how to print barcode in vb.net 2008 Creating a simple store interface in Objective-C

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18.2 Creating a simple store interface
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Generally, you ll add a store to an existing application to improve functionality. This is why, for this example, you ll create a basic store without any additional bells and whistles. It will use the Navigation-Based Application template and display a list of products in a UITableView. Check out figure 18.9 for an idea of what the application will look like. To get started, open Xcode and create a new navigation-based project. Name the project WPStore. Then, add the Store Kit framework to your project by right-clicking Frameworks and selecting Existing Framework from the menu that displays. Now, you need to declare the class properties and methods that will be used in the application. Open RootViewController.h, and add the code in listing 18.1.
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Listing 18.1 RootViewConroller.h
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Figure 18.9 The wallpaper store interface as shown on the iPhone
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#import <StoreKit/StoreKit.h> @interface RootViewController : UITableViewController <SKProductsRequestDelegate,SKPaymentTransactionObserver> { NSMutableArray * products; NSMutableArray * transactionHistory; } @property (nonatomic, retain) NSMutableArray * transactionHistory; (void) (void) (void) (void) (void) (void) requestProductData; completeTransaction: (SKPaymentTransaction *)transaction; restoreTransaction: (SKPaymentTransaction *)transaction; failedTransaction: (SKPaymentTransaction *)transaction; recordTransaction:(SKPaymentTransaction * )transaction; provideContent:(NSString * )productIdentifier;
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@end
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The first thing you see here is that the class imports the Store Kit header file. This gives you access to all the objects and properties needed for the application to implement a
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In-app purchasing using Store Kit
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store. Following that, the class signature states that the class implements the SKProductRequestDelegate and SKPaymentTransactionObserver protocols. We ll explain what each of these does further on in this section. The class has two properties. The first is an NSMutableArray of products. This is the product array that populates the UITableView. The other property stores transaction history when a user purchases items. The last bit of code declares the methods you re using in the class. We ll explain these methods in detail when you implement them in this section. Now that you ve created the header file, you re ready to implement the initialization method. Open RootViewController.m, and add the code in listing 18.2 to the viewDidLoad method.
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Listing 18.2
viewDidLoad method of RootViewController.m
#import "RootViewController.h" #import "WallpaperViewController.h" @implementation RootViewController @synthesize transactionHistory; - (void)viewDidLoad { [super viewDidLoad];
Sets payment observer to class
[[SKPaymentQueue defaultQueue] addTransactionObserver:self];1 products = [[NSMutableArray alloc] init];
Initializes products array
NSArray *paths = NSSearchPathForDirectoriesInDomains (NSDocumentDirectory, NSUserDomainMask, YES); NSString *documentsDirectory = [paths objectAtIndex:0]; NSString * path = [documentsDirectory stringByAppendingPathComponent: @"history.plist"]; self.transactionHistory = [NSMutableArray arrayWithContentsOfFile: path];
Initializes transaction history
Builds path to transaction history file
if(!transactionHistory) { NSMutableArray *_transactionHistory = [[NSMutableArray alloc] init]; self.transactionHistory = _transactionHistory; [_transactionHistory release]; } [self requestProductData]; }
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.
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Creating a simple store interface
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.
Listing 18.3 Requesting product information
- (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]; }
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.
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