使用Swift 3进行JSON序列化 [英] JSON serialization with Swift 3

问题描述

我试图通过填充JSON数据数组来填充表.我正在使用下面的代码，但始终收到错误:

I am trying to to populate a table by filling an array from JSON data. I am using the code below but keep getting the error:

任何"类型没有下标成员

Type 'Any' has no subscript members

在以下代码行中

:

on the following lines of code:

self.tableData.append(jsonResult[i]["title"]! as! String)
self.tableImages.append(jsonResult[i]["image"]! as! String)
self.tableDesc.append(jsonResult[i]["description"]! as! String)
self.tableValidity.append(jsonResult[i]["validity"]! as! String)

我的代码:

 let str3 = Int(str2!)!
            let url = NSURL(string: "https://www.*****.php")!

            let task = URLSession.shared.dataTask(with: url as URL) { (data, response, error) -> Void in
                if let urlContent = data {
                    do {

                        let jsonResult = try JSONSerialization.jsonObject(with: urlContent, options: JSONSerialization.ReadingOptions.mutableContainers)


                        print(str3)

                        var i = 0

                        while i < str3 {
                            print(jsonResult[i]["title"]! as!String)
                            print(jsonResult[i]["image"]! as! String)

                            self.tableData.append(jsonResult[i]["title"]! as! String)
                            self.tableImages.append(jsonResult[i]["image"]! as! String)
                            self.tableDesc.append(jsonResult[i]["description"]! as! String)
                            self.tableValidity.append(jsonResult[i]["validity"]! as! String)

                            i = i + 1

                        }

                    } catch {
                        print("JSON serialization failed")
                    }                    

                } else {                    
                    print("ERROR FOUND HERE")
                }                

                DispatchQueue.main.async(execute: { () -> Void in

                    self.tableView.reloadData()

                })                                

            }

            task.resume()

推荐答案

编译器不知道jsonResult的类型，您必须说出它是什么，例如使用这样的可选绑定:

The compiler doesn't know the type of jsonResult, you have to tell what it is, for example with optional binding like this:

if let jsonResult = try JSONSerialization.jsonObject(with: urlContent, options: []) as? [[String:AnyObject]] {


}

在这里，我将JSON下放为字典数组.在此if let中使用您的循环，它应该可以工作.

Here I downcast the JSON as an array of dictionaries. Use your loop inside this if let and it should work.

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