从另一个ViewController Swift

Question

我有一个ViewController，它上面有一个UIView设置，还有一个按钮可以打开另一个ViewController的popover。我想在弹出窗口控制器上设置一个按钮，将UIView设置为禁用。如何从第一个视图控制器中的第二个视图控制器中的按钮引用UIView？

修改

下面是我用来调用popover视图控制器的代码。请注意我是如何从第一个viewcontroller调用dimView.isHidden = false的。我想从popover视图控制器运行dimView.isHidden = true。

let popover = storyboard?.instantiateViewController(withIdentifier: "PopoverVC")

popover?.modalPresentationStyle = .popover
popover?.popoverPresentationController?.delegate = self as? UIPopoverPresentationControllerDelegate

popover?.popoverPresentationController?.sourceView = self.view
popover?.popoverPresentationController?.sourceRect = CGRect(x: self.view.bounds.midX, y: self.view.bounds.midY, width: 0, height: 0)

popover?.popoverPresentationController?.permittedArrowDirections = UIPopoverArrowDirection(rawValue: 0)

dimView.isHidden = false

self.present(popover!, animated: false)

编辑2：

下面是我的popover视图控制器。因为它不叫PopoverVC。我更新了答案以包含let popover = storyboard?.instantiateViewController(withIdentifier: "PopoverVC") as! PopOverViewController，但仍然没有运气。

import UIKit


var parentController:UIViewController?

class PopOverViewController: UIViewController {

    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view.
    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }


    @IBAction func closeButton(_ sender: Any) {
        self.dismiss(animated: false, completion: nil)  
    }

}

编辑3：

class ViewController: FormViewController {

    override func viewWillAppear(_ animated: Bool) {
         dimView.isHidden = true
    }

    @IBOutlet weak var dimView: UIView!

Answer 1

您可以在展示PopoverVC时向当前视图控制器传递引用，然后您可以从PopoverVC访问其视图。只需在PopoverVC中创建一个可以存储引用的属性，例如var parentController:UIViewController?

let popover = storyboard?.instantiateViewController(withIdentifier: "PopoverVC") as! PopoverViewController

popover?.modalPresentationStyle = .popover
popover?.popoverPresentationController?.delegate = self as? UIPopoverPresentationControllerDelegate

popover?.popoverPresentationController?.sourceView = self.view
popover?.popoverPresentationController?.sourceRect = CGRect(x: self.view.bounds.midX, y: self.view.bounds.midY, width: 0, height: 0)

popover?.popoverPresentationController?.permittedArrowDirections = UIPopoverArrowDirection(rawValue: 0)
popover?.dimView = self.dimView

dimView.isHidden = false

self.present(popover!, animated: false)

PopOverViewController：

class PopOverViewController: UIViewController {

    var dimView:UIView?

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

    @IBAction func closeButton(_ sender: Any) {
        self.dismiss(animated: false, completion: nil)
    }

}