fetchrequest_session-view.swift

internal struct SessionView : View
{
    ...

    @ObservedObject private var sessionModel: SessionViewModel
    
    /// Vista
    var body: some View
    {
        ScrollView([ .vertical ], showsIndicators: false)
        {
            Button(action: self.handleFavoriteButtonTap) {
                Text(self.sessionModel.isFavorite ? "Quitar de Favoritos" : "Marcar como favorita")
                    .font(.callout)
                    .fontWeight(.semibold)
                    .foregroundColor(self.sessionModel.isFavorite ? .accentColor : .white)
                    .frame(minWidth: 0, maxWidth: .infinity)
            }
            .frame(height: 50)
            .background(self.sessionModel.isFavorite ? Color.white : Color.accentColor)
            .cornerRadius(6)
            .shadow(radius: self.sessionModel.isFavorite ? 0 : 4)
            .padding([.top, .bottom], 24)

            ...
        }

        ...
    }

    /**

    */
    internal init(for session: Session)
    {
        ...

        self.sessionModel = SessionViewModel(forSession: session)
    }
    
    /**

    */
    private func handleFavoriteButtonTap() -> Void
    {
        self.sessionModel.isFavorite.toggle()
    }
}