将 Swift 2.3 转换为 Swift 3.0 - 错误，无法使用类型参数列表调用“dataTask”

Question

我正在尝试将我的一个项目从 Swift 2.3 转换为 Swift 3.0，但由于某种原因我收到以下错误...

不能使用类型参数列表调用“dataTask”（带有：NSMutableURLRequest，completionHandler:(Data?, UIRLResponse?, NSError) -> Void)'

“dataTask”的重载存在这些部分匹配的参数列表：（带有：URLRequest，completionHandler：@escaping（Data？，URLResponse？，Error？）-> Void），（带有：URL，completionHandler：@escaping（ Data?, URLResponse?, Error?) -> Void)

错误显示在下面代码的这一行中...

let task = session.dataTask(with: request, completionHandler: { (responseData:Data?, response:URLResponse?, error:NSError?) -> Void in

有什么建议吗？

这是发生错误的函数的完整代码。

func verifyReceipt(_ transaction:SKPaymentTransaction?){
        let receiptURL = Bundle.main.appStoreReceiptURL!
        if let receipt = try? Data(contentsOf: receiptURL){
            //Receipt exists
            let requestContents = ["receipt-data" : receipt.base64EncodedString(options: NSData.Base64EncodingOptions(rawValue: 0))]

            //Perform request
            do {
                let requestData = try JSONSerialization.data(withJSONObject: requestContents, options: JSONSerialization.WritingOptions(rawValue: 0))

                //Build URL Request
                let storeURL = URL(string: "https://buy.itunes.apple.com/verifyReceipt")// production URL
                //let storeURL = NSURL(string: "https:/sandbox.itunes.apple.com/verifyReceipt") // Testing URL
                let request = NSMutableURLRequest(url: storeURL!)
                request.httpMethod = "Post"
                request.httpBody = requestData

                let session = URLSession.shared
                let task = session.dataTask(with: request, completionHandler: { (responseData:Data?, response:URLResponse?, error:NSError?) -> Void in
                    //

                    do {
                        let json = try JSONSerialization.jsonObject(with: responseData!, options: .mutableLeaves) as! NSDictionary

                        print(json)

                        if (json.object(forKey: "status") as! NSNumber) == 0 {
                            //

                            if let latest_receipt = json["latest_receipt_info"]{
                                self.validatePurchaseArray(latest_receipt as! NSArray)
                            } else {
                                let receipt_dict = json["receipt"] as! NSDictionary
                                if let purchases = receipt_dict["in_app"] as? NSArray{
                                    self.validatePurchaseArray(purchases)
                                }
                            }

                            if transaction != nil {
                                SKPaymentQueue.default().finishTransaction(transaction!)
                            }

                            DispatchQueue.main.sync(execute: { () -> Void in
                                self.delegate?.managerDidRestorePurchases()
                            })


                        } else {
                            //Debug the receipt
                            print(json.object(forKey: "status") as! NSNumber)
                        }

                    } catch {
                        print(error)
                    }
                })

                task.resume()

            } catch {
                print(error)
            }

        } else {
            //Receipt does not exist
            print("No Receipt")
        }
    }

Answer 1

var request = URLRequest(url: storeURL!)
 request.httpMethod = "Post"

 let task = session.dataTask(with: request, 
                completionHandler: { (responseData:Data?, 
                                          response:URLResponse?, 
                                             error:Error?) -> Void in

 let task = session.dataTask(with: request, 
                completionHandler: { (responseData, response, error) -> Void in

https://swift.org/migration-guide-swift3/

Answer 2

编译器需要URLRequest 和Error

 ...
 var request = URLRequest(url: storeURL!)
 request.httpMethod = "Post"
 ...
 let task = session.dataTask(with: request, 
                completionHandler: { (responseData:Data?, 
                                          response:URLResponse?, 
                                             error:Error?) -> Void in

我建议省略所有类型注释

 let task = session.dataTask(with: request, 
                completionHandler: { (responseData, response, error) -> Void in