// PackageInstallationProcessSteps enum definition
enum PackageInstallationProcessSteps
{
    case ready, searching, presentingSearchResults, installing, finished
}

// Sheet view
struct AddFormulaView: View
{
    @State var packageInstallationProcessStep: PackageInstallationProcessSteps = .ready

    var body: some View
    {
        switch packageInstallationProcessStep
        {
            case ready:
            // Show a view, then switch packageInstallationProcessStep to .searching
        
            case searching:
            // Show a different view, then switch packageInstallationProcessStep to .presentingSearchResults
            
            case presentingSearchResults:
            // Show a different view, then switch packageInstallationProcessStep to .installing
            
            case installing:
            // Show a different view, then switch packageInstallationProcessStep to .finished
            
            case finished:
            // Show a different view
            
        }
   }
}