SwiftUIFetchRequest.swift

import CoreData
import SwiftUI

struct ContentView : View {
    var request: FetchRequest<Task>
    
    init(taskID: Int) {
        self.request = FetchRequest<Task>(fetchRequest: ContentViewTest.taskRequest(taskID: taskID))
    }
    
    var tasks: [Task] {
        return request.wrappedValue.compactMap({ $0 })
    }
    
    var body: some View {
        List {
            ForEach(self.tasks, id: \.self) { task in
                Text(String(task.id))
            }
        }
    }
    
    static func taskRequest(taskID: Int) -> NSFetchRequest<Task> {
        let request: NSFetchRequest<Task> = Task.fetchRequest()
        request.predicate = NSPredicate(format: "id == %d", taskID)
        request.sortDescriptors = [NSSortDescriptor(key: "id", ascending: true)]
        
        return request
    }
}