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PO(iPad/iPhone) refresh a table cell while it is on screen
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copied!<p>I have a table view with custom cells, each of which have images and some text which must be parsed from a webpage. I have and operation queue which gets the data from the page and calls the method <code>(void)addLoadedImageAndExcerpt:(NSString *)imgExc</code> in the tableviewcontroller after each page's data is loaded and stores the data in 2 arrays. I need each cell to refresh once the image and text that associated with it are loaded into these 2 arrays (named "articleExcerpts" and "imageDataObjects"). </p> <p>the method is as follows:</p> <pre><code>- (void)addLoadedImageAndExcerpt:(NSString *)imgExc { NSArray *imgAndExcerpt = [imgExc componentsSeparatedByString:@"{|}"]; [articleExcerpts addObject:[imgAndExcerpt objectAtIndex:1]]; NSData * imageData = [[NSData alloc] initWithContentsOfURL: [NSURL URLWithString: [imgAndExcerpt objectAtIndex:0]]]; [imageDataObjects addObject:imageData]; //count how many rows have been loaded so far. loadedCount ++; [self.table reloadData];//table is a UITableView [imageData release]; } </code></pre> <p>the problem is, I can't get the cells to change while they are on screen. Once I scroll, they show the proper data, while they are on screen, I can't get them to change. I tried the methods outlined <a href="https://stackoverflow.com/questions/1017439/refreshing-a-uitableview">here</a> and <a href="https://stackoverflow.com/questions/3577031/update-value-in-table-cell-on-iphone">here</a>, but they don't work. I tried calling <code>tableView:cellForRowAtIndexPath:</code> for the relevant row and modifying the variables, but that didn't solve anything because that method seems to create a new cell every time is is called, and doesn't get the existing ones (I'll post the code for that method further down).<br> Using <code>[self.table reloadData]</code> as I have it now doesn't seem do anything either, which really confuses me...</p> <p>my <code>tableView:cellForRowAtIndexPath:</code> method (I bet the problem is here. I'm not convinced I creating my custom cells properly) </p> <pre><code>- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath { static NSString *CellIdentifier = @"CustomizedCell"; CustomCell *cell = (CustomCell *)[tableView dequeueReusableCellWithIdentifier:CellIdentifier]; if (cell == nil) { NSArray *topLevelObjects = [[NSBundle mainBundle] loadNibNamed:@"CustomCell" owner:self options:nil]; for (id currentObject in topLevelObjects){ if ([currentObject isKindOfClass:[UITableViewCell class]]){ cell = (CustomCell *) currentObject; break; } } } // Configure the cell... //title cell.titleString = [titles objectAtIndex:indexPath.row]; //date cell.dateString = [dates objectAtIndex:indexPath.row]; //Photo. check if imageDataObjects array is complete up to the current row yet if (loadedCount > indexPath.row) { if ([imageDataObjects objectAtIndex:indexPath.row] != @"NA") { cell.imageData = [imageDataObjects objectAtIndex:indexPath.row]; } else { cell.imageData = NULL; } } //Excerpt. check if loadedCount array is complete up to the current row yet if (loadedCount > indexPath.row) { cell.exerptString = [articleExcerpts objectAtIndex:indexPath.row]; } return cell; } </code></pre> <p>what am I missing? </p>

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