For some reason, my "Add Event" button is always disabled and I can't figure out why. What am I missing here?

struct AddEventView: View {
    @Environment(\.presentationMode) var presentationMode

    @State private var addEventVM = AddEventVM()

    var body: some View {
        VStack {
            TextField("Enter name", text: $addEventVM.name)
            Button("Add Event") {
                self.addEventVM.saveEvent()
                self.presentationMode.wrappedValue.dismiss()
            }.disabled(self.addEventVM.name == "")
            .padding()
        }
    }
}

class AddEventVM {
    var name: String = ""

    func saveEvent() {
        CoreDataManager.shared.saveEvent(name: self.name)
    }
}

This code is working perfectly fine without using a view model.

struct AddEventView: View {
    @Environment(\.presentationMode) var presentationMode

    @State private var name = ""

    var body: some View {
        VStack {
            TextField("Enter name", text: $name)
            Button("Add Event") {
                self.addEventVM.saveEvent()
                self.presentationMode.wrappedValue.dismiss()
            }.disabled(self.name == "")
            .padding()
        }
    }
}