数组内的JSON数组 [英] JSON array inside of an array

问题描述

我正在寻找访问位于另一个数组内的JSON数组内的字符串.我正在使用JSONDecoder访问JSON API.在尝试使用JSON数组时过去使用的各种方法时，我收到错误消息.

I am looking to access a string that is located inside of a JSON array that is located inside of another array. I am accessing the JSON API using JSONDecoder. I am receiving errors when trying the various methods that I have used in the past when using JSON arrays.

这是代码:

var country = [Results]()

struct Rating: Codable {
    let results: [Results]
}

struct Results: Codable {
    let iso_3166_1: String
    let release_dates: [Release_Dates]
}

struct Release_Dates: Codable {
    let certification: String
}


func loadRating() {

    let id = filmId
    let apiKey = ""
    let url = URL(string: "https://api.themoviedb.org/3/movie/\(id)/release_dates?api_key=\(apiKey)")
    let request = URLRequest(
        url: url! as URL,
        cachePolicy: URLRequest.CachePolicy.reloadIgnoringLocalCacheData,
        timeoutInterval: 10 )

    let session = URLSession (
        configuration: URLSessionConfiguration.default,
        delegate: nil,
        delegateQueue: OperationQueue.main
    )

    let task = session.dataTask(with: request, completionHandler: { (dataOrNil, response, error) in
        if let data = dataOrNil {
            do { let rates = try! JSONDecoder().decode(Rating.self, from: data)
               self.country = rates.results
                let us = self.country.filter({ $0.iso_3166_1.contains("US") })
                print(us)


        }
        }

    })

    task.resume()
}

us打印到控制台

[Film.DetailsView.Results(iso_3166_1: "US", release_dates: [Film.DetailsView.Release_Dates(certification: "PG-13")])]

我正在尝试访问certification字符串.

I am trying to access the certification string.

用于实现此目的的正确方法是什么?

What would be the correct method used to achieve this?

推荐答案

us是Results的数组.

要获得第一个认证，请​​使用此:

To get the first certification use this:

print(us.first!.release_dates.first!. certification)

为简洁起见，我被迫解开包装，您应该使用可选的装订或保护声明正确地进行包装.

I am force unwrapping for brevity, you should properly do it with optional binding or the guard statement.

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