Type of Navigation bar

CustomNavigationBar.swift

//Define different types of navigation bar application requires
enum NavigationbarType {
    case NavPlainBackButton
    case NavCenterTitleImageWithNoBackButton
    case NavCenterTitleWithBackButton
    case NavWithTitleOnly
    case NavWithLocationSearch
}

CustomNavigationBarProtocol.swift

//create a protocol which takes input of navigation type and selectors
protocol CustomNavigationBarProtocol {
  func setNavigationbartype(_ type:NavigationbarType,pageTitle:String?,leftSelector:Selector,rightSelector:Selector?) -> Any?
}

//Write extension for above protocol

extension CustomNavigationBarProtocol where Self:UIViewController  {
  @discardableResult
  func setNavigationbartype(_ type:NavigationbarType,pageTitle:String?,leftSelector:Selector,rightSelector:Selector?) -> Any? {
     switch navType {
        case .NavCenterTitleImageWithNoBackButton:
            setImageAsNavTitleView()
        case .NavCenterTitleWithBackButton:
            setTitleViewOfpage(title: centerTitle!,leftSelector: leftSelector!)
        case .NavPlainBackButton:
            setOriginalBackImage(selector: leftSelector!)
        case .NavWithTitleOnly:
            setOnlyTitleWithoutBackButton(title: centerTitle ?? "")
        case .NavWithLocationSearch:// search bar will be returned
            return showLocationSearchOnNavBar(leftSelector: leftSelector!)
        }
        return nil
  }
}