Question

每次我尝试将swiftview或导航视图添加到swiftui代码时，都会导致该应用程序无法从api加载任何内容。目前，我正在使用OMDB API。粘贴的是我的电影商店和ContentView。目前，我正在使用自定义卡片视图来显示电影商店中的图像和标题，但是在尝试启用滚动视图后，呈现的应用程序的整个预览将完全变为白色。在我注释掉滚动视图之前，什么也不会再次显示。我尝试使用水平视图以及简单的图像和文本vstack来查看卡片视图是否以某种方式将滚动视图弄乱了。

为达到这一目的而进行一些修改后所遵循的教程位于：https://www.youtube.com/watch?v=NvyAN81YcO0

当前我正在运行Xcode 11.6。

import Foundation

struct MovieResponse : Decodable{
    let movies: [Movie]
    
    private enum CodingKeys:String, CodingKey{
        case movies = "Search"
    }
}
struct Movie: Decodable{
    let imdbID :String
    let title: String
    let poster: String
    let type: String
    let year: String
    
    private enum CodingKeys: String, CodingKey{
        case imdbID
        case title = "Title"
        case poster = "Poster"
        case type = "Type"
        case year = "Year"
    }
}

class MovieStore: ObservableObject{
    @Published var movies: [Movie]? = [Movie]()
    
    func getAll(){
        guard let url = URL(string: "") else{
                fatalError("Invalid url")
        }
        
        URLSession.shared.dataTask(with: url) { data, response, error in
            guard let data = data, error == nil else{
                return
            }
            let movieResponse = try? JSONDecoder().decode(MovieResponse.self, from:data)
            
            
            if let movieResponse = movieResponse {
                DispatchQueue.main.async{
                    self.movies = movieResponse.movies
                }
            }
        }.resume()
    }
}

import SwiftUI

struct CardView: View {
    
    var image: URLImage
    var type: String
    var title: String
    var year: String
    
    var body: some View {
        VStack {
            image
                .aspectRatio(contentMode: .fit)
 
            HStack {
                VStack(alignment: .leading) {
                    Text(type)
                        .font(.headline)
                        .foregroundColor(.secondary)
                    Text(title)
                        .font(.title)
                        .fontWeight(.black)
                        .foregroundColor(.primary)
                        .lineLimit(3)
                    Text(year)
                        .font(.caption)
                        .foregroundColor(.secondary)
                }
                .layoutPriority(100)
 
                Spacer()
            }
            .padding()
        }
        .cornerRadius(10)
        .overlay(
            RoundedRectangle(cornerRadius: 10)
                .stroke(Color(.sRGB, red: 150/255, green: 150/255, blue: 150/255, opacity: 0.1), lineWidth: 1)
        )
        .padding([.top, .horizontal])
    }
}


struct ContentView: View {
    
    @ObservedObject var store: MovieStore
    
    var body: some View {
//        ScrollView{
            HStack{
                ForEach(store.movies ?? [Movie](), id: \.imdbID){ movie in
                    VStack{
//                        URLImage(url: movie.poster)
//                            .frame(width: 100, height: 150)
//                        Text(movie.title)
//                            .frame(maxHeight: .infinity, alignment: .top)
                        CardView(image: URLImage(url:movie.poster), type: movie.type, title: movie.title, year: movie.year)
                    }
                }
            }
//        }
        
        
        .onAppear(){
            self.store.getAll()
        }
    }
}

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

编辑：

我能够通过滚动从api弹出的电影来生成应用程序。但仅具有list属性。我注意到我遇到了错误，并且不确定是否会影响api的ping操作。

2020-08-01 18:28:26.274953-0500 Nyx[19421:1105938] Task <B38BF736-765C-4C69-9ADE-AD889ED7BBE5>.<4> finished with error [-1002] Error Domain=NSURLErrorDomain Code=-1002 "unsupported URL" UserInfo={NSUnderlyingError=0x600003c14000 {Error Domain=kCFErrorDomainCFNetwork Code=-1002 "(null)"}, NSErrorFailingURLStringKey=N/A, NSErrorFailingURLKey=N/A, NSLocalizedDescription=unsupported URL}

使用VStack无法使ScrollView在SwiftUI中工作

0 个答案: