SwiftUI NavigationLink 不将数据发送到另一个视图

Question

这是我的 contentView.swift 文件。我正在尝试使用 navigationLink 将数据从一个视图发送到另一个视图，但我不能。我正在学习 swiftUI 和 iOS 开发。所以我很困惑我做错了什么。

import SwiftUI
import URLImage

struct Response: Codable {
var results: [Result]

}

struct Result: Codable {
var trackId: Int
var trackName: String
var collectionName: String
var artworkUrl100: URL
}

struct ContentView: View {
@State var results = [Result]()


var body: some View {
    NavigationView {
        List(results, id: \.trackId) { item in
            NavigationLink(
                destination: SingleView(item: item),
                label: {
                    HStack() {
                        URLImage(item.artworkUrl100) { image in
                            image
                                .resizable()
                                .aspectRatio(contentMode: .fill)
                                .frame(width: /*@START_MENU_TOKEN@*/100/*@END_MENU_TOKEN@*/, height: /*@START_MENU_TOKEN@*/100/*@END_MENU_TOKEN@*/, alignment: /*@START_MENU_TOKEN@*/.center/*@END_MENU_TOKEN@*/)
                                .cornerRadius(5.0)
                        }
                        
                        VStack(alignment: .leading) {
                            Text(item.trackName)
                                .font(.headline)
                                
                            
                            Text(item.collectionName)
                                .font(.subheadline)
                                .foregroundColor(.secondary)
                                
                            
                            Spacer()
                        }
                        
                        
                    }
                })
            
        }
        .onAppear(perform: loadData)
        .navigationTitle("Native App")
    }
    
    
} 



func loadData() {
    guard let url = URL(string: "https://itunes.apple.com/search?term=arijit&entity=song") else {
        print("Invalid URL")
        return
    }
    let request = URLRequest(url: url)
    URLSession.shared.dataTask(with: request) { data, response, error in
        if let data = data {
            if let decodedResponse = try? JSONDecoder().decode(Response.self, from: data) {
                // we have good data – go back to the main thread
                DispatchQueue.main.async {
                    // update our UI
                    self.results = decodedResponse.results
                }

                // everything is good, so we can exit
                return
            }
        }

        // if we're still here it means there was a problem
        print("Fetch failed: \(error?.localizedDescription ?? "Unknown error")")
    }.resume()
}
}


struct ContentView_Previews: PreviewProvider {
static var previews: some View {
    ContentView()
}
}

我想将值发送到 SingleView.swift 页面。但运气不好。

我的SingleView.swift代码是：

import SwiftUI

struct SingleView: View {
let item: Result

var body: some View {
    Text("")
}
}

struct SingleView_Previews: PreviewProvider {
static var previews: some View {
    SingleView(item: Result)
}
}

请告诉我哪里做错了。谢谢。

Answer 1

对 SingleView

进行一些更改后工作正常

import SwiftUI

struct SingleView: View {
    let item: Result

    var body: some View {
        Text(item.trackName)
    }
}

struct SingleView_Previews: PreviewProvider {
    static var previews: some View {
        SingleView(item: Result(trackId: 1, trackName: "Track Name", collectionName: "Coll name", artworkUrl100: URL(string: "
    }
}

SwiftUI NavigationLink 不将数据发送到另一个视图

SwiftUI NavigationLink not sending data to another view

ios

swift

swiftui

swiftui-navigationlink