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You start by creating the product request. Notice that these are the product IDs you registered in section 18.1.2. You re basically asking iTunes for information about the products with these identifiers. If you wanted to make your application a little more dynamic, you could load the identifier list from a server. We won t go into detail about that because it s out of the scope of this book. After the request has been created, the code starts the process of retrieving the product information from iTunes. When the information has been retrieved, the delegate method didReceiveResponse is called with the data. You loop over the products and add them to the global products array. That way, you can populate the UITableView with their names and descriptions. Finally, you reload the UITableView with the product data. The last thing you need to do to see the product list is to implement the delegate methods for the UITableView. Add the code from listing 18.4 to your RootViewController.

showStatus(""); // erase any previous error message } catch (NumberFormatException exc) { showStatus("Invalid Data"); paymentText.setText(""); }

25. Save your changes, switch back to Interface Builder, and click the Root View Controller to select it. In the Inspector window, choose the second tab, called Connections. You ll see that there is now an outlet to your predictionController instance. Connect that outlet to your Prediction Table View Controller by dragging the circle from the outlet to the controller in the document window, as shown in Figure 7-18.

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section { return [products count]; } - (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath { static NSString *CellIdentifier = @"Cell"; UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier]; if (cell == nil) { cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:CellIdentifier] autorelease]; } SKProduct * product = [products objectAtIndex:indexPath.row]; cell.textLabel.text = [NSString stringWithFormat:@"$%.2f %@", product.price.doubleValue, product.localizedTitle]; cell.detailTextLabel.text = product.localizedDescription; cell.accessoryType = UITableViewCellAccessoryDisclosureIndicator; return cell; }

The calculation of the loan payment takes place in compute( ). It implements the formula shown earlier and operates on the values in principal, intRate, numYears, and payPerYear. It returns the result.

This code is straightforward: you ve already seen how to populate a UITableView from an NSArray. Note that you populate the cell s text label and detail text label from the localized product information. At this point, you should be able to see your list of products when you run the application. If you intend to test now, make sure you comment out the line to import WallpaperViewController.h, because you haven t yet created it. The next step is to display the wallpapers to the user when they tap on a row in the table. This will allow them to see the wallpaper as well as purchase it. Before you create the view controller you ll use, let s implement the didSelectRowAtIndexPath method of the UITableView to push the new view onto the navigation stack. Listing 18.5 details this code.

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath { SKProduct * product = [products objectAtIndex:indexPath.row]; WallpaperViewController * wpViewController = [[WallpaperViewController alloc] initWithNibName:@"WallpaperViewController" bundle: [NSBundle mainBundle]]; wpViewController.product = product; [self.navigationController pushViewController:wpViewController

26. Now that your root view controller has access to the new prediction controller that we created, you can set up the root controller to reveal the predictions table when you tap on a station name. Table view controllers have a delegate method called didSelectRowAtIndexPath that you can implement that will be called whenever you select an item in the table view. We will implement this method to tell our application to push the prediction controller onto the view stack when you tap a selection:

Another popular financial calculation finds the future value of an investment given the initial investment, the rate of return, the number of compounding periods per year, and the number of years the investment is held. For example, you might want to know what your retirement account will be worth in 12 years if it currently contains $98,000 and has an average annual rate of return of 6 percent. The FutVal applet developed here will supply the answer. To compute the future value, use the following formula: Future Value = principal * ((rateOfRet / compPerYear) + 1)

animated:YES]; [wpViewController release]; }

where rateOfRet specifies the rate of return, principal contains the initial value of the investment, compPerYear specifies the number of compounding periods per year, and numYears specifies the length of the investment in years. If you use an annualized rate of return for rateOfRet, then the number of compounding periods is 1. The following applet called FutVal uses the preceding formula to compute the future value of an investment. The applet produced by this program is shown in Figure 9-2.