Question

In my application i display item’s. My JSON feed contains 50 items but first i want to display 25 and when a user scrolls down to the last row it need to load more items.

i’m doing:

Downloading the JSON feed;

NSString *jsonString = [NSString 
                        stringWithContentsOfURL:[NSURL URLWithString:xmlDataUrl] 
                        encoding:NSStringEncodingConversionAllowLossy
                        error:nil];
SBJSON *parser = [[SBJSON alloc] init];
NSDictionary *results = [parser objectWithString:jsonString error:nil];
parser = nil;
[self setTableData:[results objectForKey:@"feed"]];

//

- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
    // Return the number of sections.
    return 1;
}

//

 - (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
    {
        // Return the number of rows in the section.
        //return [tableData count];
        return 25;
    }

And detect last row:

   if(indexPath.row == [self.tableData count] - 1) 
    {

        NSLog(@"Last Row");
    }

But it’s not detecting the last row. Is this because the JSON it’s downloading contains more than 25 rows?

And how i can add a new row is something like [self.tableDate count] +1; possible?

If i do return [tableData count]; it’s detecting the last row but the rows are already filled for 100% i need to display 25/50 and than +1

Answer 1

Where are you calling that second block of code? Is it in your table delegate’s willDisplayCell: method?

In one of my projects, I have very similar code

- (void)tableView:(UITableView *)tableView willDisplayCell:(UITableViewCell *)cell forRowAtIndexPath:(NSIndexPath *)indexPath
{
    if (indexPath.row == self.search.count && [tableView.indexPathsForVisibleRows containsObject:indexPath])
    {
        [self.search findMoreStuff];
    }
}

With an extra row appended after the ones created for self.search, so in my case I’m checking for self.search.count, but you probably want to look at self.search.count-1