Incorrect updating content of UITableView - iphone

Question

I have TableView which number of rows depends on the number of NSStrings in NSMutableArray friendsNames.
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
return friendsNames.count + 1;
}
Also each row displays that NSString at the respective index of friendsNames. Everything seems to be very simple. But when i remove a string from friendsNames and use reloadData method then weird thing happens: UITableView removes LAST row, not the row with the string which was just removed from friendsNames. Could you please explain me what's going on and what should i do to fix it?
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
NSString *MyIdentifier = [NSString stringWithFormat:#"MyIdentifier %i", indexPath.row];
MyTableCell *cell = (MyTableCell *)[friendsList dequeueReusableCellWithIdentifier:MyIdentifier];
if (cell == nil) {
cell = [[[MyTableCell alloc] initWithFrame:CGRectZero reuseIdentifier:MyIdentifier] autorelease];
//create columns
for (int i = 0;i < 6;i++)
[cell.contentView addSubview:[self createGrid:i :indexPath]];
}
return cell;
}
and here is the method which creates columns.it's being called from cellForRowAtIndexPath and it's pretty ugly
- (UILabel *)createGrid:(int)columnIndex :(NSIndexPath *)indexPath
{
CGFloat widths [6] = {35.0,62.0,35.0,35.0,35.0,35.0};//two arrays holding widths of the columns and points where left sides begin
CGFloat leftSides [6] = {0.0,35.0,97.0,132.0,167.0,202.0};
NSArray *titles = [[[NSArray alloc] initWithObjects:#"Status",#"ID",#"Wins",#"Losses",#"Withdrawls",#"Win %", nil] autorelease];
UILabel *columnLabel = [[[UILabel alloc] initWithFrame:CGRectMake(leftSides[columnIndex],0.0,widths[columnIndex], friendsList.rowHeight)] autorelease];
if (indexPath.row == 0)
columnLabel.text = [titles objectAtIndex:columnIndex];
else
{
switch (columnIndex)
{
case 0:
{
BOOL isOnline = [[[receivedUsers objectForKey:[friendsNames objectAtIndex:indexPath.row - 1]] objectAtIndex:0] boolValue];
columnLabel.text = isOnline ?#"On" :#"Off";
}
break;
case 1:
columnLabel.text = [friendsNames objectAtIndex:indexPath.row - 1];
break;
case 2:
columnLabel.text = [NSString stringWithFormat:#"%i",[[[receivedUsers objectForKey:[friendsNames objectAtIndex:indexPath.row - 1]] objectAtIndex:1] intValue] ];
break;
case 3:
columnLabel.text = [NSString stringWithFormat:#"%i",[[[receivedUsers objectForKey:[friendsNames objectAtIndex:indexPath.row - 1]] objectAtIndex:2] intValue] ];
break;
case 4:
columnLabel.text = [NSString stringWithFormat:#"%i",[[[receivedUsers objectForKey:[friendsNames objectAtIndex:indexPath.row - 1]] objectAtIndex:3] intValue] ];
break;
case 5:
columnLabel.text = [NSString stringWithFormat:#"%f",[[[receivedUsers objectForKey:[friendsNames objectAtIndex:indexPath.row - 1]] objectAtIndex:4] floatValue] ];
break;
}
}
columnLabel.layer.borderColor = [[UIColor blackColor] CGColor];
columnLabel.layer.borderWidth = 1.0;
columnLabel.font = [UIFont systemFontOfSize:8.0];
columnLabel.textAlignment = UITextAlignmentCenter;
columnLabel.textColor = [UIColor blackColor];
columnLabel.autoresizingMask = UIViewAutoresizingFlexibleRightMargin | UIViewAutoresizingFlexibleHeight;
return columnLabel;
}

Answer 1

It's a reusable cell problem. Just change your code like that:
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
NSString *myIdentifier = [NSString stringWithFormat:#"MyIdentifier %i", indexPath.row];
MyTableCell *cell = (MyTableCell *)[friendsList dequeueReusableCellWithIdentifier:myIdentifier];
if (cell == nil) {
//Create a new cell
cell = [[[MyTableCell alloc] initWithFrame:CGRectZero reuseIdentifier:myIdentifier] autorelease];
}
//Configure the cell
//Remove all columns
for(UIVIew *subview in cell.contentView.subviews) {
[subview removeFromSuperview];
}
//Create columns
for (int i = 0;i < 6;i++) {
[cell.contentView addSubview:[self createGrid:i :indexPath]];
}
return cell;
}