我在SwiftUI中显示JSON数据时遇到问题,我从当前正在搜索歌曲的Genius API获取数据,并且可以确认是否正确提取了数据;示例我可以打印出结果的标题:
这就是我获取数据的方式
class NetworkManager: ObservableObject {
var objectWillChange = PassthroughSubject<NetworkManager, Never>()
var fetchedSongsResults = [hits]() {
willSet {
objectWillChange.send(self)
}
}
init() {
fetchSongs()
}
func fetchSongs() {
guard let url = URL(string: "https://api.genius.com/search?q=Sia") else { return }
var urlRequest = URLRequest(url: url)
urlRequest.setValue("Bearer TOKEN", forHTTPHeaderField: "Authorization")
URLSession.shared.dataTask(with: urlRequest) {data, response, error in
guard let data = data else { return }
//print(String(decoding: data, as: UTF8.self))
let songs = try! JSONDecoder().decode(feed.self, from: data)
DispatchQueue.main.async {
self.fetchedSongsResults = songs.response.hits
}
}.resume()
}
}
因此,当我获取数据时,我将其保存到变量fetchedSongsResults中,这看起来是正确的,但是出于某种原因,例如,当我尝试打印计数时,它说我为空,而且我无法使用a循环遍历fetchedSongsResults list或ForEach,这就是方法,(我相信这是因为我没有使模型可识别),我试图打印fetchedSongsResults的计数,
这是在体外初始化的(只是您知道)
@State var networkManager = NetworkManager()
这是在体内
Text("\(networkManager.fetchedSongsResults.count)")
如果您想知道解码JSON数据时我的结构如何,那么就在这里
struct feed: Codable {
var meta: meta
var response: response
}
struct meta: Codable {
var status: Int
}
struct response: Codable {
var hits: [hits]
}
struct hits: Codable {
var index: String
var type: String
var result: song
}
struct song: Codable, Identifiable {
var id: Int
var header_image_thumbnail_url: String
var url: String
var title: String
var lyrics_state: String
var primary_artist: artist
}
struct artist: Codable {
var name: String
}
答案 0 :(得分:0)
尝试:@ObservedObject var networkManager = NetworkManager()。