如何为 Imgur JSON 创建模型对象 |迅速

如何解决如何为 Imgur JSON 创建模型对象 |迅速

Imgur 图像搜索响应具有以下结构（简化）：

{ "data": [  {"title" : "Kittens","images" : [ { "title" : "","descripton" : "","nsfw" : "","link" : "https:\/\/i.imgur.com\/L1olKr1.jpg"
                          },{ "title" : "","link" : "https:\/\/i.imgur.com\/L1olKr1.jpg" }]
                },{"title" : "Kittens","link" : "https:\/\/i.imgur.com\/L1olKr1.jpg"
                              },"link" : "https:\/\/i.imgur.com\/L1olKr1.jpg" }]
          }]
   }

目标是为其创建模型。 我的尝试：

struct RawServerResponse: Decodable {
    
    // MARK: - ImageCategoy
    struct ImageCategory: Codable {
        let title: String
        let images: [Image]
    }

    // MARK: - Image
    struct Image: Codable {
        let title,descripton,nsfw: String
        let link: String
    }
    
    let data: [ImageCategory]
}

// We need to be getting an array of [ImageModel] as a result of decoding.

// Flattens nested json model to get data that only we need:
struct ImageModel: Decodable {
    let title: String
    let description: String
    let nsfw: String
    let link: String
    
    init(from decoder: Decoder) throws {
        let rawResponse = try RawServerResponse(from: decoder)
        
        title = rawResponse.data.first!.title
        description = rawResponse.data.first!.images.first!.descripton
        nsfw = rawResponse.data.first!.images.first!.nsfw
        link = rawResponse.data.first!.images.first!.link
        
    }

调用不起作用：

  let decodedImageModel : ImageModel = try JSONDecoder().decode(ImageModel.self,from: data)

我需要获取一个 [ImageModel] 数组。 请让我知道是否有更简单的方法从 imgur 响应中获取图像。

---

更新 1： 包含@Gereon 回应的最终答案。 注意：json 中的一些值最终为 null 而不是字符串。为了处理这种情况，需要添加 'init' 方法，该方法为不存在的值提供空字符串：

import Foundation

struct ImgurResponse: Codable {
    let data: [ImageData]
}

struct ImageData: Codable {
    let title: String
    let images: [Image]
}

struct Image: Codable {
    let title,description,nsfw: String
    let link: String
    
    enum CodingKeys: String,CodingKey {
        case title
        case description
        case nsfw
        case link
    }
    
    init(from decoder: Decoder) throws {
        let container = try decoder.container(keyedBy: CodingKeys.self)
        title = try container.decodeIfPresent(String.self,forKey: .title) ?? ""
        description = try container.decodeIfPresent(String.self,forKey: .description) ?? ""
        nsfw = try container.decodeIfPresent(String.self,forKey: .nsfw) ?? ""
        link = try container.decodeIfPresent(String.self,forKey: .link) ?? ""
    }
}

---

更新 2：

或者，按照@Gereon 的建议，您可以将相应的属性标记为可选，例如 let link: String?。这使您可以摆脱手动 CodingKeys 和 init 实现。

解决方法

无需创建重复的 ImageModel 结构体，您可以直接从 API 响应中提取所需信息：

struct ImgurResponse: Codable {
    let data: [ImageData]
}

struct ImageData: Codable {
    let title: String
    let images: [Image]
}

struct Image: Codable {
    let title,descripton,nsfw: String
    let link: String
}

let response = try JSONDecoder().decode(ImgurResponse.self,from: data)

let images = response.data.flatMap { $0.images.compactMap { $0 }} // [Image]

,

模型

  struct RawServerResponse: Decodable {
        
        // MARK: - ImageCategoy
        struct ImageCategory: Codable {
            let title: String
            let images: [Image]
        }
    
        // MARK: - Image
        struct Image: Codable {
            let title,nsfw: String
            let link: String
        }
        
        let data: [ImageCategory]
    }
    
    // We need to be getting an array of [ImageModel] as a result of decoding.
    
    // Flattens nested json model to get data that only we need:
    struct ImageModel: Decodable {
        let title: String
        let description: String
        let nsfw: String
        let link: String
        
        
        init(title: String,desc: String,nsfw: String,link: String) {
            self.title = title
            self.description = desc
            self.nsfw = nsfw
            self.link = link
        }
    }
    
    struct ImageModels: Decodable {
        let arrObj:[ImageModel]
        
        init(from decoder: Decoder) throws {
            let rawResponse = try RawServerResponse(from: decoder)
            arrObj  = rawResponse.data.compactMap{ ImageModel(title: $0.title,desc: $0.images.first!.descripton,nsfw: $0.images.first!.nsfw,link: $0.images.first!.link)}
            /*var arr: [ImageModel] = []
            for imagecat in rawResponse.data{
                let model = ImageModel(title: imagecat.title,desc: imagecat.images.first!.descripton,nsfw: imagecat.images.first!.nsfw,link: imagecat.images.first!.link)
                arr.append(model)
            }
            
            arrObj = arr*/
        }
    }

解析

do{
                let serverData = try Data(contentsOf: data)
                let decodedImageModel : ImageModels = try JSONDecoder().decode(ImageModels.self,from: serverData)
                print("Response Success: \(decodedImageModel)")
            }catch{
                print("Error Data: \(error.localizedDescription)")
            }