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XYZToDoItem *item = source.toDoItem; |
This is the item that was created when the Done button was tapped. |
6. |
See whether the item exists. |
if (item != nil) { |
} |
If it’s nil, either the Cancel button closed the screen or the text field had no text, so you don’t want to |
save the item. |
If it does exist, add the item to your toDoItems array. |
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110 |
Tutorial: Add Data |
Recap |
[self.toDoItems addObject:item]; |
7. |
Reload the data in your table. |
Because the table view doesn’t keep track of its data, it’s the responsibility of the data source—in this |
case, your table view controller—to notify the table view when there’s new data for it to display. |
[self.tableView reloadData]; |
Your unwindToList: method should look like this: |
- (IBAction)unwindToList:(UIStoryboardSegue *)segue |
{ |
XYZAddToDoItemViewController *source = [segue sourceViewController]; |
XYZToDoItem *item = source.toDoItem; |
if (item != nil) { |
[self.toDoItems addObject:item]; |
[self.tableView reloadData]; |
} |
} |
Checkpoint: Run your app. Now when you click the Add button (+) and create a new item, you should see it |
in your to-do list. Congratulations! You’ve created an app that takes input from the user, stores it in an object, |
and passes that object between two view controllers. This is the foundation of moving data between scenes |
in a storyboard-based app. |
Recap |
You’re almost done with this introductory tour of developing apps for iOS. The final section gives you more |
information about how to find your way around the documentation, and it suggests some next steps you |
might take as you learn how to create more advanced apps. |
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111 |
Next Steps |
● |
● |
● |
“iOS Technologies” (page 113) |
“Finding Information” (page 116) |
“Where to Go from Here” (page 128) |
2013-10-22 | Copyright © 2013 Apple Inc. All Rights Reserved. |
112 |
iOS Technologies |
You’ve just learned how to write an app with a simple user interface and basic behavior. At this point, you may |
be thinking about implementing additional behavior that will turn your project into a full-featured app. |
As you consider which features you want to add, remember that you don’t have to implement everything from |
scratch. iOS provides frameworks that define particular sets of functionality—from gaming and media to |
security and data management—which you can integrate into your app. You’ve already used the UIKit framework |
to design your app’s user interface, and the Foundation framework to incorporate common data structures |
and behavior into your code. These are two of the most common frameworks used in iOS app development, |
but there are many more available to you. |
This chapter is a high-level overview of technologies and frameworks that you might consider adopting in |