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Vikhr models 146

To connect the text field to your view controller

1.

In the outline view, select the XYZAddToDoItemViewController object.

2. Click the Assistant button in the upper right of the window’s toolbar to open the assistant editor.

The editor on the right should appear with XYZAddToDoItemViewController.m displayed. If it isn’t

displayed, click the filename in the editor on the right and choose XYZAddToDoItemViewController.m.

The assistant editor allows you to have two files open at once, making it possible to perform operations

between them—for example, tying a property in your source file with an object in your interface.

3.

Select the text field in your storyboard.

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

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Tutorial: Add Data

Add New Items

4. Control-drag from the text field on your canvas to the code display in the editor on the right, stopping

the drag at the line just below the @interface line in XYZAddToDoItemViewController.m.

5.

In the dialog that appears, for Name, type textField.

Leave the rest of the options as they are. Your dialog should look like this:

6. Click Connect.

Xcode adds the necessary code to XYZAddToDoItemViewController.m to store a pointer to the text

field and configures the storyboard to set up that connection.

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

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Tutorial: Add Data

Add New Items

Additionally, you need to know when to create the item. You want to create the item only if the Done button

was tapped. To do this, add the Done button as an outlet.

To connect the Done button to your view controller

1.

2.

3.

In your storyboard, open the assistant editor, and set the rightmost window to

XYZAddToDoItemViewController.m.

Select the Done button in your storyboard.

Control-drag from the Done button on your canvas to the code display in the editor on the right, stopping

the drag at the line just below your textField property in XYZAddToDoItemViewController.m.

4.

In the dialog that appears, for Name, type doneButton.

Leave the rest of the options as they are. Your dialog should look like this:

5.

Click Connect.

You now have a way to identify the Done button. Because you want to create an item when the Done button

is tapped, you need to know when that happens.

When the user taps the Done button, it kicks off an unwind segue back to the to-do list—that’s the interface

you configured in the second tutorial. Before a segue executes, the system gives the view controller involved

a chance to prepare by calling prepareForSegue:. This is exactly the point at which you want to check to

see whether the user tapped the Done button, and if so, create a new to-do item. You can check which one

of the buttons got tapped, and if it was the Done button, create the item.

To create an item after tapping the Done button

1.

Select XYZAddToDoItemViewController.m in the project navigator.

2. Add the prepareForSegue: method below the @implementation line:

- (void) prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender

{

}

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