ios - 如何知道哪个 View Controller 呈现了一个 View Controller

Question

我有几个 View Controller (“来自” View Controller )连接到一个 View Controller ItemCollectionVC。
当 ItemCollectionVC 出现时，我想知道哪个 View Controller 呈现它。

如何做到这一点？

“来自” View Controller :

@IBAction func selectOpponentItems(_ sender: UIButton) {

    let VC = storyboard?.instantiateViewController(withIdentifier: "ItemCollectionVC") as! ItemCollectionVC
    VC.preferredContentSize = CGSize(width: UIScreen.main.bounds.width / 2, height: UIScreen.main.bounds.height / 1.5)
    VC.modalPresentationStyle = UIModalPresentationStyle.popover
    VC.popoverPresentationController?.sourceView = sender
    VC.popoverPresentationController?.sourceRect = sender.bounds

    self.present(VC, animated: true, completion: nil)
}

项目 View Controller :

override func viewDidLoad() {
    super.viewDidLoad()
    self.collectionView!.register(UICollectionViewCell.self, forCellWithReuseIdentifier: reuseIdentifier)
}

编辑:

我正在尝试以这种方式访问​​该属性:

 switch self.presentingViewController!.title! {
 // Error
    case "CounterBuildVC":
        dataSourceItems = counterBuildItems
    case "FreeBuildVC":
        dataSourceItems = freeBuildItems
    case "KrakenViewController":
        dataSourceItems = captureKrakenItems
    default:
        break
    }

However, it crashes with error: unexpectedly found nil, I'm sure I set the title in storyboard

Answer 1

presentingViewController UIViewController 的属性就是你要找的东西