swift - 从另一个 ViewController Swift 调用一个 View

Question

我有一个 ViewController，它上面设置了一个 UIView，还有一个按钮可以打开另一个 ViewController 的弹出框。我想要弹出 View Controller 上的一个按钮来将 UIView 设置为禁用。如何从第二个 View Controller 中的按钮引用第一个 View Controller 中的 UIView？

编辑:

下面是我用来调用弹出 View Controller 的代码。请注意我是如何从第一个 View Controller 调用 dimView.isHidden = false 的。我想从弹出 View Controller 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:

下面是我的弹出 View Controller 。由于它不叫 PopoverVC。我更新了答案以包括 let popover = storyboard?.instantiateViewController(withIdentifier: "PopoverVC") 作为! PopOverViewController 但还是不行。

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

您可以在呈现您的 PopoverVC 时传递对当前 View Controller 的引用，然后您可以从 PopoverVC 访问它的 View 。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)

弹出 View Controller :

class PopOverViewController: UIViewController {

    var dimView:UIView?

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

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

}