在 swift 3 中打印 json 时出现任何下标成员错误 [重复]

Posted 2023-03-14

【中文标题】在 swift 3 中打印 json 时出现任何下标成员错误 [重复]

【英文标题】：I am getting error of any subscript member error while printing json in swift 3 [duplicate]

【发布时间】：2018-02-19 07:29:21

【问题描述】：

我不知道该怎么做，请帮助我 错误是：

类型 'Any' 没有下标成员

import UIKit

class ViewController: UIViewController 

    @IBOutlet weak var Lab: UILabel!
    override func viewDidLoad() 
        super.viewDidLoad()
        // Do any additional setup after loading the view, typically from a nib.

        if let url = URL(string: "MY URL")
        
            processData(url: url);
        
    


    private func processData(url: URL)
    
        let task = URLSession.shared.dataTask(with: url)  (data, response, error) -> Void in
            if error != nil 
                print(error)
             else 
                if let result = data
                
                    do
                        let json = try JSONSerialization.jsonObject(with: result, options:JSONSerialization.ReadingOptions.mutableContainers)

                        print(json)

                        if let name = json["bname"] as? String
                        
                            print (name);
                                           
                    catch let error as NSError
                    
                        print("error is \(error)")
                    
                
        
    

  task.resume()

我的 JSON 是：

    "bank_detail" =     (
                
            0 = 1;
            1 = www;
            2 = "PRAKHAR SONI";
            3 =123;
            4 = UDAIPUR;
            5 = ee;
            6 = 3190;
            7 = "2017-03-15";
            8 = "2017-03-15 13:31:39";
            accno = 123;
            bid = 1;
            bname = www;
            "branch_code" = 3190;
            "branch_name" = UDAIPUR;
            date = "2017-03-15";
            "date_time" = "2017-03-15 13:31:39";
            ifsc = www;
            uname = "PRAKHAR SONI";
        ,
                
            0 = 3;
            1 = "www ";
            2 = "Sureshkumar Soni";
            3 = "123 ";
            4 = "UDAIPUR ";
            5 = "www ";
            6 = "3190 ";
            7 = "2017-03-17";
            8 = "2017-03-17 12:24:24";
            accno = "www ";
            bid = 3;
            bname = "www ";
            "branch_code" = "3190 ";
            "branch_name" = "UDAIPUR ";
            date = "2017-03-17";
            "date_time" = "2017-03-17 12:24:24";
            ifsc = "www ";
            uname = "Sureshkumar Soni";
        
    );

【问题讨论】：

这很正常。你从来没有说过json 可以有下标（意思是你可以做json["someKey"]）。默认情况下，它是一个 Any 对象。所以告诉编译器这是一个[String:Any] 和let json = try JSONSerialization.jsonObject(with: result, options:[]) as? [String: Any]。你也不应该在 Swift 中需要 mutableContainers。

顺便说一句，既然您已经展示了 JSON，json["bname"] 将返回 nil，因为您不了解 JSON 的结构。

【参考方案1】：

您的问题是没有将 json 转换为预期的内容，例如 [String:Any] 如果它是字典，或者 [String] 是字符串数组，您可以试试这个

let json = try JSONSerialization.jsonObject(with: result, options:JSONSerialization.ReadingOptions.mutableContainers) as? [String:Any]