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Now is a good time to become familiar with the way that the project template has set up this primary user interface file. The navigation controller provided for us by default has a navigation bar and an instance of RootViewController, the top-level class that was automatically generated for you when you created the project and that currently contains the table view that displays the list of stations.

You ve now seen how easy it is to integrate fully functional maps into any application. The Map Kit framework is powerful but simple to use. To add a map to any application, drag and drop it onto your view in Interface Builder and connect it using an IBOutlet. This gives you complete control Figure 17.6 MKMapView with over the look, feel, and behavior of the map. custom annotations If you require additional data to be added to the map, the Map Kit framework provides a great mechanism for adding annotations. These can either be the built-in pins or completely customized to suit your application s needs. In the next chapter, we ll discuss the Store Kit framework and how to integrate it with your applications. It s one of the most complex to use, but it can prove to be the most profitable. You ll use it to support in-app purchases.

The getValueAt( ) method, shown next, is called to get the current value to display for each of the table s cells:

This chapter will be structured a little differently than ones prior. Rather than going over the Store Kit API, we ll demonstrate the topics for creating an in-app store by walking through a basic example. We ll look at how to set up a sandbox testing environment (to mimic selling actual items) and work through how to build the store interface. The Store Kit API allows you to sell various items within your application. The items sold are called products. These products may be virtual goods, services, or even subscriptions. All transactions are processed securely through iTunes without the user ever having to enter their payment information on the device. There are countless ways to add a store to your application, and how you do so depends entirely on your needs. In this chapter, we ll discuss one of those ways and give you the tools to implement your own store.

// Get value for a specific row and column combination. public Object getValueAt(int row, int col) { try { Message message = (Message) messageList.get(row); switch (col) { case 0: // Sender Address[] senders = message.getFrom(); if (senders != null || senders.length > 0) { return senders[0].toString(); } else { return "[none]"; } case 1: // Subject String subject = message.getSubject(); if (subject != null && subject.length() > 0) { return subject; } else { return "[none]"; } case 2: // Date Date date = message.getSentDate(); if (date != null) { return date.toString(); } else { return "[none]"; }

The example store you ll be creating will let users purchase iPhone backgrounds on their phone. Users will browse through the available products and purchase the ones they want to keep. When a background has been purchased, it will be saved to the user s camera roll so the user can use it on their device.

18. Underneath Root View Controller is an instance of UINavigationItem, which contains information about how this view controller fits into our navigation hierarchy. Let s see the information for our root controller by expanding the controller and clicking the navigation item. Then, in Interface Builder, choose Tools Inspector. When the Inspector window pops up, choose the first tab, called Attributes, as shown in Figure 7-14.