Objective C: How to create custom/static table view cells via code

Question

I am trying to create 3 table view cells using code (w/o nib). I am having some trouble getting the code to work. I guess I am not getting the approach right. Can anyone advise me on the proper way going forward? Any help on this will be greatly appreciated!

Thanks!

Zhen Hoe

My code snippet as follows:

- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView 
{
    // Return the number of sections.
    return 1;
}

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section     
{
    // Return the number of rows in the section.
    return 3;
}


// Customize the appearance of table view cells.
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath 
{
    static NSString *CellIdentifier = @"Cell";
    int row = [indexPath row];

    UITableViewCell *startCell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:CellIdentifier] autorelease];
    UITableViewCell *durationCell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:CellIdentifier] autorelease];
    UITableViewCell *radiusCell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:CellIdentifier] autorelease];

    startCell.textLabel.text = @"Start:";
    durationCell.textLabel.text = @"Duration:";
    radiusCell.textLabel.text = @"radius";


    if (row == 0)
    {
        return startCell;
    }
    else if (row == 1)
    {
        return durationCell;
    }

    return radiusCell;
}

EDIT (19/05/11)

After going through your answers, I am still unable to display any cells in my tableview. Is this due to the way I initialized my table?

//Initialization
UITableView *tv = [[UITableView alloc] initWithFrame:CGRectMake(0, 0, self.view.frame.size.width, self.settingsView.frame.size.height)
                                                style:UITableViewStyleGrouped];

self.tableView = tv;

[self.view addSubview:tableView];

After which I have an animation to expand the tableView

[UIView animateWithDuration:0.3 animations:^{

        [self.tableView setFrame:CGRectMake(0, 0, self.view.frame.size.width, self.view.frame.size.height-self.picker.frame.size.height)];
}];

Do you guys see any issues with the above? Anything that is causing my display of cells fail?

Thanks!

Zhen

While not exactly the right way, this should work. Can you tell how it is failing? — Deepak Danduprolu
– Deepak Danduprolu, Commented May 18, 2011 at 19:06
Hi, I am not getting any displays on my tableview. I have included my initialization code. Do you see any issues? Thanks! — Zhen
– Zhen, Commented May 18, 2011 at 19:19

octy · Accepted Answer · 2011-05-18 19:35:08Z

In your UITableView initialization code, I don't see where you set the table view delegate and dataSource. That is certainly part of the problem. As per Apple's documentation:

A UITableView object must have an object that acts as a data source and an object that acts as a delegate; typically these objects are either the application delegate or, more frequently, a custom UITableViewController object. The data source must adopt the UITableViewDataSource protocol and the delegate must adopt the UITableViewDelegate protocol. The data source provides information that UITableView needs to construct tables and manages the data model when rows of a table are inserted, deleted, or reordered. The delegate provides the cells used by tables and performs other tasks, such as managing accessory views and selections.

This is what you can try to do:

//Initialization
UITableView *tv = [[UITableView alloc] initWithFrame:CGRectMake(0, 0, self.view.frame.size.width, self.settingsView.frame.size.height)
                                                style:UITableViewStyleGrouped];

// assuming that your controller adopts the UITableViewDelegate and
// UITableViewDataSource protocols, add the following 2 lines:

tv.delegate = self;
tv.dataSource = self;


self.tableView = tv;

[self.view addSubview:tableView];

albertamg · Accepted Answer · 2011-05-18 19:04:59Z

2

Do not create more than one cell at a time and make use of the reuse mechanism via dequeueReusableCellWithIdentifier:. You can configure the cells (feed data from model, etc.) based on their index path.

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

    static NSString *CellIdentifier = @"Cell";

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

    // configure cell...
    switch(indexPath.row) { // assuming there is only one section
        case 0:
            cell.textLabel.text = @"Start:";
            break;
        case 1:
            cell.textLabel.text = @"Duration:";
            break;
        case 2:
            cell.textLabel.text = @"radius";
            break;
        default:
            break;
    }

    return cell;
}

answered May 18, 2011 at 19:04

albertamg

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1 Comment

Zhen Over a year ago

Hi, thanks for the response. I have edited my question to include the way I initialized the table view. Not sure if there are any issues there. Great if you can give me advise on this. Thanks!

Tejas · Accepted Answer · 2011-05-18 19:06:45Z

1

The tableView: cellForRowAtIndexPath: method is called once per row in your table view. You don't need to create 3 cells each time. Create one cell for each invocation of this method, and return it. Something like this -

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

}


    switch (row) {
        case 1:{
            cell.textLabel.text = @"Start";
            break;
        }
        case 2:{
            cell.textLabel.text = @"Duration";
            break;
        }

        default:
            cell.textLabel.text = @"radius";
            break;
    }
    return cell;
}

answered May 18, 2011 at 19:06

Tejas

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2 Comments

Zhen Over a year ago

Hi, I followed your code but am still not able to get the display. I have updated my question to include the way I initialized and animate the table View. Do you see any issues there?

Tejas Over a year ago

Have you tried what some others (@octy and @Deepak) suggested? You're probably not setting the delegate / datasource. Did you put a breakpoint in this code to see if it is hit?

Deepak Danduprolu · Accepted Answer · 2011-05-18 19:26:30Z

1

You should do self.view = self.tableView;. In a UITableViewController, they are the same. And did you set the datasource and delegate?

answered May 18, 2011 at 19:26

Deepak Danduprolu

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