如何确定调用视图 controller？

Question

I made a drawer with two sections.. therefore I implemented a delegate pattern to access a embedded tableView inside of my container .

class Drawer: UIViewController, DrawerTableViewDelegate {

    var drawerVC : DrawerTableView?

    override func viewDidLoad() {
        super.viewDidLoad()      
    }

    override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
      if segue.identifier == "tableViewSegue" {
        self.drawerVC = (segue.destination as! DrawerTableView
        self.drawerVC!.delegate = self
        }

    }

In my DrawerTableView class is the delegate implemented and also some code to access the rows in the tableView :

class MenuTableViewController: UITableViewController {

    var delegate : MenuTableViewControllerDelegate?
//tableview delegate

The drawer gets called in two scenes in the same way:

@objc func didTapRowInDrawer(_ sender: UIBarButtonItem) {
        guard let drawerVC = storyboard?.instantiateViewController(withIdentifier: "DrawerCtrl") as? Drawer else { return }
        drawerVC.modalPresentationStyle = .overCurrentContext
        drawerVC.transitioningDelegate = self
present(drawerVC, animated: true)
    }

Can I determine the calling ViewController of my drawer ?

I thought of something like

if segue.source is VC {
   //do something
} else if segue.source is VC2 {
  // do something else
}

in Drawer::prepare

Answer 1

From the code, it looks like the Drawer was presented as a Modal. The viewController which presented a Modal is stored in presentingViewController variable. You can use the below code in the DrawerViewController to determine which ViewController had presented the Drawer.

if let presentingVC = self.presentingViewController {
    if presentingVC.isKind(of: VC1.self) {
          //do something
    } else if presentingVC.isKind(of: VC2.self) {
         // do something else
    }
 }