致命错误:Dictionary< String，Any>不符合Decodable，因为Any不符合Decodable [英] Fatal error: Dictionary<String, Any> does not conform to Decodable because Any does not conform to Decodable

问题描述

我正在尝试使用swift 4解析本地json文件:

I'm trying to use swift 4 to parse a local json file:

{
    "success": true,
    "lastId": null,
    "hasMore": false,
    "foundEndpoint": "https://endpoint",
    "error": null
}

这是我正在使用的功能:

This is the function I'm using:

    func loadLocalJSON() {

        if let path = Bundle.main.path(forResource: "localJSON", ofType: "json") {
            let url = URL(fileURLWithPath: path)

            do {
                let data  = try Data(contentsOf: url)
                let colors = try JSONDecoder().decode([String: Any].self, from: data)
                print(colors)
            }
            catch { print("Local JSON not loaded")}
        }
    }
}

但我不断收到错误消息:

but I keep getting the error:

致命错误:字典不符合可解码" 因为Any不符合Decodable.

Fatal error: Dictionary does not conform to Decodable because Any does not conform to Decodable.

我尝试在此stackoverflow页面上使用"AnyDecodable"方法:.有谁知道如何在Swift 4中解析此JSON数据?

I tried using the "AnyDecodable" approach on this stackoverflow page: How to decode a property with type of JSON dictionary in Swift 4 decodable protocol but it jumps to the 'catch' statement: catch { print("Local JSON not loaded") when being used. Does anyone know how to parse this JSON data in Swift 4?

推荐答案

也许您误解了Codable的工作方式.它基于具体类型.不支持Any.

Maybe you are misunderstanding how Codable works. It's based on concrete types. Any is not supported.

在您的情况下，您可以创建类似的结构

In your case you might create a struct like

struct Something: Decodable {
    let success : Bool
    let lastId : Int?
    let hasMore: Bool
    let foundEndpoint: URL
    let error: String?
}

并解码JSON

func loadLocalJSON() {
    let url = Bundle.main.url(forResource: "localJSON", withExtension: "json")!
    let data  = try! Data(contentsOf: url)
    let colors = try! JSONDecoder().decode(Something.self, from: data)
    print(colors)
}

任何崩溃都会显示设计错误.在主捆绑包中的文件中使用null的感觉是另一个问题.

Any crash will reveal a design error. The sense of using null in a file in the main bundle is another question.

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