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PredictionTableViewController *predictionController;

#import "RootViewController.h" #import "WallpaperViewController.h" @implementation RootViewController @synthesize transactionHistory; - (void)viewDidLoad { [super viewDidLoad];

try { if(amountStr.length() != 0 && periodStr.length() != 0 && rateStr.length() != 0) {

[[SKPaymentQueue defaultQueue] addTransactionObserver:self];1 products = [[NSMutableArray alloc] init];

Recall that the user must enter the original loan amount, the number of years for the loan, and the interest rate. If all three text fields contain information, then the length of each string will be greater than zero. If the user has entered all the loan data, then the numeric values corresponding to those strings are obtained and stored in the appropriate instance variable. Next, compute( ) is called to compute the loan payment, and the result is displayed in the read-only text field referred to by paymentText, as shown here:

NSArray *paths = NSSearchPathForDirectoriesInDomains (NSDocumentDirectory, NSUserDomainMask, YES); NSString *documentsDirectory = [paths objectAtIndex:0]; NSString * path = [documentsDirectory stringByAppendingPathComponent: @"history.plist"]; self.transactionHistory = [NSMutableArray arrayWithContentsOfFile: path];

24. Set up the property for this new instance variable, but this time, add a reference to IBOutlet in front of the type in the property declaration. This tells Interface Builder that you want the ability to connect an object in Interface Builder with this property. Don t forget to also synthesize the property in RootViewController.m.

if(!transactionHistory) { NSMutableArray *_transactionHistory = [[NSMutableArray alloc] init]; self.transactionHistory = _transactionHistory; [_transactionHistory release]; } [self requestProductData]; }

principal = Double.parseDouble(amountStr); numYears = Double.parseDouble(periodStr); intRate = Double.parseDouble(rateStr) / 100;

The first thing you may notice is you import a file called WallpaperViewController.h. Don t worry about it at the moment; you ll create it later in the section. You add the class as the transaction observer B. This means the class implements the SKPaymentTransactionObserver protocol as well as the delegate methods. The methods that must be implemented for this protocol are completeTransaction, restoreTransaction, and failedTransaction. These methods are called in response to various actions received from the Store Kit framework.

result = compute(); paymentText.setText(nf.format(result));

Next, you retrieve the transaction history. Whenever transactions are made, it s a good idea to store them somewhere in your application or on a server. You store the products that are purchased in a simple plist file and attempt to load the plist file into memory C. If no history exists, this array is initialized to be empty. The last line in the code starts the process of retrieving your products from Apple. Although you don t do it here, it s a good idea to display a loading message to the user at this point while they wait for the product list to download. Listing 18.3 shows the code for this method.

@property (nonatomic,retain) IBOutlet PredictionTableViewController *predictionController;

- (void) requestProductData { SKProductsRequest *request= [[SKProductsRequest alloc] initWithProductIdentifiers:[NSSet setWithObjects: @"com.rightsprite.wallpaper.01", @"com.rightsprite.wallpaper.02", @"com.rightsprite.wallpaper.03",nil]]; request.delegate = self; [request start]; } - (void)productsRequest:(SKProductsRequest *)request didReceiveResponse:(SKProductsResponse *)response{ NSArray *myProducts = response.products; for(SKProduct * product in myProducts) { [products addObject:product]; } [request autorelease]; [self.tableView reloadData]; }

If the user has entered a nonnumeric value into one of the text fields, then Double.parseDouble( ) will throw a NumberFormatException. If this happens, an error message will be displayed on the status line and the Payment text field will be emptied, as shown here: