ios – My Tip Calculator does not work if I get these erors?

I am new coding with Swift and I am doing YouTube’s newbie tasks to study, and at present I am constructing a tip calculator, however I’ve the following errors:

• Non-constant vary: argument have to be an integer literal

• Occasion member ‘tipPercentages’ can’t be used on sort ‘ContentView’; did you imply to make use of a worth of this kind as an alternative?

And that is my code:

import SwiftUI

struct ContentView: View {

@State personal var checkAmount = ""
@State personal var numberPeople = ""
@State personal var tipPercentage = 2

let tipPercentages = [10, 15, 20, 25, 0]

var totalPerPerson: Double {
    
    
    let peopleCount = Double(numberPeople) ?? 0
    let tipSelection = Double(tipPercentages[tipPercentage])
    let orderAmount = Double(checkAmount) ?? 0
    
    let tipVaule = (orderAmount / 100) * tipSelection
    let grandTotal = orderAmount + tipVaule
    let amountPerPerson = grandTotal / peopleCount
    
    return amountPerPerson
    
}


var totalAmount: Double {
    let tipSelection = Double(tipPercentages[tipPercentage])
    let orderAmount = Double(checkAmount) ?? 0
    
    let tipValue = (orderAmount / 100 ) * tipSelection
    let grandTotal = orderAmount + tipValue
    
    return grandTotal
    
    
}

var physique: some View {
    
    
    NavigationView {
        Type{
            Part{
                TextField("Quantity", textual content: $checkAmount)
                    .keyboardType(.decimalPad)
                
                TextField("Variety of folks:", textual content: $numberPeople).keyboardType(.numberPad)
            }
            
            Part(header: Textual content("How a lot tip do you need to depart")) {
                
                
                Picker("Tip Share", choice: $tipPercentage){
                    
                    ForEach(0..<tipPercentages.rely){
                        Textual content("(Self.tipPercentages[$0])%")
                        
                    }
                    
                }
                .pickerStyle(SegmentedPickerStyle(])
                
            }
                    
                    Part(header: Textual content("Quantity per individual")){
                    
                    
                    Textual content("$(totalPerPerson, specifier: "$.2f")")

                }
                    
                    Part(header: Textual content ("Complete quantity of the test")){
                    
                    Textual content("$(totalAmount, specifier: "N.2f")")
                        .foregroundColor(tipPercentage == 4 ? .crimson : .main)
                    
                }
                    
                        .navigationBarTitle("SplitTip")
            
        }
    }
    
}
}

struct ContentView_Previews: PreviewProvider {
    static var previews: some View {
        ContentView()
    }
}