UITableView dequeueReusableCellWithIdentifier forIndexPath example in Objective C (iOS).

UITableView dequeueReusableCellWithIdentifier forIndexPath

Returns a reusable table-view cell object for the specified reuse identifier.

- (id)dequeueReusableCellWithIdentifier:(NSString *)identifier forIndexPath:(NSIndexPath *)indexPath

Parameters of [UITableView dequeueReusableCellWithIdentifier forIndexPath]
identifier
A string identifying the cell object to be reused. This parameter must not be nil.
indexPath
The index path specifying the location of the cell. The data source receives this information when it is asked for the cell and should just pass it along. This method uses the index path to perform additional configuration based on the cell’s position in the table view.

Return Value of [UITableView dequeueReusableCellWithIdentifier forIndexPath]
A UITableViewCell object with the associated reuse identifier. This method always returns a valid cell.

Discussion of [UITableView dequeueReusableCellWithIdentifier forIndexPath]
For performance reasons, a table view'€™s data source should generally reuse UITableViewCell objects when it assigns cells to rows in its tableView:cellForRowAtIndexPath: method. A table view maintains a queue or list of UITableViewCell objects that the data source has marked for reuse. Call this method from your data source object when asked to provide a new cell for the table view. This method dequeues an existing cell if one is available or creates a new one based on the class or nib file you previously registered.[UITableView dequeueReusableCellWithIdentifier forIndexPath]

Important: You must register a class or nib file using the registerNib:forCellReuseIdentifier: or registerClass:forCellReuseIdentifier: method before calling this method.
If you registered a class for the specified identifier and a new cell must be created, this method initializes the cell by calling its initWithStyle:reuseIdentifier: method. For nib-based cells, this method loads the cell object from the provided nib file. If an existing cell was available for reuse, this method calls the cell’s prepareForReuse method instead.

UITableView dequeueReusableCellWithIdentifier forIndexPath example.

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    static NSString *CellIdentifier = @"MyCell";

    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier forIndexPath:indexPath]; /// SIGABRT error

    if (!cell)
    {
        cell = [[UITableViewCell alloc]
        initWithStyle: UITableViewCellStyleSubtitle
        reuseIdentifier: CellIdentifier];
    }

    return cell;
}

Example of [UITableView dequeueReusableCellWithIdentifier forIndexPath].

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    static NSString *cellIdentifier = @"cell_identifier";

    [tableView registerClass:[UITableViewCell class] forCellReuseIdentifier:cellIdentifier];

    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:cellIdentifier forIndexPath:indexPath];

    return cell;
}

UITableView dequeueReusableCellWithIdentifier forIndexPath example.

- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
   {
    NSLog(@"Sections in table");
    // Return the number of sections.
    return 1;
   }

   - (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
  {
    NSLog(@"Rows in table");

    // Return the number of rows in the section.
    return myArray.count;
   }

   - (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath    *)indexPath
    {
    static NSString *CellIdentifier = @"Cell";
    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier forIndexPath:indexPath];

    NSString *myValue;

    //This is just some test array I created:
    myValue=[myArray objectAtIndex:indexPath.row];

    cell.textLabel.text=myValue;
    UIFont *myFont = [ UIFont fontWithName: @"Arial" size: 12.0 ];
    cell.textLabel.font  = myFont;

    return cell;
   }

End of UITableView dequeueReusableCellWithIdentifier forIndexPath example article.