HTTP POST传多类型参数触发NSInvalidArgumentException问题求助

Hey there, let's break down why you're running into that NSInvalidArgumentException and fix it step by step:

1. 核心触发原因：JSON无法序列化Data类型 #

Look at your postString dictionary—you're trying to put requestData (a Data object) into it with the key "receiptData".

JSON serialization only supports JSON-compatible types: strings, numbers, arrays, dictionaries, booleans, and null. Binary Data isn't part of the JSON spec, so when JSONSerialization.data(withJSONObject:) tries to process this dictionary, it hits a non-serializable type and throws the exception you're seeing.

2. 额外的请求逻辑问题 #

You're using uploadTask(with: request, from: requestData) but also setting request.httpBody to the serialized postString data. This creates a conflict: the from parameter in uploadTask will overwrite your pre-set httpBody, so your full parameter set won't be sent to the server. You should use a regular dataTask instead since you're already assembling the full request body.

修正后的代码片段 #

Here's how to adjust your code to fix both issues:

func receiptValidation() {
    let SUBSCRIPTION_SECRET = mySecretKey
    let defaults = UserDefaults.standard
    
    guard let receiptURL = Bundle.main.appStoreReceiptURL, 
          FileManager.default.fileExists(atPath: receiptURL.path) else {
        print("Receipt file not found")
        return
    }
    
    do {
        let receiptData = try Data(contentsOf: receiptURL, options: .alwaysMapped)
        let base64encodedReceipt = receiptData.base64EncodedString(options: .endLineWithCarriageReturn)
        
        // 直接使用Base64编码后的字符串，而非Data类型
        let postString: [String: Any] = [
            "receiptData": base64encodedReceipt,
            "deviceType": "IOS",
            // 用可选绑定避免强制解包崩溃
            "subscriberId": encodeString(normalString: (defaults.array(forKey: "userDetails")?.first as? String) ?? ""),
            "password": encodeString(normalString: (defaults.array(forKey: "userDetails")?.last as? String) ?? ""),
            "productId": PurchaseManager.instance.productId,
            "code": opcodeDetails["opCode"] ?? ""
        ]
        
        guard JSONSerialization.isValidJSONObject(postString) else {
            print("postString is not valid JSON")
            return
        }
        
        let requestData = try JSONSerialization.data(withJSONObject: postString)
        guard let apiBaseUrl = opcodeDetails["apiProxyBaseUrl"],
              let url = URL(string: "\(apiBaseUrl)/api/validate-receipt-data") else {
            print("Invalid API URL")
            return
        }
        
        var request = URLRequest(url: url)
        request.httpMethod = "POST"
        request.addValue("application/json", forHTTPHeaderField: "Content-Type")
        request.httpBody = requestData
        
        // 使用dataTask而非uploadTask，因为已设置完整的httpBody
        let task = session1?.dataTask(with: request) { (data, response, error) in
            if let error = error {
                print("Request error: \(error.localizedDescription)")
                return
            }
            
            guard let data = data else {
                print("No data received")
                return
            }
            
            do {
                let appReceiptJSON = try JSONSerialization.jsonObject(with: data)
                print("Success! Receipt response: \(appReceiptJSON)")
            } catch {
                print("JSON parsing failed: \(error.localizedDescription)")
            }
        }
        task?.resume()
        
    } catch {
        print("Error processing receipt: \(error.localizedDescription)")
    }
}

额外建议 #

• Avoid force unwraps (!): They're a common source of crashes. Use optional bindings (if let, guard let) or default values like ?? "" to handle nil cases gracefully.
• Validate all inputs: Double-check that values like opcodeDetails["opCode"] and userDetails exist and are of the correct type before using them.
• Check JSON validity: Always use JSONSerialization.isValidJSONObject(_:) before attempting to serialize a dictionary to catch issues early.

内容的提问来源于stack exchange，提问作者Priya Sri