我需要帮助来获取 API 提供的所有 JSON 数据

Question

您好，您能帮我获取所有数据的数组，包括 global_rank、brawlhalla_id 等吗？我只能得到像legend_id、legend_key_name 这样的图例数组。这是json

{
    "name": "bmg | dan",
    "brawlhalla_id": 2,
    "rating": 1745,
    "peak_rating": 1792,
    "tier": "Platinum 2",
    "wins": 207,
    "games": 391,
    "region": "US-E",
    "global_rank": 5698,
    "region_rank": 1644,
    "legends": [
        {
            "legend_id": 4,
            "legend_name_key": "cassidy",
            "rating": 1736,
            "peak_rating": 1792,
            "tier": "Platinum 1",
            "wins": 161,
            "games": 300
        },
        {
            "legend_id": 21,
            "legend_name_key": "barraza",
            "rating": 1640,
            "peak_rating": 1640,
            "tier": "Gold 5",
            "wins": 41,
            "games": 77
        }
    ],
...

我的代码如下所示：

import SwiftUI

class BrawlhallaSevice {
    let url = URL(string: "http://sion.red/brawlhalla/ranked.json")!
    
    func getBrawlhalla(completion: @escaping (Result<[Brawlhalla], Error>) -> Void) {
        URLSession.shared.dataTask(with: url) { data, response, error in
            guard error == nil else {
                completion(.failure(error!))
                return
            }
            
            completion(.success(self.getBrawlhallaResponse(fromData: data!)))
        }.resume()
    }
    
    
    private func getBrawlhallaResponse(fromData data: Data) -> [Brawlhalla] {
        let brawlhallaData = try? JSONDecoder().decode(BrawlhallaResponse.self, from: data)
        if let brawlhallaD = brawlhallaData {
            print(brawlhallaD)
         //return brawlhallaD.legends works and returns array of data about a legend
            return brawlhallaD
    
            
        }
        return [Brawlhalla(legend_name_key: "Error", rating: 0, peak_rating: 0, tier: "Error")]
    }
}

但它会引发错误：“无法将 'BrawlhallaResponse' 类型的返回表达式转换为返回类型 '[Brawlhalla]'”。 这就是我的模型的外观

import Foundation

struct BrawlhallaResponse: Codable {
    let legends: [Brawlhalla]
    let name: String
    let rating: Int
    let peak_rating: Int
    let tier: String
}

import Foundation

struct Brawlhalla: Codable {
    let name: String
    let rating: Int
    let peak_rating: Int
    let tier: String
}

我已尝试对代码进行许多更改，但似乎没有任何效果。

Answer 1

我认为您得到了正确的代码，但您似乎正试图在 if let 语句中返回 brawhallaD。您收到错误是因为您的返回类型是 [Brawlhalla]，但您返回的是 BrawlhallaResponse 类型的 decodedResponse。

所以你可以这样做：

class BrawlhallaSevice {
let url = URL(string: "http://sion.red/brawlhalla/ranked.json")!

func getBrawlhalla(completion: @escaping (Result<BrawlhallaResponse?, Error>) -> Void) {
    URLSession.shared.dataTask(with: url) { data, response, error in
        guard error == nil else {
            completion(.failure(error!))
            return
        }
        guard let safeData = data else { return }
        completion(.success(self.getBrawlhallaResponse(fromData: safeData)))
    }.resume()
}


private func getBrawlhallaResponse(fromData data: Data) -> BrawlhallaResponse?{
    let brawlhallaData = try? JSONDecoder().decode(BrawlhallaResponse.self, from: data)
    if let brawlhallaD = brawlhallaData {
        return brawlhallaD // Will return BrawlhallaResponse.peak_rating and also legends
    }
    return nil
}
}