我想有一个"全部清除"按钮到这个"教室"视图，但我真的不知道如何进行。
首先，下面是我的设置：

// ClassroomView.swift
import SwiftUI

struct ClassroomView: View {

    @Environment(\.managedObjectContext) private var viewContext
    var classroom: FetchedResults<Classroom>.Element

    var body: some View {
        ScrollView {
            VStack {
                // Some Code Here
                Button("classroom-button-clear", action: { /* What to write here? */ })
                // Some Code Here
                ForEach(classroom.studentArray) { student in
                    StudentView(student: student)
                    Divider()
                }
                // Some Code Here
            }
        }
    }
}

struct StudentView: View {

    var student: FetchedResults<Student>.Element

    var body: some View {
        HStack {
            Text(student.date!)
            Spacer()
            Text(student.name!)
        }
    }
}

extension Classroom {
    public var studentArray: [Student] {
        let set = student as? Set<Student> ?? []
        return set.sorted {
            $0.date! > $1.date!
        }
    }
}

// ClassroomModel.xcdatamodeld

// Entity 1: Classroom (id, date, title, etc...)
     // Relation: student - Student - classroom (To Many)

// Entity 2: Student (id, date, name, etc...)
    // Relation: classroom - Classroom - student (To One)

如果它是一个简单的删除按钮，那么它在ForEach(classroom.studentArray)中可能是这样的：

// StudentView.swift
Button("student-button-clear", action: {
    CoreDataManager.shared.deleteStudent(student: student, context: viewContext)
})

// CoreDataManager.swift
func deleteStudent(student: student, context: NSManagedObjectContext) {
    context.delete(student)
    save(context: context)
}

但是我不知道如何让它在ForEach之外工作，也不知道如何确保每个元素都被删除，而不仅仅是一个!也许，我应该把context.delete(student)放在ForEach里面，但是这感觉不对。
你们怎么做到的？谢谢。