我不确定如何在Struct
中启动数组。我无法从数组中获取数据,同时我设法从对象获得结果(platform.status
(。
我是错误的吗?有什么想法吗?
这是网络请求:
func fetchServicePlatform(token: String, _key: String) {
let selectedUrl = URL(string: "(mainUrl)/get_service")
let parameters: [String: String] = ["_key": _key]
var serviceList = [ServiceList]()
URLSession.shared.dataTask(with: setupURLRequest(selectedURL: selectedUrl!, parameters: parameters, token: token, email: "test@gmail.com")) { (data, response, error) in
if let err = error {
print("Failed to fetch API: (err.localizedDescription)")
}
guard let data = data else { return }
do {
guard let json = try JSONSerialization.jsonObject(with: data, options: .mutableContainers) as? [String: Any] else { return }
let platform = Platform(json: json)
if platform.status == "success" {
self.serviceList = platform.service_list
DispatchQueue.main.async {
self.collectionView.reloadData()
}
}
} catch let jsonErr {
print("Failed to fetch service platform: ", jsonErr.localizedDescription)
}
}.resume()
}
这是JSON:
{
"status": "pass",
"service_list": [
{
"title": "Plumber",
"description": "Plumber",
"image": "https://s3-ap-southeast-1.heroku.com.png"
},
{
"title": "Cleaner",
"description": "Cleaner",
"image": "https://s3-ap-southeast-1.heroku.com.png"
}
]
}
这是结构:
struct Platform {
let service_list: [ServiceList]
let status: String
init(json: [String: Any]) {
service_list = [ServiceList(json: json["service_list"] as? [String: Any] ?? [:])]
status = json["status"] as? String ?? ""
}
}
struct ServiceList {
let title: String
let description: String
let image: String
init(json: [String: Any]) {
title = json["title"] as? String ?? ""
description = json["description"] as? String ?? ""
image = json["image"] as? String ?? ""
}
}
在您的数据 json["service_list"]
中是字典数组,
您可以尝试。
struct Platform {
var service_list: [ServiceList] = []
var status: String
init(json: [String: Any]) {
if let jsonArray = json["service_list"] as? [[String: Any]] {
for service in jsonArray {
service_list.append(ServiceList(json: service))
}
}
else{
service_list = []
}
status = json["status"] as? String ?? ""
}
}
init instruct
中的数组struct MyData {
var dataArray:[Any] = []
var latitude: Float
var longitude: Float
}
您必须将字典解开为字典数组,然后用映射或flatmap循环,在其中使用值 $0
作为值
guard let serviceList = (json["service_list"] as? [[String: Any]])?.flatmap({ServiceList(withDictionary: $0)})
使用以下方法,这样就更简单
使用Codable
struct Platform: Codable {
let service_list: [ServiceList]
let status: String
enum CodingKeys: String, CodingKey {
case service_list, status
}
}
struct ServiceList: Codable {
let title: String
let description: String
let image: String
enum CodingKeys: String, CodingKey {
case title, description, image
}
}
您的JSON数据对象
let json = """
{
"status": "pass",
"service_list": [
{
"title": "Plumber",
"description": "Plumber",
"image": "https://s3-ap-southeast-1.heroku.com.png"
},
{
"title": "Cleaner",
"description": "Cleaner",
"image": "https://s3-ap-southeast-1.heroku.com.png"
}
]
}
""".data(using: .utf8)!
使用JSONDecoder
将JSON对象映射到结构
let decoder = JSONDecoder()
let platform = try! decoder.decode(Platform.self, from: json)
if platform.status == "pass"{
for service in platform.service_list{
print(service.title)
}
}