没有与具有Unsplash API的密钥CodingKeys关联的值

Question

我试图从Unsplash API解码此json，但ContentView显示为空白，如果我打印结果，则我将获得；没有与密钥CodingKeys相关联的值"；错误这很奇怪，因为我正在学习这个非常新的教程https://www.youtube.com/watch?v=CmOe9vNopjU.我很困惑，因为这应该很简单，但我是斯威夫特的新手。

这是完整的错误

"No value associated with key CodingKeys(stringValue: "total", intValue: nil) ("total").", underlyingError: nil))

这是解码请求

class SearchObjectController : ObservableObject {
static let shared = SearchObjectController()
private init() {}

var token = "my client id"
@Published var results = [Result]()
@Published var searchText : String = "Forest"

func search () {
let url = URL(string: "https://api.unsplash.com/search/photos?query=(searchText)")
var request = URLRequest(url: url!)
request.httpMethod = "GET"
request.setValue("Client-ID(token)", forHTTPHeaderField: "Authorization")

let task = URLSession.shared.dataTask(with: request) { (data, response, error) in
guard let data = data else {return}

do {
let res = try JSONDecoder().decode(Results.self, from: data)
self.results.append(contentsOf: res.results)
print(self.results)
} catch {
print(error)
}
}
task.resume()
}
}

这些是我为请求创建的结构

struct Results : Codable {
var total : Int
var results : [Result]
}
struct Result : Codable {
var id : String
var description : String?
var urls : URLs
}
struct URLs : Codable {
var small : String
}

Uncash API请求的json格式如下

{
"total": 133,
"total_pages": 7,
"results": [
{
"id": "eOLpJytrbsQ",
"created_at": "2014-11-18T14:35:36-05:00",
"width": 4000,
"height": 3000,
"color": "#A7A2A1",
"blur_hash": "LaLXMa9Fx[D%~q%MtQM|kDRjtRIU",
"likes": 286,
"liked_by_user": false,
"description": "A man drinking a coffee.",
"user": {
"id": "Ul0QVz12Goo",
"username": "ugmonk",
"name": "Jeff Sheldon",
"first_name": "Jeff",
"last_name": "Sheldon",
"instagram_username": "instantgrammer",
"twitter_username": "ugmonk",
"portfolio_url": "http://ugmonk.com/",
"profile_image": {
"small": "https://images.unsplash.com/profile-1441298803695-accd94000cac?ixlib=rb-0.3.5&q=80&fm=jpg&crop=faces&cs=tinysrgb&fit=crop&h=32&w=32&s=7cfe3b93750cb0c93e2f7caec08b5a41",
"medium": "https://images.unsplash.com/profile-1441298803695-accd94000cac?ixlib=rb-0.3.5&q=80&fm=jpg&crop=faces&cs=tinysrgb&fit=crop&h=64&w=64&s=5a9dc749c43ce5bd60870b129a40902f",
"large": "https://images.unsplash.com/profile-1441298803695-accd94000cac?ixlib=rb-0.3.5&q=80&fm=jpg&crop=faces&cs=tinysrgb&fit=crop&h=128&w=128&s=32085a077889586df88bfbe406692202"
},
"links": {
"self": "https://api.unsplash.com/users/ugmonk",
"html": "http://unsplash.com/@ugmonk",
"photos": "https://api.unsplash.com/users/ugmonk/photos",
"likes": "https://api.unsplash.com/users/ugmonk/likes"
}
},
"current_user_collections": [],
"urls": {
"raw": "https://images.unsplash.com/photo-1416339306562-f3d12fefd36f",
"full": "https://hd.unsplash.com/photo-1416339306562-f3d12fefd36f",
"regular": "https://images.unsplash.com/photo-1416339306562-f3d12fefd36f?ixlib=rb-0.3.5&q=80&fm=jpg&crop=entropy&cs=tinysrgb&w=1080&fit=max&s=92f3e02f63678acc8416d044e189f515",
"small": "https://images.unsplash.com/photo-1416339306562-f3d12fefd36f?ixlib=rb-0.3.5&q=80&fm=jpg&crop=entropy&cs=tinysrgb&w=400&fit=max&s=263af33585f9d32af39d165b000845eb",
"thumb": "https://images.unsplash.com/photo-1416339306562-f3d12fefd36f?ixlib=rb-0.3.5&q=80&fm=jpg&crop=entropy&cs=tinysrgb&w=200&fit=max&s=8aae34cf35df31a592f0bef16e6342ef"
},
"links": {
"self": "https://api.unsplash.com/photos/eOLpJytrbsQ",
"html": "http://unsplash.com/photos/eOLpJytrbsQ",
"download": "http://unsplash.com/photos/eOLpJytrbsQ/download"
}
},
// more photos ...
]
}

Answer 1

当请求无法处理时，许多API通常会在响应体中返回错误的详细描述以及错误代码。这似乎是您的情况，因为JSON解析在结构的第一个字段上失败。首先检查dataTask的completion块中的error和response.statusCode，以确保API已成功处理您的请求并返回有效数据。

Answer 2

导致错误的原因是客户端ID和(令牌(之间缺少空格。