SwiftUI JSON不会在ScrollView HStack中打印标题但会在列表中显示

问题描述

我在ContentView.swift文件中遇到错误，并且在尝试学习时，我不理解错误在说什么。

我无法将Program类型的值分配给Post类型，但是我要获得标题的意思是什么？

如何在HStack中打印？

import SwiftUI
import RemoteImage

struct ContentView: View {
  
    @State var posts: [Program] = []
    
   var body: some View {
    List(posts){ post in
        
        Text("hello")
        
        /*RemoteImage(type: .url(URL(string:post.url)!),errorView: { error in
            Text(error.localizedDescription)
        },imageView: { image in
            image
            .resizable()
            .aspectRatio(contentMode: .fit)
        },loadingView: {
            Text("Loading ...")
        })*/
        
        
       // UrlImageView(post.url)
        } .onAppear {
           Api().getPosts { (posts) in
                            self.posts = posts
                           }
                    }
    

    
   
     
        }
}

import SwiftUI

// Add this top level struct to
// decode properly
struct Post: Codable {
    var programs: [Program]
}

struct Program: Codable,Identifiable {
    let id = UUID()
    var title : String
    var icon : String
}

class Api {
    // Update this to return an array of Program
    func getPosts(completion: @escaping ([Program]) -> ()) {
        guard let url = URL(string: "https://api.drn1.com.au/api-access/programs/DRN1") else { return }
        
        URLSession.shared.dataTask(with: url) { (data,_,_) in
            // Based on the updated structs,you would no
            // longer be decoding an array
            let post = try! JSONDecoder().decode(Post.self,from: data!)
            dispatchQueue.main.async{
                // The array is stored under programs Now
                completion(post.programs)
            }
            
        }
    .resume()
    }
}

这也可以，但是不能滚动。

  ForEach(posts){ post in
                  HStack {Text(post.title)}
               }.onAppear{
                   Api().getPosts { (posts) in
                       self.posts = posts
                   }
               }

要弄清楚我想要得到的最终结果是这个。

ScrollView(.horizontal) {
    HStack(spacing: 20) {
        ForEach(0..<10) {
            Text("Item \($0)")
                .foregroundColor(.white)
                .font(.largeTitle)
                .frame(width: 200,height: 200)
                .background(Color.red)
        }
    }
}

解决方法

请清理并构建项目。该代码似乎正常工作。 我创建了一个新项目，只需复制并粘贴您编写的上述代码即可正常工作。

编辑- 要水平显示列表，请使用以下代码：

var body: some View {
    NavigationView {
        if posts.isEmpty {
            Text("Loading")
        } else {
            ScrollView(.horizontal,showsIndicators: false) {
                HStack(alignment: .center,spacing: 10) {
                    ForEach(posts) { post in
                        return Text(post.title)
                    }
                }
            }.frame(height: 200)
        }
    }.onAppear {
        Api().getPosts { (posts) in
            self.posts = posts
        }
    }.navigationBarTitle(Text("Home"))
}