objective c - Using insert rows in a UITableView

Question

I'd like my UITableView to behave like the the table in the Contacts editor, i.e. the user should hit Edit and an "add new category" row should appear at the bottom of each section.

I'm using the below code to do this, but the problem is that there is no smooth transition as there is in Contacts. Instead, the new row suddenly appears. How can I get the animation?

Also, how do I respond to clicks on the "add new category" row? The row is not clickable in my current implementation.

Do I need to reload the data when the user starts editing? I am doing this because otherwise the insertion rows are never drawn.

Thanks.

- (void)setEditing:(BOOL)editing animated:(BOOL)animated {
    [super setEditing:editing animated:animated];
    [self.tableView setEditing:editing animated:animated];
    [tableView reloadData];
}

- (NSInteger)tableView:(UITableView *)_tableView numberOfRowsInSection:(NSInteger)section {
    // ...
    if( self.tableView.editing ) 
        return 1 + rowCount;
}

- (UITableViewCell *)tableView:(UITableView *)_tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
    // .....
    NSArray* items = ...;
    if( indexPath.row >= [items count] ) {
        cell.textLabel.text = @"add new category";
    }
    // ...

    return cell;
}

- (UITableViewCellEditingStyle)tableView:(UITableView *)tableView editingStyleForRowAtIndexPath:(NSIndexPath *)indexPath {
    NSArray* items = ...;

    if( indexPath.row == [items count] )
        return UITableViewCellEditingStyleInsert;

    return UITableViewCellEditingStyleDelete;
}

Answer 1

I was missing one thing. In setEditing:, instead of calling reloadData I should have done:

- (void)setEditing:(BOOL)editing animated:(BOOL)animated {
    [super setEditing:editing animated:animated];
    [self.tableView setEditing:editing animated:animated]; // not needed if super is a UITableViewController

    NSMutableArray* paths = [[NSMutableArray alloc] init];

    // fill paths of insertion rows here

    if( editing )
        [self.tableView insertRowsAtIndexPaths:paths withRowAnimation:UITableViewRowAnimationBottom];
    else
        [self.tableView deleteRowsAtIndexPaths:paths withRowAnimation:UITableViewRowAnimationBottom];

    [paths release];
}