in-app purchase methods(mkstorekit? ) - objective-c

Question

I have an app at the appstore , and i would like to add it in-app purchase, a basic one ,in order to purchase more levels .
I know that the apple sdk is very hard to implement,
I know the mkstorekit is an easy one, but i cant find a guide from scratch to use it .
Whats the best way to do so, any other method ?any good tutorial ?
Thanks a lot.

Answer 1

First you need to initialize MKStoreKit. A sample initializiation code that you can add to your application:didFinishLaunchingWithOptions: is below In Objective-C
[[MKStoreKit sharedKit] startProductRequest];
[[NSNotificationCenter defaultCenter] addObserverForName:kMKStoreKitProductsAvailableNotification
object:nil
queue:[[NSOperationQueue alloc] init]
usingBlock:^(NSNotification *note) {
NSLog(#"Products available: %#", [[MKStoreKit sharedKit] availableProducts]);
}];
[[NSNotificationCenter defaultCenter] addObserverForName:kMKStoreKitProductPurchasedNotification
object:nil
queue:[[NSOperationQueue alloc] init]
usingBlock:^(NSNotification *note) {
NSLog(#"Purchased/Subscribed to product with id: %#", [note object]);
}];
[[NSNotificationCenter defaultCenter] addObserverForName:kMKStoreKitRestoredPurchasesNotification
object:nil
queue:[[NSOperationQueue alloc] init]
usingBlock:^(NSNotification *note) {
NSLog(#"Restored Purchases");
}];
[[NSNotificationCenter defaultCenter] addObserverForName:kMKStoreKitRestoringPurchasesFailedNotification
object:nil
queue:[[NSOperationQueue alloc] init]
usingBlock:^(NSNotification *note) {
NSLog(#"Failed restoring purchases with error: %#", [note object]);
}];
You can check if a product was previously purchased using -isProductPurchased as shown below.
if([MKStoreManager isProductPurchased:productIdentifier]) {
//unlock it
}
You can check for a product's expiry date using -expiryDateForProduct as shown below.
if([MKStoreManager expiryDateForProduct:productIdentifier]) {
//unlock it
}
To purchase a feature or to subscribe to a auto-renewing subscription, just call
[[MKStoreKit sharedKit] initiatePaymentRequestForProductWithIdentifier:productIdentifier];
You can also find tutorials of mkstorekit here and here.