亲爱的，
我有一个关于 iOS 应用内购买的问题，具体针对“自动续订订阅”。我开发了一个包含免费和付费功能的应用程序：付费功能基于“每月订阅和用户享有一周免费试用”。
整个流程都很好：我们将获取产品，用户可以购买，我们将验证收据（我知道收据包含“is_trial”和“Purchase_date”的标志...）......
请注意：我在购买或恢复后立即调用“验证收据”
但是我有以下问题：
1- 如果用户第二次打开应用程序，我如何知道用户仍处于试用期？
2- 如果用户一个月后再次打开应用程序：我如何知道订阅是否已过期...（因此，如果订阅已过期，我将再次进行购买调用...）
解决方案是每次用户打开应用程序时都调用“验证收据”，这样我就可以知道用户处于试用期还是付费期（已过期）...
还是我会在本地保存购买日期（例如：用户默认值），当用户打开应用程序时，我将当前日期与购买日期进行比较，但实际上我不认为这是正确的答案，因为用户可能会更改设备日期......
请给予建议...
以下是代码：
现在打开应用程序时：
我请求产品：
SKPaymentQueue.default().add(self)
if(SKPaymentQueue.canMakePayments()) {
print("IAP is enabled, loading")
let productID: NSSet = NSSet(objects: "test.test1.test2.11")
let request: SKProductsRequest = SKProductsRequest(productIdentifiers: productID as! Set<String>)
request.delegate = self
request.start()
} else {
print("please enable IAPS")
}
当收到产品时：
func productsRequest(_ request: SKProductsRequest, didReceive response: SKProductsResponse) {
print("product request")
let myProduct = response.products
for product in myProduct {
list.append(product)
}
}
现在，当用户按下“by”按钮时：
for product in self.list {
let prodID = product.productIdentifier
if(prodID == "test.test1.test2.11") {
self.p = product
self.buyProduct()
}
}
以下方法将被调用：
func paymentQueue(_ queue: SKPaymentQueue, updatedTransactions transactions: [SKPaymentTransaction]) {
print("add payment")
for transaction: AnyObject in transactions {
let trans = transaction as! SKPaymentTransaction
switch trans.transactionState {
case .purchased:
receiptValidation()
queue.finishTransaction(trans)
break
case .failed:
print("buy error")
queue.finishTransaction(trans)
break
default:
print("Default")
break
}
}
}
& 我将验证收据：
func receiptValidation() {
if let appStoreReceiptURL = Bundle.main.appStoreReceiptURL,
FileManager.default.fileExists(atPath: appStoreReceiptURL.path) {
do {
let receiptData = try Data(contentsOf: appStoreReceiptURL, options: .alwaysMapped)
let receiptString = receiptData.base64EncodedString(options: [])
let dict = ["receipt-data" : receiptString, "password" : "xxxxxxxxxxx"] as [String : Any]
do {
let jsonData = try JSONSerialization.data(withJSONObject: dict, options: .prettyPrinted)
if let sandboxURL = Foundation.URL(string:"https://sandbox.itunes.apple.com/verifyReceipt") {
var request = URLRequest(url: sandboxURL)
request.httpMethod = "POST"
request.httpBody = jsonData
let session = URLSession(configuration: URLSessionConfiguration.default)
let task = session.dataTask(with: request) { data, response, error in
if let receivedData = data,
let httpResponse = response as? HTTPURLResponse,
error == nil,
httpResponse.statusCode == 200 {
do {
if let jsonResponse = try JSONSerialization.jsonObject(with: receivedData, options: JSONSerialization.ReadingOptions.mutableContainers) as? Dictionary<String, AnyObject> {
} else { print("Failed to cast serialized JSON to Dictionary<String, AnyObject>") }
}
catch { print("Couldn't serialize JSON with error: " + error.localizedDescription) }
}
}
task.resume()
} else { print("Couldn't convert string into URL. Check for special characters.") }
}
catch { print("Couldn't create JSON with error: " + error.localizedDescription) }
}
catch { print("Couldn't read receipt data with error: " + error.localizedDescription) }
}
}