ios - 无法将类型 '__NSSingleObjectArrayI' 的值转换为 'NSString'

Question

当 iOS 应用程序触发名为“addtocart”的 API 事件时，应用程序崩溃并返回以下错误。

url https://example.com/index.php/?route=api/cart/addToCart params ["product_id": "12098", "option": "{\n\n}", "quantity": "0", "token": "2f42lqjie21cbzr1r0gsgphqtl", "width": "750.000000"] { error = 1; message = ( "Color required!" ); } Could not cast value of type '__NSSingleObjectArrayI' (0x1b5bee3b0) to 'NSString' (0x1b5bfaad8). 2018-08-02 19:50:28.493678+0300 Ishtari[35479:3846514] Could not cast value of type '__NSSingleObjectArrayI' (0x1b5bee3b0) to 'NSString' (0x1b5bfaad8). warning: could not execute support code to read Objective-C class data in the process. This may reduce the quality of type information available. (lldb)

该产品有一个名为“颜色”的选项，因此在添加到购物车之前，用户应该选择要结帐的商品的颜色。该应用程序返回选项名称“Color”，但没有给我可供选择的值(“option”:“{\n\n}”)，这导致应用程序崩溃，在调用HTTPApi时出现上述错误。

   func callingHttppApi(){
        DispatchQueue.main.async{
            NetworkManager.sharedInstance.showLoader()
            let sessionId = self.defaults.object(forKey:"ic_token");
            let width = String(format:"%f", SCREEN_WIDTH * UIScreen.main.scale)
            self.view.isUserInteractionEnabled = false

            if self.whichApiToProcess == "addtocart"{
                var requstParams = [String:String]();
                requstParams["width"] = width
                requstParams["product_id"] = self.productId
                requstParams["ic_token"] = sessionId as? String
                requstParams["quantity"] = self.quantityValue.text
                do {
                    let jsonSortData =  try JSONSerialization.data(withJSONObject: self.optionDictionary, options: .prettyPrinted)
                    let jsonSortString:String = NSString(data: jsonSortData, encoding: String.Encoding.utf8.rawValue)! as String
                    requstParams["option"] = jsonSortString
                }
                catch {
                    print(error.localizedDescription)
                }


                NetworkManager.sharedInstance.callingHttpRequest(params:requstParams, apiname:"cart/addToCart", cuurentView: self){success,responseObject in
                    if success == 1{
                        let dict = responseObject as! NSDictionary;
                        NetworkManager.sharedInstance.dismissLoader()
                        if dict.object(forKey: "fault") != nil{
                            let fault = dict.object(forKey: "fault") as! Bool;
                            if fault == true{
                                self.loginRequest()
                            }
                        }else{
                            print(dict)
                            self.view.isUserInteractionEnabled = true
                            let dict = responseObject as! NSDictionary
                            if dict.object(forKey: "error") as! Int == 0{
                                NetworkManager.sharedInstance.showSuccessSnackBar(msg: dict.object(forKey: "message") as! String)
                                let data = dict.object(forKey: "total") as! String
                                self.tabBarController!.tabBar.items?[3].badgeValue = data.components(separatedBy: " ")[0]
                                self.navigationCart(cartCount:data.components(separatedBy: " ")[0])
                                if self.goToBagFlag == true{
                                    self.tabBarController!.selectedIndex = 3
                                }

                            }else{
                                NetworkManager.sharedInstance.showWarningSnackBar(msg: dict.object(forKey: "message") as! String)
                            }
                        }
                    }else if success == 2{
                        NetworkManager.sharedInstance.dismissLoader()
                        self.callingHttppApi()
                    }
                }
            }

当它崩溃时，控制台将我定向到这一行

                        }else{
                            NetworkManager.sharedInstance.showWarningSnackBar(msg: dict.object(forKey: "message") as! String)
                        }

请帮忙!

Answer 1

错误很明显:

Could not cast value of type '__NSSingleObjectArrayI' (0x1b5bee3b0) to 'NSString' (0x1b5bfaad8)

左侧显示实际类型(Array)，右侧是您做错的内容(String)

NetworkManager.sharedInstance.showWarningSnackBar(msg: dict.object(forKey: "message") as! [String])

如果 msg 应该是 String join 字符串

let messageArray = dict.object(forKey: "message") as! [String] 
NetworkManager.sharedInstance.showWarningSnackBar(msg: messageArray.joined(separator: ", "))

<小时/>

顺便使用 Swift 原生类型和 key 订阅

let dict = responseObject as! [String:Any]
...
NetworkManager.sharedInstance.showWarningSnackBar(msg: dict["message"] as! [String])

而且 - 抱歉 - 这个语法太糟糕了:

let jsonSortString:String = NSString(data: jsonSortData, encoding: String.Encoding.utf8.rawValue)! as String

请替换为

let jsonSortString = String(data: jsonSortData, encoding: .utf8)!