我目前正试图利用NewsApi来检索某些文章.我目前确实有一个我生成的模型
import Foundation
// MARK: - Welcome
struct NewsResponse: Codable {
let status: String
let totalResults: Int
let articles: [Article]
enum CodingKeys: String, CodingKey {
case status = "status"
case totalResults = "totalResults"
case articles = "articles"
}
}
// MARK: - Article
struct Article: Codable, Identifiable {
let id = UUID()
let source: Source
let author: String?
let title: String
let articleDescription: String
let url: String
let urlToImage: String?
let publishedAt: Date
let content: String
enum CodingKeys: String, CodingKey {
case source = "source"
case author = "author"
case title = "title"
case articleDescription = "description"
case url = "url"
case urlToImage = "urlToImage"
case publishedAt = "publishedAt"
case content = "content"
}
}
// MARK: - Source
struct Source: Codable {
let id: String?
let name: String
enum CodingKeys: String, CodingKey {
case id = "id"
case name = "name"
}
}我也有我的Webservice，它可以解码let pokeNews = URL(string:"https://newsapi.org/v2/everything?q=pokemon&apiKey=*APIKey*")!的API链接
webservice代码在这里，我使用了MohammedAzam教程:https://www.youtube.com/watch?v=YOCZuZz4vAw
import Foundation
class NewsWebService: ObservableObject{
@Published var news: [Article] = []
func getNews() async throws{
let (data, _) = try await URLSession.shared.data(from: Constants.url.pokeNews)
Task{@MainActor in
self.news = try JSONDecoder().decode([Article].self, from: data)
}
}
}
现在我面临的主要问题是，我无法理解如何从NewsResponse模型访问articles数组并检索文章.标题等.我已经try 过多次，但不太确定如何继续.我看过其他教程，但我觉得我仍然没有理解如何在swift中有效地调用API.我试图在其中调用API的代码如下:
import SwiftUI
struct NewsListView: View {
@EnvironmentObject var newsWebService: NewsWebService
var body: some View {
List(newsWebService.news){ article in
Text(article.title)
}
HStack(alignment: .center, spacing: 16, content: {
//Article Image
Image("yak0")
.resizable()
.scaledToFill()
.frame(width: 50, height: 50)
.clipShape(RoundedRectangle(cornerRadius: 12))
//Article Title
VStack(alignment: .leading, spacing: 8){
Text("Massive News Surrounding Pokemon")
.font(.title2)
.fontWeight(.heavy)
.foregroundColor(.red)
//Article Source
Text("CNN").font(.footnote)
.fontWeight(.bold)
.multilineTextAlignment(.leading)
.foregroundColor(.yellow)
}
}).onTapGesture {
//go to webview
}
}
}
struct NewsListView_Previews: PreviewProvider {
static var previews: some View {
NewsListView()
.previewLayout(.sizeThatFits)
.padding()
.environmentObject(NewsWebService())
}
}任何帮助都将不胜感激.非常感谢！
Edited for NewsResponse portion
import Foundation
class NewsWebService: ObservableObject{
@Published var news: NewsResponse?
func getNews() async throws{
let (data, _) = try await URLSession.shared.data(from: Constants.url.pokeNews)
Task{@MainActor in
self.news = try JSONDecoder().decode(NewsResponse.self, from: data)
}
}
}
The Line showing the error: Initializer 'init(_:rowContent:)' requires that 'NewsResponse' conform to 'RandomAccessCollection'
List(newsWebService.news!){ article in
Text(article.title)
}