内购流程

  1. 请求商品列表
  2. 返回有效商品
  3. 显示购买项
  4. 支付

代码实现

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// 引入头文件
#import <StoreKit/StoreKit.h>
@interface ViewController ()<SKProductsRequestDelegate, SKPaymentTransactionObserver>
// 记录商品信息
@property (nonatomic, strong) NSArray *products;
@end

@implementation ViewController

- (void)viewDidLoad {
	[super viewDidLoad];
	// 请求可售商品列表
	// 创建商品ID无序集
	NSSet *set = [NSSet setWithObjects: @"cn.imba97.item1", @"cn.imba97.item2", nil];
	// 创建商品请求对象
	NSProductsRequest *request = [[SKProductsRequest alloc] initWithProductIdentifiers: set];
	// 设置代理
	request.delegate = self;
	// 开始请求
	[request start];
}

// 在代理方法中返回商品列表

- (void)productsRequest:(SKProductsRequest *)request didReceiveResponse:(SKProductsResponse *)response NS_AVAILABLE_IOS(3_0) {
	// 如果标示符不正确，会返回array集合供开发者调试
	// 无效标示符大于0，
	if (response.invalidProductIdentifiers.count > 0) {
		return;
	}
	// 成功返回则保存
	self.products = response.products;
	// 显示到界面
}

// 支付

- (void)pay: (Int) productIndex {
	// 选择商品
	SKProduct *product = self.products[productIndex];
	// 开具凭证
	SKPayment *payment = [SKPayment paymentWithProduct: product];
	// 进入交易队列
	[[SKPaymentQueue defaultQueue] addPayment: payment];
	// 监听支付流程
	[[SKPaymentQueue defaultQueue] addTransactionObserver: self];
}

// 实现监听支付流程协议的方法

- (void)paymentQueue:(SKPaymentQueue *)queue updatedTransactions:(NSArray<SKPaymentTransaction *> *)transactions {
	for (SKPaymentTransaction *transaction in transactions) {
		switch (transaction.transactionState) {
			case SKPaymentTransactionStatePurchasing:
				NSLog(@"正在购买");
				break;
			case SKPaymentTransactionStatePurchased:
				NSLog(@"购买完成");
				// 结束交易
				[[SKPaymentQueue defaultQueue] finishTrancation: trancation];
				break;
			case SKPaymentTransactionStateFailed:
				NSLog(@"购买失败");
				break;
			case SKPaymentTransactionStateRestored:
				NSLog(@"恢复购买");
				// 结束交易
				[[SKPaymentQueue defaultQueue] finishTrancation: trancation];
				break;
			case SKPaymentTransactionStateDeferred:
				NSLog(@"无法判断");
				break;
		}
	}
}

@end

SKPaymentTransactionState的类型

  1. SKPaymentTransactionStatePurchasing - 正在购买
  2. SKPaymentTransactionStatePurchased - 购买完成（客户端必须完成交易）
  3. SKPaymentTransactionStateFailed - 购买失败
  4. SKPaymentTransactionStateRestored - 恢复购买（客户端必须完成交易）
  5. SKPaymentTransactionStateDeferred - 用户未决定（信用卡信息未配置等情况）

恢复购买

恢复之前购买过的商品

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// 按钮点击事件
- (IBAction)restoreClick: (id)sender {
	[[SKPaymentQueue defaultQueue] restoreCompletedTransactions];
}

优化

监听支付流程无需每次购买时添加，只要在购买界面被加载时添加即可

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// 视图将要出现时
- (void)viewWillAppear:(BOOL)animated {
	[super viewWillAppear:animated];
	[[SKPaymentQueue defaultQueue] addTranstactionObserver: self];
}
// 视图消失时
- (void)viewWillDisappear:(BOOL)animated {
	[super viewWillDisappear:animated];
	[[SKPaymentQueue defaultQueue] removeTransactionObserver: self];
}