Ios – Getting images from url in Table View asynchronously

iosnsurlconnectionuitableview

So I am developing an app which contains a table view that has images in cells. I download all these images from a URL and store them in an array. I need to load these images asynchronously so I decided to use NSURLConnectionDataDelegate. I tried this code:

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    static NSString *CellIdentifier = @"Cell";

    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
    if (cell == nil) {
        cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier];
    }

    NSUInteger row = [indexPath row];
    NSURLRequest *theRequest = [NSURLRequest requestWithURL:[NSURL URLWithString:[URLsArray objectAtIndex:row]]];
    NSURLConnection *theConnection = [[NSURLConnection alloc] initWithRequest:theRequest delegate:self];
    if (theConnection) {
        receicedData = [[NSMutableData alloc] init];
    } else {
        NSLog(@"Failed.");
    }
    return cell;
}

But it doesn't work. And I don't know what to write in:

-(void)connectionDidFinishLoading:(NSURLConnection *)connection

to set images to imageViews in cells. Can anyone help?

Best Answer

I would highly recommend using AFNetworking simply because it takes care of these kind of concerns.

At the very least, take a look at their UIImageView category as it allows you to do this:

UIImageView *imgView = //alloc, get it from a nib, whatever;
[imgView setImageWithURL:[NSURL URLWithString:@"StringPath"]];

Related Solutions

R – how to compare a NSURLconnection http response data with a string value in iphone

I would use the following line, to see that the response is actually the OK string, cause it may contain white space or other characters.

NSLog(@"string1 = '%@' temp = '%@'", string1, temp);

put this line before the if statement like this...

NSString *string1 = @"OK";
NSLog(@"string1 = '%@' temp = '%@'", string1, temp);
if([string1 isEqualToString:temp]){   // HERE IS THE PROBLEM, THE STRINGS ARE NOT GETTIN COMPARED

If extra whitespace is the reason why the comparison is failing then you can trim whitespace from you string by using the following method:

+(NSString *)trim:(NSString *)value {
    return [value stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceCharacterSet]];
}

Ios – Expand and Collapse tableview cells

If you want the cell to get physically bigger, then where you have your store IndexPath, in heightForRow: use:

override func tableView(tableView: UITableView, heightForRowAtIndexPath indexPath: NSIndexPath) -> CGFloat {
    if selectedIndexPath == indexPath {
      return 230 + extraHeight
    }
    return 230.0
}

Then when you want to expand one in the didSelectRow:

selectedIndexPath = indexPath
tableView.beginUpdates
tableView.endUpdates

Edit

This will make the cells animate themselves getting bigger, you dont need the extra animation blocks in the cell.

Edit 2

 override func tableView(tableView: UITableView, didSelectRowAtIndexPath indexPath: NSIndexPath) {
        if(selectedIndexPath == indexPath) {
          selectedIndexPath = nil

          if let cell = tableView.cellForRowAtIndexPath(indexPath) as? MyTicketsTableViewCell {
            cell.collapse()
          }
          if let cell = tableView.cellForRowAtIndexPath(NSIndexPath(forRow:indexPath.row+1, section: indexPath.section) as? MyTicketsTableViewCell {
            cell.collapse()
          }
        } else {
          selectedIndexPath = indexPath

          if let cell = tableView.cellForRowAtIndexPath(indexPath) as? MyTicketsTableViewCell {
              cell.expand()
          }

          if let cell = tableView.cellForRowAtIndexPath(NSIndexPath(forRow:indexPath.row+1, section: indexPath.section) as? MyTicketsTableViewCell {
             cell.expand()
          }
        }

        tableView.beginUpdates()
        tableView.endUpdates()
    }

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