Too Complex To Check Code in Reasonable Time?

Again, I have a vertical stack of horizontal stacks of buttons as follows.

Code Block 
import SwiftUI
struct ContentView: View {
    @State private var eventPresented = Bool()
    @State private var selectedEventIndex = Int()
    @State private var monthSelection = Int()
    
    var body: some View {
        VStack {
            VStack(spacing: 0.0) {
                HStack(spacing: 0.0) {
                    ForEach((0...6), id: \.self) {
                        index in
                        Button(buttonTitles[index] ?? "") {
                            eventPresented = true
                            selectedEventIndex = index + 1 - self.weekIndex
                        }
                        .foregroundColor(titleColors[index])
                        .overlay(Text(eventNumbers[index] ?? "").font(.footnote).foregroundColor(.blue).offset(x: -16, y: -16))
                        .buttonStyle(BorderlessButtonStyle())
                        .frame(width: 48, height: 48, alignment: .center)
                        .background(RoundedRectangle(cornerRadius: 2)
                                        .fill(fillColors[index])
                                        .shadow(color: shadowColors[index], radius: 2, x: 0, y: 0)
                        )
                        .sheet(isPresented: $eventPresented) {
                            EventView(eventVisible: self.$eventPresented, dayFromParent: self.$selectedEventIndex, monthFromParent: self.$monthSelection)
                        }
                    }
                }
                ...
                ...
                HStack(alignment: .top, spacing: 0.0) {
                    ForEach((35...36), id: \.self) {
                        index in
                        Button(buttonTitles[index] ?? "") {
                            eventPresented = true
                            selectedEventIndex = index + 1 - self.weekIndex
                        }
                        .foregroundColor(titleColors[index])
                        .overlay(Text(eventNumbers[index] ?? "").font(.footnote).foregroundColor(.blue).offset(x: -16, y: -16))
                        .buttonStyle(BorderlessButtonStyle())
                        .frame(width: 48, height: 48, alignment: .center)
                        .background(RoundedRectangle(cornerRadius: 2)
                                        .fill(fillColors[index])
                                        .shadow(color: shadowColors[index], radius: 2, x: 0, y: 0)
                        )
                        .sheet(isPresented: $eventPresented) {
                            EventView(eventVisible: self.$eventPresented, dayFromParent: self.$selectedEventIndex, monthFromParent: self.$monthSelection)
                        }
                    }
                }
                .frame(width: 336.0, height: 48.0, alignment: .leading)
            }
        }
    }
}

And I want to send a few variables to EventView when the user clicks on a button.

Code Block 
struct EventView: View {
    @Binding var eventVisible: Bool
    @Binding var dayFromParent: Int
    @Binding var monthFromParent: Int
    var body: some View {
        VStack {
            Text("Window sheet.")
            Button("OK") {
                self.eventVisible = false
                print("month from parent: \(monthFromParent)")
                print("day from parent: \(dayFromParent)")
            }
        }
        .frame(width: 240, height: 180)
    }
}

If I just want to send two variables to it,

Code Block 
EventView(eventVisible: self.$eventPresented, dayFromParent: self.$selectedEventIndex)

the compiler didn't complain. For the third variable, it says

SwiftUI the compiler is unable to type-check this expression in reasonable time; try breaking up the expression into distinct sub-expressions

I know what it means. Some say it could resolve the issue by making the data types of variables clearer. Others say you could use a function to return a variable for a somewhat complex algebra equation. But what can I do in my case? Does anybody have any suggestions?

Thank you