找不到 iOS 收据

Question

我正在 Swift 3.0 应用程序中实现应用程序内购买，因此我需要获取应用程序收据以根据 iTunes 商店对其进行验证。这是我获得收据的方式:

func getReceipt() -> Data? {
    if Bundle.main.appStoreReceiptURL != nil {
        print("app receipt: \(Bundle.main.appStoreReceiptURL)")
        do {
            let receiptData = try Data(contentsOf: Bundle.main.appStoreReceiptURL!)
            print(receiptData)
            return receiptData
        } catch {
            print("error converting receipt to Data: \(error.localizedDescription)")
        }
    }
    return nil
}

我的收据 URL 的控制台输出是:

app receipt: Optional(file:///Users/dustinspengler/Library/Developer/XCPGDevices/433E8E8F-B781-4ADC-A92D-5CABC28E94D6/data/Containers/Data/Application/C25BE9B6-FB64-4D49-9CF2-9DA371060A7B/StoreKit/receipt)

然后无法将收据转换为 Data 并且 catch 语句打印:

error converting receipt to Data: The file “receipt” couldn’t be opened because there is no such file.

我在 Playground 、模拟器和真实设备上运行时得到完全相同的输出，所以考虑到用户尚未进行应用内购买，这是否意味着该应用不存在收据? 在阅读 Apple 的 documentation 时我得到的印象是它们总是被创建，而不管之前的购买。

Answer 1

此答案基于应用程序在您的本地计算机上运行的上下文。如果该应用在应用商店上架，即使它是免费的，您下载该应用时也会收到一张收据。

由@Paulw11 回答:

There is no receipt until the user makes a purchase. For an app downloaded from the App Store (even a free one). This is a purchase, so there will be a receipt. For a debug build from Xcode there is no receipt until an in-app purchase is made.