] won't be called since you've got a return statement just before it.

Answer 2

When you reach the cellForRowAtIndexPath at a certain indexPath, it means that row is being displayed. If you reach the last row you can insert a new row into the table. To do that, you just need to increase the count that will get returned by the tableView:numberOfRowsInSection function.
I'm guessing your numberOfRowsInSection function will look something like this:
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
return section==0 ? [array count] : 0;
}
So basically, inside cellForRowAtIndexPath, add the following code:
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
...
if([indexPath row]==[array count]-1) {
[array addObject:(NEXT_IMAGE)];
}
return cell;
}
You also need to refresh the table. One way is to just call reloadData on your UITableView, but the preferred way is to call beginUpdates/insertRowsAtIndexPaths/endUpdates on the table so that you can show a nice animation of the row being inserted.