Question

I have an NSMutableArray with objects within it and I use the following code to add/remove objects from the UITableView. It works but only after closing and relaunching the app, not straight away. Why is this? Here is my code (maincelltext is the title in the cell and subtitlecelltext is the subtitle):

maincelltext = [[NSMutableArray alloc] init];
subtitlecelltext = [[NSMutableArray alloc] init];

[maincelltext addObject:@"TITLE"];
[subtitlecelltext addObject:@"SUBTITLE TEST"];

EDIT: Here is my UITableView code:

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

static NSString *CellIdentifier = @"Cell";

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

cell.textLabel.font = [UIFont fontWithName:@"HelveticaBold" size:16.0];

cell.textLabel.adjustsFontSizeToFitWidth = YES; 
cell.textLabel.numberOfLines = 1;

// Configure the cell.
UIImage *cellImage = [UIImage imageNamed:@"warning.png"];
CGRect cropRect = CGRectMake(0.0, 0.0, 12.0, 12.0);
CGImageRef croppedImage = CGImageCreateWithImageInRect([cellImage CGImage], CGRectMake(0.0f,0.0f,cellImage.size.width,cellImage.size.height));
UIImageView *myImageView = [[UIImageView alloc] initWithFrame:cropRect];
[myImageView setImage:[UIImage imageWithCGImage:croppedImage]]; 
CGImageRelease(croppedImage);
[self.view addSubview:myImageView];

cell.imageView.image = cellImage;

NSString *subjectString = [maincelltext objectAtIndex: [indexPath row]];

cell.textLabel.text = subjectString;

NSString *subtitle = [subtitlecelltext objectAtIndex: [indexPath row]];

cell.detailTextLabel.text = subtitle;

if(maincelltext.count == 0){

    NSString *notabledata = [NSString stringWithFormat:@"No Dates Set"];
    [maincelltext addObject:notabledata];

}

return cell;
} 

Thanks!

Answer 1

you need to tell the UITableView that it needs to insert the rows. First determine the index in the array the new object(s) are now at, then tell the UITableView to insert the rows like this:

NSIndexPath *indexPathOfNewObject=[NSIndexPath indexPathForRow: newObjectIndex section:0];
NSArray *indexPathArray=[NSArray arrayWithObject: indexPathOfNewObject];

[self.tableView beginUpdates];
// Note that UITableViewRowAnimationAutomatic is for iOS5 only.
[self.tableView insertRowsAtIndexPaths: indexPathArray withRowAnimation:UITableViewRowAnimationAutomatic];
[self.tableView endUpdates];

by using this method, you will get the cool animation effect on the tableView.

Alternatively, you could just call [self.tableView reloadData] and it will just reload all the data.

Good luck!