iOS Swift如何将搜索功能包含在另一个功能中

Question

I have 2 Controllers and one is a SubView. The MainController has access to the SearchBar property and the SubViewController does not . There is a SearchBar function in the Main Controller that I would like to invoke in the SubView Controller it is this function

      // MainController
      func searchBarCancelButtonClicked(_ searchBar: UISearchBar) {
        // Stop doing the search stuff
        // and clear the text in the search bar
        searchBar.text = ""
        // Hide the cancel button
        searchBar.showsCancelButton = false
        searchBar.endEditing(true)
        Popup.Close_View()
      }

What I am trying to do is wrap that function above in another function like this

  func Selected_Location() {
        searchBarCancelButtonClicked(SearchBar)
    }

so that in my SubView Controller I can do

// SubView Controller
   let Select_Close = MainController()

   Select_Close.Selected_Location()

I am new to Swift and as stated before how can I get the searchBarCancelButtonClicked function and call it inside another function with ? I have tried doing it in several ways such as

  func Selected_Location() {
        searchBarCancelButtonClicked(_ searchBar: UISearchBar)
    }

    func Selected_Location() {
        searchBarCancelButtonClicked(searchBar)
    }

Again my SubView Controller does not have access to a UISearchBar so I am trying to call the SearchBar close function from within the SubView.

Answer 1

In Subview, keep weak reference of MainViewController, and then call one method of mainviewcontroller searchBarCancel

class MainViewController:UIViewController {
    var subViewController: SubViewController
    func searchBarCancel(){
        searchBarCancelButtonClicked(self.searchBar)
    }
    func func2(){
        subViewController.mainController = self
    }
}

class SubViewController:UIView {
    weak var mainController: MainViewController?
    func Selected_Location() {
        mainController!.searchBarCancel()
    }
}