IPhone Development - Problems on building cells

Question

Hi guys,

I have an app that has a lot of views including tableViews but one of them has a problem that I don't know how to solve. When the constructor of the cell is called:

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

the parameter cellForRowAtIndexPath:(NSIndexPath *)indexPath get a random and strange number. I'm building this tableView in the same way as others. Somebody has any idea about what is happening?

Thanks, Claudio

Answer 1

The trick to indexPath is using the UITableView extention properties indexPath.section and indexPath.row.

In other words if you have a simple list of string:

self.data = [NSArray arrayWithObjects:@"One", @"Two", @"Three", nil];

then in tableView:cellForRowAtIndexPath: you want to do:

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

If you have an Array within an Array:

self.data = [NSArray arrayWithObjects:
                [NSArray arrayWithObjects:@"A.1", @"A.2", nil],
                [NSArray arrayWithObjects:@"B.1", @"B.2", nil],
                nil];

Then you'll want to check the section and row property:

NSArray *strings = [self.data objectAtIndex:indexPath.section];
cell.textLabel.text = [strings objectAtIndex:indexPath.row];

Make sure you return the right numbers for numberOfSectionsInTableView: and tableView:numberOfRowsInSection:.