iOS Table View methods not called

[Spencie]

Hi all, please bear with me as I am new to iOS programming. I have a tableview inside one of my Viewcontrollers, but none of my tableview methods are being called. The table view is also properly linked to datasource and delegate.

For example, below I have many methods that change the size and color/contents of the tableview, but when I run the application, nothing happens. The tableview just looks like the default size/color.

Any input would be helpful.

- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath{
    //tableview cell height
    return 60;
    
    
}
- (NSInteger)tableView:(UITableView *)tableView numberOfSectionsInTableView:(NSInteger)section {
    return 1;


}

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{

    return [storyList count];
}

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    
    static NSString *CellIdentifier = @"Cell";
    
    UITableViewCell *cell = (UITableViewCell *) [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
    
     if (cell == nil) {
     cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:CellIdentifier];
        
    }

    
    //---------- CELL BACKGROUND IMAGE -----------------------------
    UIImageView *imageView = [[UIImageView alloc] initWithFrame:cell.frame];
    UIImage *image = [UIImage imageNamed:@"LightGrey.png"];
    imageView.image = image;
    cell.backgroundView = imageView;
    [[cell textLabel] setBackgroundColor:[UIColor clearColor]];
    [[cell detailTextLabel] setBackgroundColor:[UIColor clearColor]];
    
    
    cell.textLabel.text = [storyList objectAtIndex:indexPath.row];
    cell.detailTextLabel.text = [storyListAuthor objectAtIndex:indexPath.row];
    

    return cell;
    [tableView reloadData];
}

-(void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath{
    
    DetailViewController *detail = [self.storyboard instantiateViewControllerWithIdentifier:@"detail"];
    detail.state = [datasource objectAtIndex:indexPath.row];
    detail.capital = [storyListAuthor objectForKey:detail.state];
    [self.navigationController pushViewController:detail animated:YES];
    [tableView deselectRowAtIndexPath:indexPath animated:YES];
    
}

 

[dejo]

The table view is also properly linked to datasource and delegate.

Have you confirmed this? Have you done any other debugging?

Also, you don't need to call [tableView reloadData]; inside your tableView:cellForRowAtIndexPath:

 

[Duncan C]

Have you confirmed this? Have you done any other debugging?

Also, you don't need to call [tableView reloadData]; inside your tableView:cellForRowAtIndexPath:

In fact, doing so will likely cause an infinitely loop, possibly an infinite recursion crash.

 

[xStep]

Have you confirmed this? Have you done any other debugging?

Also, you don't need to call [tableView reloadData]; inside your tableView:cellForRowAtIndexPath:

As luck would have it, in the sample provided, the method is being returned before that call happens.

Interestingly I see no data displayed when I place the reload just before the return. That infinite loop must be blocking the display of the data.

 

[Duncan C]

As luck would have it, in the sample provided, the method is being returned before that call happens.

Interestingly I see no data displayed when I place the reload just before the return. That infinite loop must be blocking the display of the data.

Never call reload from cellForRowAtIndexPath. Ever, under any circumstances.

It isn't clear what you're saying. Post your code.

 

[xStep]

Never call reload from cellForRowAtIndexPath. Ever, under any circumstances.

It isn't clear what you're saying. Post your code.

I was playing with some test code to see if I'd get a crash when placing reload into the cellForRowAtIndexPath method. I didn't but perhaps I didn't run it long enough, on the simulator. Well, that was one thing I was looking at.

As for what did happen, the single row I had working was no longer displayed, I was able to scroll the empty table which also appeared to have a double height top row.

 

[Spencie]

Hi all, I didn't realize all the issues you guys pointed out. Turns out

  return [storyList count];

returned 0, the array had 0 items. I just set it to return 10 and then it worked. Nevertheless, thanks for pointing out the other issues, I will fix them.

 

[Duncan C]

Re your signature

Hi all, I didn't realize all the issues you guys pointed out. Turns out

  return [storyList count];

returned 0, the array had 0 items. I just set it to return 10 and then it worked. Nevertheless, thanks for pointing out the other issues, I will fix them.

Regarding your signature,

Do you know the programmer's cheer?

Shift to the left,
Shift to the right,
Push down,
Pop up,
Byte byte byte!

(More of a C/assembler programmer's cheer, really.)

 

[dejo]

Hi all, I didn't realize all the issues you guys pointed out. Turns out

  return [storyList count];

returned 0, the array had 0 items. I just set it to return 10 and then it worked.

So, you hardcoded it to return 10 even though your array contains no items? And it works? I would think you'd get a runtime error when trying to call [storyList objectAtIndex:] then.

 

[yuvraj.kale]

Hi all, please bear with me as I am new to iOS programming. I have a tableview inside one of my Viewcontrollers, but none of my tableview methods are being called. The table view is also properly linked to datasource and delegate.

For example, below I have many methods that change the size and color/contents of the tableview, but when I run the application, nothing happens. The tableview just looks like the default size/color.

Any input would be helpful.

- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath{
    //tableview cell height
    return 60;
   
   
}
- (NSInteger)tableView:(UITableView *)tableView numberOfSectionsInTableView:(NSInteger)section {
    return 1;


}

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{

    return [storyList count];
}

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
   
    static NSString *CellIdentifier = @"Cell";
   
    UITableViewCell *cell = (UITableViewCell *) [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
   
     if (cell == nil) {
     cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:CellIdentifier];
       
    }

   
    //---------- CELL BACKGROUND IMAGE -----------------------------
    UIImageView *imageView = [[UIImageView alloc] initWithFrame:cell.frame];
    UIImage *image = [UIImage imageNamed:@"LightGrey.png"];
    imageView.image = image;
    cell.backgroundView = imageView;
    [[cell textLabel] setBackgroundColor:[UIColor clearColor]];
    [[cell detailTextLabel] setBackgroundColor:[UIColor clearColor]];
   
   
    cell.textLabel.text = [storyList objectAtIndex:indexPath.row];
    cell.detailTextLabel.text = [storyListAuthor objectAtIndex:indexPath.row];
   

    return cell;
    [tableView reloadData];
}

-(void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath{
   
    DetailViewController *detail = [self.storyboard instantiateViewControllerWithIdentifier:@"detail"];
    detail.state = [datasource objectAtIndex:indexPath.row];
    detail.capital = [storyListAuthor objectForKey:detail.state];
    [self.navigationController pushViewController:detail animated:YES];
    [tableView deselectRowAtIndexPath:indexPath animated:YES];
   
}

Have you checked the height of table view before reloading the table. If your table view height is 0 then none of the method get called.

 

[PhoneyDeveloper]

It was six years ago amigo.