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3. Before attempting to call the network, you should make sure that the network is currently available on the iPhone. The SCNetworkReachability functions provided by SystemConfiguration.framework will allow you to do just that. 4. Assuming that the reachability flags indicate that the network is available, you can use NSURLConnection to create an asynchronous connection to load the data from the BART feed, as shown in Listing 7-5.

EmailClient begins by declaring several instance variables, most of which hold references to the controls. The selectedMessage variable holds a reference to the Message object represented by the selected row in the message table. The deleting instance variable is a boolean flag that tracks whether or not a message is currently being deleted from the

Finally, keep functionality in mind. Don t make your application entirely dependent on in-app purchases. Be sure to offer some value for the users who download it and choose not to purchase your products. Make sure you structure your store in such a way that it adds to your application rather than being the focus of it. In the next and final chapter, we ll discuss some of the API enhancements going forward.

In this last chapter, we ll explore some of the APIs related to custom keyboard views as well as discuss some of the new SDK features going forward. The SDK is evolving yearly, so it s almost impossible to keep up with every change that s made. The custom keyboard and keyboard accessories are simple concepts that are a good indication that Apple is loosening up its platform and giving developers greater control. The company is fostering innovation while still maintaining high quality for its devices. In addition to custom keyboard input, we ll also talk about the iPhone 4.0 SDK. The 4.0 SDK boasts new features such as multitasking, local notifications, and direct access to the media stored on the device, which will make for much more interesting and robust applications moving forward.

messages table. Finally, the session variable contains a reference to the JavaMail session established in the connect( ) method.

As you ll see as we dive in, most of the functionality we ll discuss has existed for some time in the iPhone SDK, but it s been simplified for you by Apple This is because the task of creating custom keyboard accessories is common in many applications We ll start by discussing how to implement custom keyboard accessories Custom keyboard accessories are views that are attached to the top of a keyboard These views are bound to the keyboard s animations and animate up and down as the keyboard is shown and hidden You can see an example of a keyboard accessory by looking at the Messages application on your iPhone, as shown in figure 191 Notice that when you tap inside the text box, the entire toolbar animates up as the keyboard comes into view The toolbar with the text box and but- Figure 19.

- (void)loadPredictionXML:(id<BARTPredictionLoaderDelegate>)delegate { _delegate = delegate; // Load the predictions XML from BART's web site // Make sure that bart.gov is reachable using the current connection SCNetworkReachabilityFlags flags; SCNetworkReachabilityRef reachability = SCNetworkReachabilityCreateWithName(NULL, [@"www.bart.gov" UTF8String]); SCNetworkReachabilityGetFlags(reachability, &flags); // The reachability flags are a bitwise set of flags // that contain the information about // connection availability BOOL reachable = ! (flags & kSCNetworkReachabilityFlagsConnectionRequired); NSURLConnection *conn; NSURLRequest *request = [NSURLRequest requestWithURL:[NSURL URLWithString:@"http://www.bart.gov/dev/eta/bart_eta.xml"]]; if ([NSURLConnection canHandleRequest:request] && reachable) { conn = [NSURLConnection connectionWithRequest:request delegate:self]; if (conn) { self.predictionXMLData = [NSMutableData data]; } } }