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Vikhr models 146

text label to the item’s name.

To display cells in your table

1.

In the project navigator, select XYZToDoListViewController.m.

2013-10-22 | Copyright © 2013 Apple Inc. All Rights Reserved.

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Tutorial: Add Data

Display the Data

2.

Find the tableView:cellForRowAtIndexPath: data source method. The template implementation

looks like this:

- (UITableViewCell *)tableView:(UITableView *)tableView

cellForRowAtIndexPath:(NSIndexPath *)indexPath

{

static NSString *CellIdentifier = @"Cell";

UITableViewCell *cell = [tableView

dequeueReusableCellWithIdentifier:CellIdentifier forIndexPath:indexPath];

// Configure the cell...

return cell;

}

The template performs several tasks. It creates a variable to hold the identifier for the cell, asks the table

view for a cell with that identifier, adds a comment about where code to configure the cell should go, and

then returns the cell.

To make this code work for your app, you’ll need to change the identifier to the one you set in the

storyboard and then add code to configure the cell.

3.

Change the cell identifier to the one you set in the storyboard. To avoid typos, copy and paste from the

storyboard to the implementation file. The cell identifier line should now look like this:

static NSString *CellIdentifier = @"ListPrototypeCell";

4.

Just before the return statement, add the following lines of code:

XYZToDoItem *toDoItem = [self.toDoItems objectAtIndex:indexPath.row];

cell.textLabel.text = toDoItem.itemName;

Your tableView:cellForRowAtIndexPath: method should look like this:

- (UITableViewCell *)tableView:(UITableView *)tableView

cellForRowAtIndexPath:(NSIndexPath *)indexPath

{

static NSString *CellIdentifier = @"ListPrototypeCell";

2013-10-22 | Copyright © 2013 Apple Inc. All Rights Reserved.

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Tutorial: Add Data

Mark Items as Completed

UITableViewCell *cell = [tableView

dequeueReusableCellWithIdentifier:CellIdentifier forIndexPath:indexPath];

XYZToDoItem *toDoItem = [self.toDoItems objectAtIndex:indexPath.row];

cell.textLabel.text = toDoItem.itemName;

return cell;

}

Checkpoint: Run your app. The list of items you added in loadInitialData should show up as cells in your

table view.

Mark Items as Completed

A to-do list isn’t much good if you can never mark items as completed. Now, you’ll add support for that. A

simple interface would be to have the completion state toggle when the user taps the cell and to display

completed items with a checkmark next to them. Fortunately, table views come with some built-in behavior

that you can take advantage of to implement this simple interface—specifically, table views notify their delegate

when the user taps a cell. So the task is to write the code that will respond to the user tapping a to-do item in

the table.

Xcode already made XYZToDoListViewController the delegate of the table view when you configured it

in the storyboard. All you have to do is implement the tableView:didSelectRowAtIndexPath: delegate