如何使用通知中心将数据从第三个 viewcontroller 向后移动到第一个 viewcontrlloer？

Question

我有 3 个视图控制器。我已经将对象从第一个传递到第二个，从第二个传递到第三个 viewcontroller，现在在第三个 viewcontroller 中编辑一些数据，并尝试使用通知中心将更新的数据对象发送回第一个 viewcontroller。但是我不确定我应该如何或使用哪种方法来 post 可以将数据对象传递给第一个 viewcontrller 的通知。

现在我尝试如下

    // third view controller 
    import UIKit

    protocol editContactDelegate: AnyObject {
        func updateContact(contact: Contact)
    }

    class EditViewController: UIViewController {

        @IBOutlet weak var lblName: UILabel!
        @IBOutlet weak var lblPhoneNumber: UILabel!
        @IBOutlet weak var lblEmailID: UILabel!



        var editContact: Contact?

        weak var delegate: editContactDelegate?

        override func viewDidLoad() {
            super.viewDidLoad()

            // Do any additional setup after loading the view.

            lblName.text = editContact?.name
            lblPhoneNumber.text = editContact?.phone
            lblEmailID.text = editContact?.email

        }

        @IBAction func editContact(_ sender: AnyObject) {


///??? which method should i use to post object 
         NotificationCenter.default.post(name: NSNotification.Name("Test"), object: Contact(name: "abc", position: "xyz", email: "updated@gmail.com", phone: "updated number"))
        }

    }

//////////

// first view controller 

class ViewController: UIViewController, UITableViewDelegate, UITableViewDataSource, editContactDelegate {
    func updateContact(contact: Contact) {
        print(contact.email)
    }


    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view.
        self.tableview.delegate =  self
        self.tableview.dataSource = self

        tableview.register(UINib(nibName: "ContactCell", bundle: nil), forCellReuseIdentifier: "ContactCell")

       NotificationCenter.default
            .addObserver(self,
                         selector:#selector(NotificationAct(_:)),
                         name: NSNotification.Name ("Test"),                                          object: nil)

    }


    @objc func NotificationAct(_ notification: NSNotification) {

        var abc = notification. // how to get object from third viewcontroller ???

    }
}

Answer 1

你需要

let abc = notification.object as! Contact

如何使用通知中心将数据从第三个 viewcontroller 向后移动到第一个 viewcontrlloer？

How to move data backward from third viewcontroller to first viewcontrlloer using notification center?

ios

swift

notificationcenter