Model

import SwiftUI

struct DiasDaSemana : Identifiable {
    var id = UUID()
    var nome : String
}

Data AND view

import SwiftUI

let semanaData: [DiasDaSemana] = [
    DiasDaSemana(nome: "Segunda"),
    DiasDaSemana(nome: "Terça"),
    DiasDaSemana(nome: "Quarta"),
    DiasDaSemana(nome: "Quinta"),
    DiasDaSemana(nome: "Sexta"),
]

View

import SwiftUI

struct diaView: View {
    var dia : DiasDaSemana
    var body: some View {
        Text(dia) error
    }
}

struct diaView_Previews: PreviewProvider {
    static var previews: some View {
        diaView(dia: semanaData[1])
    }
}

...
 var dias: [DiasDaSemana] = semanaData
 ....var body: some View {....
 ForEach(dias) { item in
                    Text(item) error
                }

WHY I SEE THE ERROR: Initializer 'init(_:)' requires that 'DiasDaSemana' conform to 'StringProtocol'