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Tutorial: Add Data
Add New Items
3.
In the method, see whether the Done button was tapped.
If it wasn’t, instead of saving the item, you want the method to return without doing anything else.
if (sender != self.doneButton) return;
4.
See whether there’s text in the text field.
if (self.textField.text.length > 0) {
}
5.
If there’s text, create a new item and give it the name of the text in the text field. Also, ensure that the
completed state is set to NO.
self.toDoItem = [[XYZToDoItem alloc] init];
self.toDoItem.itemName = self.textField.text;
self.toDoItem.completed = NO;
If there isn’t text, you don’t want to save the item, so you won’t do anything else.
Your prepareForSegue: method should look like this:
- (void) prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
{
if (sender != self.doneButton) return;
if (self.textField.text.length > 0) {
self.toDoItem = [[XYZToDoItem alloc] init];
self.toDoItem.itemName = self.textField.text;
self.toDoItem.completed = NO;
}
}
Now that you’ve created a new item, you need to pass the item back to XYZToDoListViewController so
that it can add the item to the to-do list. To accomplish this, you need to revisit the unwindToList: method
that you wrote in the second tutorial. This method gets called when the XYZAddToDoItemViewController
scene closes, which happens when the user taps either the Cancel or the Done button.
2013-10-22 | Copyright © 2013 Apple Inc. All Rights Reserved.
109
Tutorial: Add Data
Add New Items
The unwindToList: method takes a segue as a parameter, like all methods that are used as targets for an
unwind segue. The segue parameter is the segue that unwinds from XYZAddToDoItemViewController
back to XYZToDoListViewController. Because a segue is a transition between two view controllers, it is
aware of its source view controller—XYZAddToDoItemViewController. By asking the segue object for its
source view controller, you can access any data stored in the source view controller in the unwindToList:
method. In this case, you want to access toDoItem. If it’s nil, the item was never created—either the text
field had no text or the user tapped the Cancel button. If there’s a value for toDoItem, you retrieve the item,
add it to your toDoItems array, and display it in the to-do list by reloading the data in the table view.
To store and display the new item
1.
In the project navigator, select XYZToDoListViewController.m.
2. Add an import declaration to the XYZAddToDoItemViewController class above the @interface line.
#import "XYZAddToDoItemViewController.h"
3.
4.
Find the unwindToList: method you added in the second tutorial.
In this method, retrieve the source view controller—the controller you’re unwinding from,
XYZAddToDoItemViewController.
XYZAddToDoItemViewController *source = [segue sourceViewController];
5.
Retrieve the controller’s to-do item.