[汇文教育]iOS内支付（IAP）研究

关于iOS内支付（简称IAP，全称In App Purchase）的demo可以从以下链接下载：点击打开链接

一、实现支付功能的前提条件：

1.有一个可以发布产品的开发者账号，有一个可以运行应用的开发环境，IAP只能真机测试。

2.自己开发的IAP内支付APP的支付功能实现是需要有Product ID才能实现的，Product ID就是你要购买的产品的标识，可以由以下途径获得：登陆到iTunes Connect，用申请开发者账号的APP ID创建一个新的应用，创建应用内付费项目，设置好价格和Product ID等等。主要是要记住你自己设置好的所有Product ID。

二、iOS内支付开发步骤：

拿以上demo作为实例，其运行成功出现的界面有以下两个按钮：

如果Product ID是错误的话，上面第一个Buy按钮的buyButton.enabled属性为NO。只有当Product ID提供正确，其属性改为YES，才能点击进行购买操作。

此demo的主要流程如下：

1.先在工程导入storekit.frame框架，在EBPurchase.h里#import<StoreKit/StoreKit.h>

2.在ViewController.m文件里将"Your.IAP.Product.ID"改成你自己在上面创建应用时设置好的一个Product ID

#define SUB_PRODUCT_ID @"Your.IAP.Product.ID"

3.在Product ID成功的前提下进行讲解：

1）程序运行后到ViewController.m以下方法：

-(void) viewWillAppear:(BOOL)animated
{   buyButton.enabled = NO; // Only enable after populated with IAP price.// Request In-App Purchase product info and availability.if (![demoPurchase requestProduct:SUB_PRODUCT_ID]) {// Returned NO, so notify user that In-App Purchase is Disabled in their Settings.[buyButton setTitle:@"Purchase Disabled in Settings" forState:UIControlStateNormal];}
}

从此方法buyButton.enabled = NO能看出一开始上面界面的第一个按钮是不能点击的。

2）在以上方法的 [demoPurchase requestProduct:SUB_PRODUCT_ID] 方法将Product ID传进程序，并跳转到EBPurchase.m以下方法:

-(bool) requestProduct:(NSString*)productId
{if (productId != nil) {NSLog(@"EBPurchase requestProduct: %@", productId);if ([SKPaymentQueue canMakePayments]) {// Yes, In-App Purchase is enabled on this device.// Proceed to fetch available In-App Purchase items.// Initiate a product request of the Product ID.SKProductsRequest *prodRequest = [[SKProductsRequest alloc] initWithProductIdentifiers:[NSSet setWithObject:productId]];prodRequest.delegate = self;[prodRequest start];[prodRequest release];return YES;} else {// Notify user that In-App Purchase is Disabled.NSLog(@"EBPurchase requestProduct: IAP Disabled");return NO;}} else {NSLog(@"EBPurchase requestProduct: productId = NIL");return NO;}}

此方法最重要的是以下这一段代码：里面的 [SKPaymentQueue canMakePayments] 方法是查询用户是否允许应用内付费，如果不允许就不用进行下面的操作了

if ([SKPaymentQueue canMakePayments]) {// Yes, In-App Purchase is enabled on this device.// Proceed to fetch available In-App Purchase items.// Initiate a product request of the Product ID.SKProductsRequest *prodRequest = [[SKProductsRequest alloc] initWithProductIdentifiers:[NSSet setWithObject:productId]];prodRequest.delegate = self;[prodRequest start];[prodRequest release];return YES;} else {// Notify user that In-App Purchase is Disabled.NSLog(@"EBPurchase requestProduct: IAP Disabled");return NO;}

3）由以上代码里的 [prodRequest start ]方法会由系统调SKProductsRequestDelegate协议里以下方法：

- (void)productsRequest:(SKProductsRequest *)request didReceiveResponse:(SKProductsResponse *)response {// Parse the received product info.self.validProduct = nil;int count = [response.products count];if (count>0) {// Grab the first product in the array.self.validProduct = [response.products objectAtIndex:0];}if (self.validProduct) {// Yes, product is available, so return values.[delegate requestedProduct:self identifier:self.validProduct.productIdentifier name:self.validProduct.localizedTitle price:[self.validProduct.price stringValue] description:self.validProduct.localizedDescription];} else {// No, product is NOT available, so return nil values.[delegate requestedProduct:self identifier:nil name:nil price:nil description:nil];}
}

上面提供的Product ID如果不正确，以上方法查询会失败，count为0.如果正确，在以上方法里由 [delegate requestedProduct:self identifier:self.validProduct.productIdentifier name:self.validProduct.localizedTitle price:[self.validProduct.price stringValue] description:self.validProduct.localizedDescription] 调ViewController.m里EBPurchaseDelegate协议里的以下方法：

-(void) requestedProduct:(EBPurchase*)ebp identifier:(NSString*)productId name:(NSString*)productName price:(NSString*)productPrice description:(NSString*)productDescription
{NSLog(@"ViewController requestedProduct");if (productPrice != nil) {// Product is available, so update button title with price.[buyButton setTitle:[@"Buy Game Levels Pack " stringByAppendingString:productPrice] forState:UIControlStateNormal];buyButton.enabled = YES; // Enable buy button.} else {// Product is NOT available in the App Store, so notify user.buyButton.enabled = NO; // Ensure buy button stays disabled.[buyButton setTitle:@"Buy Game Levels Pack" forState:UIControlStateNormal];UIAlertView *unavailAlert = [[UIAlertView alloc] initWithTitle:@"Not Available" message:@"This In-App Purchase item is not available in the App Store at this time. Please try again later." delegate:nil cancelButtonTitle:@"OK" otherButtonTitles:nil];[unavailAlert show];[unavailAlert release];}
}

从上面方法代码能看到 buyButton.enabled = YES 现在点击界面里的Buy按钮进行购买操作

跳转到以下方法：

-(IBAction)purchaseProduct<span style="font-family: Arial, Helvetica, sans-serif; background-color: rgb(255, 255, 255);">由此方法里的</span><span style="font-family: Arial, Helvetica, sans-serif;">[demoPurchase purchaseProduct:demoPurchase.validProduct]</span><span style="font-family: Arial, Helvetica, sans-serif; background-color: rgb(255, 255, 255);">跳转到EBPurchase.m里的以下方法：</span>

-(bool) purchaseProduct:(SKProduct*)requestedProduct
{if (requestedProduct != nil) {NSLog(@"EBPurchase purchaseProduct: %@", requestedProduct.productIdentifier);if ([SKPaymentQueue canMakePayments]) {// Yes, In-App Purchase is enabled on this device.// Proceed to purchase In-App Purchase item.// Assign a Product ID to a new payment request.SKPayment *paymentRequest = [SKPayment paymentWithProduct:requestedProduct]; // Assign an observer to monitor the transaction status.[[SKPaymentQueue defaultQueue] addTransactionObserver:self];// Request a purchase of the product.[[SKPaymentQueue defaultQueue] addPayment:paymentRequest];return YES;

当购买有结果时会由系统调用SKPaymentTransactionObserver协议里的以下方法：

- (void)paymentQueue:(SKPaymentQueue *)queue updatedTransactions:(NSArray *)transactions {for(SKPaymentTransaction *transaction in transactions) {switch ((int)transaction.transactionState) {case SKPaymentTransactionStatePurchasing:// Item is still in the process of being purchasedbreak;case SKPaymentTransactionStatePurchased:// Item was successfully purchased!// Return transaction data. App should provide user with purchased product.[delegate successfulPurchase:self identifier:transaction.payment.productIdentifier receipt:transaction.transactionReceipt];// After customer has successfully received purchased content,// remove the finished transaction from the payment queue.[[SKPaymentQueue defaultQueue] finishTransaction: transaction];break;case SKPaymentTransactionStateRestored:// Verified that user has already paid for this item.// Ideal for restoring item across all devices of this customer.// Return transaction data. App should provide user with purchased product.[delegate successfulPurchase:self identifier:transaction.payment.productIdentifier receipt:transaction.transactionReceipt];// After customer has restored purchased content on this device,// remove the finished transaction from the payment queue.[[SKPaymentQueue defaultQueue] finishTransaction: transaction];break;case SKPaymentTransactionStateFailed:// Purchase was either cancelled by user or an error occurred.if (transaction.error.code != SKErrorPaymentCancelled) {// A transaction error occurred, so notify user.[delegate failedPurchase:self error:transaction.error.code message:transaction.error.localizedDescription];}// Finished transactions should be removed from the payment queue.[[SKPaymentQueue defaultQueue] finishTransaction: transaction];break;}}
}

购买成功后进行移除监听：

- (void)paymentQueue:(SKPaymentQueue *)queue removedTransactions:(NSArray *)transactions
{NSLog(@"EBPurchase removedTransactions");// Release the transaction observer since transaction is finished/removed.[[SKPaymentQueue defaultQueue] removeTransactionObserver:self];
}

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