StudentsView.swift

import SwiftUI

struct StudentsView: View {
    
    @State var predicate: NSPredicate = NSPredicate(format: "firstName contains[c] %@", "Joe")
    
    var body: some View {
        VStack {
            FetchedObjects(
                predicate: self.predicate,
                sortDescriptors: [
                    NSSortDescriptor(key: "firstName", ascending: true)
                ])
            { (students: [Student]) in
                List {
                    ForEach(students) { student in
                        Text(student.name ?? "NA")
                    }
                }
            }
            
            Button(action: {
                self.predicate = NSPredicate(format: "firstName contains[c] %@", "Mary")
            }) {
                Text("Find Mary")
            }
        }
    }
    
}

struct ExampleView_Previews: PreviewProvider {
    static var previews: some View {
        StudentsView()
    }
}