Table doesn't Scroll Programmatically

Discussion in 'iOS Programming' started by Sergio10, Nov 10, 2009.

  1. macrumors regular

    Joined:
    Oct 3, 2007
    #1
    Hi,

    I need on button clicking to scroll table programmatically. But the following code does nothing:
    PHP:
    - (IBAction)clickAction:(id)sender
    {
        [
    tableView scrollToRowAtIndexPath:indexPath atScrollPosition:UITableViewScrollPositionTop animated:NO];
        [
    tableView reloadData];
    }

    - (
    NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
    {
        return 
    1;
    }

    - (
    NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section 
    {        
        return 
    3;
    }

    - (
    UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath 
    {        
        switch (
    indexPath.row
        {
            case 
    ZERO_VALUE:
            {
                return 
    firstCell;
            } break;
                
            case 
    1:
            {
                return 
    secondCell;    
            } break;
                
            case 
    2:
            {
                return 
    thirdCell;    
            } break;        
        };
    }

    - (
    UITableViewCellAccessoryType)tableView:(UITableView *)tableView accessoryTypeForRowWithIndexPath:(NSIndexPath *)indexPath 
    {    
        return 
    UITableViewCellAccessoryNone;
    }

    - (
    void)tableView:(UITableView *)tableView accessoryButtonTappedForRowWithIndexPath:(NSIndexPath *)indexPath 
    {    
        [
    self tableView:tableView didSelectRowAtIndexPath:indexPath];
    }

    - (
    void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
    {
    }
    Guys, how to solve the problem?
     
  2. Moderator

    dejo

    Staff Member

    Joined:
    Sep 2, 2004
    Location:
    The Centennial State
    #2
    Where are you setting the indexPath that's used in your IBAction?
     
  3. thread starter macrumors regular

    Joined:
    Oct 3, 2007
    #3
    Code:
    - (IBAction)clickAction:(id)sender
    {
        NSIndexPath *indexPath = [[NSIndexPath alloc] init];
        indexPath = [NSIndexPath indexPathForRow:1 inSection:0];
    
        [tableView scrollToRowAtIndexPath:indexPath atScrollPosition:UITableViewScrollPositionTop animated:NO];
        [tableView reloadData];
    }
    
    It is also don't work.
     
  4. macrumors member

    Joined:
    Jul 2, 2009
    #4
    Code:
    - (IBAction)clickActionid)sender
    {
    NSIndexPath *indexPath = [[NSIndexPath alloc] init];
    indexPath = [NSIndexPath indexPathForRow:1 inSection:0];
    
    [tableView scrollToRowAtIndexPath:indexPath atScrollPosition:UITableViewScrollPositionTop animated:NO];
    [tableView reloadData];
    } 
    
    As an aside, this will leak memory. You don't need to alloc-init the indexPath.
     
  5. Moderator

    dejo

    Staff Member

    Joined:
    Sep 2, 2004
    Location:
    The Centennial State
    #5
    tableView is an instance variable that's defined and assigned elsewhere?

    P.S. And if you really want to scroll to the very top, you need to use:
    Code:
    NSIndexPath *indexPath = [NSIndexPath indexPathForRow:[B][COLOR="Red"]0[/COLOR][/B] inSection:0];
    Rows (and sections) are zero-indexed.
     

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