我收到一个Swift解码错误:解析JSON，发现一个需要字典的数组? [英] I get an Swift Decoding error: parsing JSON, found an Array expected a Dictionary?

问题描述

我收到此错误:

" typeMismatch(Swift.Dictionary< Swift.String，Any>，Swift.DecodingError.Context(codingPath:[]，debugDescription:希望对Dictionary< String，Any>进行解码，但是找到了一个数组."，底层错误:nil))"

"typeMismatch(Swift.Dictionary<Swift.String, Any>, Swift.DecodingError.Context(codingPath: [], debugDescription: "Expected to decode Dictionary<String, Any> but found an array instead.", underlyingError: nil))"

在解码JSON时迅速(来自django rest框架).

In swift while decoding JSON (from django rest framework).

这是json:

[
    {
        "id": 1,
        "title": "1e todo",
        "description": "1e todo test"
    },
    {
        "id": 2,
        "title": "2e todo",
        "description": "2e todo test"
    }
]

这是Swift中的解析函数:

This is the parse function in Swift:

func parseJSON(todoData:Data){
    let decoder = JSONDecoder()
    do{
        let decodedData = try decoder.decode(ToDoData.self, from: todoData)
        fetchedTitle = decodedData.todoitems[1].title
        print(fetchedTitle)

Swift中的结构:

And the Structs in Swift:

import Foundation

struct ToDoData: Decodable {
    //return een list met ToDoData
    let todoitems: [Items]
}

struct Items: Decodable {
    //return een list met ToDoData
    let id: String
    let title: String
    let description: String
}

因此，俗话说找到了一个数组，但是我怎样才能找到标题"?在JSON文件中.

So its saying found an Array, but how can i get to the "Title" in the JSON file.

推荐答案

您的json似乎是 Items 的数组，而不是具有名为 todoitems 的属性的对象，请改为这样做:

Your json seems to be an array of Items, and not an object with a property named todoitems, so do this instead:

let decodedData = try decoder.decode([Items].self, from: todoData)
fetchedTitle = decodedData[1].title

您的 ToDoData 结构不能在这种情况下使用，因为您的json不包含名为 todoitems 的属性.

Your ToDoData struct can't be used in this scenario, since your json doesn't contain a property named todoitems.

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