将数据 JSON API 传递给 .sheet(isPresented) SwiftUI

Question

如何将数据传递给.sheet(isPresented) 我从 JSON API 中获得了 10 个名字，但是当我单击这些名字时，.sheet(isPresented) 显示了一个名字。在我所有的 10 个 .sheet(isPresented) 中只显示一个名字

struct Course: Hashable, Codable {
    let name: String
}

class ViewModel: ObservableObject {
    @Published var courses: [Course] = []

    func fetch() {
        guard let url = URL(string: "JSON URL") else {return}
        let task = URLSession.shared.dataTask(with: url) { [weak self] data, _, error in
            guard let data = data, error == nil else {return}
            do {
                let courses = try JSONDecoder().decode([Course].self, from: data)
                DispatchQueue.main.async {
                    self?.courses = courses
                }
            }
            catch {
                print(error)
            }
        }
        task.resume()
    }
}


struct List: View {
    
    @StateObject var viewModel = ViewModel()
    
    @State var show = false
    
    let columns: [GridItem] = [
        
        GridItem(.flexible(), spacing: nil, alignment: nil),
        GridItem(.flexible(), spacing: nil, alignment: nil),
        GridItem(.flexible(), spacing: nil, alignment: nil)
        
    ]
    
    var body: some View {
        ScrollView(.vertical, showsIndicators: false) {
            LazyVGrid(columns: columns) {
                
                ForEach(viewModel.courses, id: \.self) { course in
                    
                    VStack {
                        
                        Text(course.name)
                            .foregroundColor(.white)
                            .lineLimit(1)
                            .padding(.bottom)
                        
                    }
                    .frame(width: 90, height: 90)
                    .background(Color.gray)
                    .onTapGesture {
                        self.show = true
                        
                    }.sheet(isPresented: self.$show, onDismiss: {
                        
                        self.show = false
                        
                    }, content: {
                        
                        Text(course.name)
                        
                    })
                }
            }
        }
        .onAppear {
            viewModel.fetch()
        }
    }
}

我从中获取姓名数据的 JSON API 看起来像这样

[
  {
    "id": 1,
    "name": "Alex"
  },
  {
    "id": 2,
    "name": "Sam"
  },
  {
    "id": 3,
    "name": "Den"
  }
]

抱歉，我不能在这里写 link 如果你不明白我问题的本质，请向我询问必要的细节。

Answer 1

如评论中所述，您需要切换到 sheet(item:) 形式并将其移出 ForEach。您还希望您的模型符合 Identifiable.

此外，即使您不想在此处主动使用 List，您仍应将您的组件命名为其他名称以避免与同名 SwiftUI 组件。

struct Course: Hashable, Codable, Identifiable {
    let id: Int
    let name: String
}

class ViewModel: ObservableObject {
    @Published var courses: [Course] = [
        .init(id: 1, name: "Course 1"),
        .init(id: 2, name: "Course 2"),
        .init(id: 3, name: "Course 3"),
    ]
    
    func fetch() {
        //...
    }
}


struct MyList: View {
    
    @StateObject private var viewModel = ViewModel()
    
    @State private var showItem: Course? = nil
    
    let columns: [GridItem] = [
        
        GridItem(.flexible(), spacing: nil, alignment: nil),
        GridItem(.flexible(), spacing: nil, alignment: nil),
        GridItem(.flexible(), spacing: nil, alignment: nil)
        
    ]
    
    var body: some View {
        ScrollView(.vertical, showsIndicators: false) {
            LazyVGrid(columns: columns) {
                
                ForEach(viewModel.courses, id: \.self) { course in
                    
                    VStack {
                        
                        Text(course.name)
                            .foregroundColor(.white)
                            .lineLimit(1)
                            .padding(.bottom)
                        
                    }
                    .frame(width: 90, height: 90)
                    .background(Color.gray)
                    .onTapGesture {
                        self.showItem = course
                    }
                }
                .sheet(item: $showItem) { course in
                    Text(course.name)
                }
            }
        }
        
        .onAppear {
            viewModel.fetch()
        }
    }
}

将数据 JSON API 传递给 .sheet(isPresented) SwiftUI

Pass data JSON API to .sheet(isPresented) SwiftUI

ios

swift

swiftui