In this lesson you’ll build the Welcome app. You’ll learn how to work in Xcode, Apple’s Integrated Development Environment (IDE), and how to use Interface Builder to create this simple iPhone app by dragging and dropping predefined building blocks.

In this lesson you’ll build the Tip Calculator app. This app uses various object-oriented Objective-C features including class declarations (known as interfaces in Objective-C), class implementations and inheritance. You’ll also learn basic Objective-C keywords and syntax as you write the code that responds to user interactions and programmatically updates the GUI.

In this lesson you’ll build the Favorite Twitter Searches app, which allows users to save their favorite (possibly lengthy) Twitter search strings. You will learn to use three new GUI components–View, Scroll View and Button. A View provides the fundamental capabilities of many other GUI components. Buttons are types of Controls. A Control is a type of View, so Buttons are also Views. Such components respond to touches, display complicated graphics and perform 3D animations.

In this lesson you’ll learn to build The Flag Quiz Game app, which tests the user’s ability to correctly identify flags from around the world. You will learn to use the Utility Application template, which defines an app with frontside and flipside views. In addition, you will learn to use Cocoa’s memory management capabilities.

In this lesson you’ll build the Spot-On Game app, which tests a user’s reflexes by requiring them to touch moving spots before they disappear. You will learn to use the SpotOnViewController to process multi-touch events, the Core Animation framework to animate the spots, and the AVFoundation framework to add sounds to the app.

In this lesson you’ll build the Cannon Game app, which challenges the player to destroy a seven-piece target before a ten-second time limit runs out. You will learn to manually perform animations by responding to NSTimer events that occur at fixed time intervals. You also learn to use structures in our programs; and how to draw lines, draw text, change line thicknesses, and change colors using the Core Graphics framework.

In this lesson you’ll build the Painter app, which turns the iPhone screen into a virtual painter’s canvas. You will learn to combine custom views with Cocoa GUI components to create a richer app, process multiple screen touches, detect when touches move and leave the screen, detect motion events to clear the screen when the user shakes the iPhone, and add variables of primitive and struct types to collections.

In this lesson you’ll build the Address Book app, which provides quick and easy access to stored contact information. You will learn to use the UITableView, the standard table for iPhone apps; to use the Navigation-based Application template to switch between Views using a Navigation Controller; and to add Buttons to a UINavigationItem so that one navigation bar can handle transitions between multiple Views.

In this lesson you’ll build the Route Tracker app, which monitors the user’s location and heading–visually displaying a route on a map. You will learn to use the Map Kit framework’s MKMapView class to rotate, zoom, and draw to the map.

In this lesson you’ll build the Slideshow app, which allows the user to create and manage slideshows using pictures and music from the iPhone photo album and iPod library. You will learn to use a UIImagePickerController to allow the user to add pictures from the iPhone’s photo library, use an MPMediaPickerController to allow the user to add music from the iPod library, use a UIActionSheet to allow the user to choose how slideshow images transition from one to the next, and use an MPMusicPlayerController to play music during the slideshow.

In this lesson you’ll build the Enhanced Slideshow app, which adds video capabilities to the SlideShow app you built in Lesson 10, and allow the user to save slideshows. You will learn to use an MPMoviePlayerController to play videos from the iPhone’s photo library, a UIImagePickerController to allow the user to chose images and videos from the photo library, an NSCoder to serialize and deserialize objects, use an NSKeyedArchiver to serialize all saved slideshows to memory so the app can reload the slideshows the next time it executes, and use the app’s delegate class to save data when the app closes.

In this lesson you’ll build the Voice Recorder app, which allows the user to record sounds using the iPhone’s microphone. You will learn to record audio files using an AVAudioRecorder and the AV Foundation framework, verify text input using an NSPredicate object and a regular expression, use metering to create a visual representation of the user’s audio input, and create an NSData object representing an audio file and use an MFMailComposeViewController to send an e-mail with the recording attached.

n this lesson you’ll build the, Enhanced Address Book app, which is an enhanced version of the Address Book app created in Lesson 8. This version allows the user to transfer contacts between iPhones using Bluetooth technology. You will learn to use the Core Data framework to graphically define the app’s data model in a manner similar to building GUIs in Interface Builder, and the Game Kit framework to allow multiple iPhones to interact via Bluetooth.

In this lesson you will build the Twitter® Discount Airfares app, which uses Twitter web services to discover discount airfares from jetBlue. You will learn to construct a Twitter URL and pass it to the NSURLConnection, which handles the networking issues; parse the response using the class NSXMLParser; and store the parsed data in an NSMutableArray and display it in a UITableView with custom UITableViewCells.