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对于尚未在 Apple App Store 上发布的免费应用程序，我正在努力测试收据验证功能。

Bundle.main.appStoreReceiptURL是收据明显所在的位置，但不能保证收据末尾有文件。

我的假设是：

  1. 从 App Store 下载应用程序后，必须有收据。即使应用程序是免费的
  2. 此收据可通过以下方式验证：https ://developer.apple.com/documentation/appstorereceipts/responsebody/receipt
  3. 创建该收据不一定需要应用内购买。

上述假设是否准确？如果是这样，甚至无法找到查看样本收据的方法（即使在 TestFlight 上下载）。

我不知道如何测试这个！

extension DebugViewController: SKRequestDelegate {
    
    
    func checkReceipt() {
        
        let msg: String
        let url = Bundle.main.appStoreReceiptURL!
        if FileManager.default.fileExists(atPath: url.path) {
            if let data = try? Data(contentsOf: url) {
                msg = data.description
                print(msg)
                let t = TextViewController(msg)
                show(t, sender: nil)
            }
        }
        else {
            msg = "No file Found at the url, requesting from appstore...\n\n\(url.absoluteString)"
            let request = SKReceiptRefreshRequest(receiptProperties: nil)
            request.delegate = self
            self.request = request
            self.request?.start()
        }
    }
    
        
    func requestDidFinish(_ request: SKRequest) {
        
        showMsg("completed request", "completed")
        
        var msg: String = "Starting.."
        let url = Bundle.main.appStoreReceiptURL!
        if FileManager.default.fileExists(atPath: url.path) {
            if let data = try? Data(contentsOf: url) {
                msg = data.description
                print(msg)
                let t = TextViewController(msg)
                show(t, sender: nil)
            }
        }
        else {
            msg = "No file exists at path \(url.absoluteString) despite refreshing"
            let t = TextViewController(msg)
            show(t, sender: nil)
        }
        
    
    }
    
    func request(_ request: SKRequest, didFailWithError error: Error) {
        
        let errorStr = String(describing: error)
        let t = TextViewController(errorStr)
        show(t, sender: nil)
    }
}
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