使用 NotificationCenter 将数据从 CollectionView 发送到 CollectionView 二

Question

我有一个单元格，其中包含一些属性，例如 pfp(Image) mainImage(Image) description(String) 和一个单元格中的“赞”按钮，单击“赞”后按钮，我想注册一个通知并在该通知中的 CollectionView two 上接收该通知我必须有一个完整的单元格，类似于 facebook 共享按钮，每当我共享（喜欢）一个 post，那个 post 附加在我的个人资料上，我想写相同的逻辑但我没有分享我有一个喜欢的按钮

//CollectionViewCell where like button is located
    @IBOutlet weak var profilePictureImage: UIImageView!
    @IBOutlet weak var nameLabel: UILabel!
    @IBOutlet weak var mainImage: UIImageView!
    @IBOutlet weak var desc: UILabel!
    @IBOutlet weak var logo: UIImageView!
    @IBOutlet weak var likeButton: UIButton!
    func setup(with myArray: feedPage){
        self.nameLabel.text = myArray.pfName
        self.desc.text = myArray.description
        self.profilePictureImage.image = myArray.pfp
        self.logo.image = myArray.pfp
        self.mainImage.image = myArray.mainImage
        self.likeButton.setImage(UIImage(named: "like"), for: UIControl.State.normal)
    }
    @IBAction func likeButoon(_ sender: Any) {
        NotificationCenter.default.post(name: Notification.Name("AddToFavorites"), object: nil)
        var aaa = self.nameLabel.text
    }

//CollectionViewController two where I need to recieve a notification and configure second view controller cell
var test:[String] = []
        NotificationCenter.default.addObserver(self, selector: #selector(notificationRecieved), name: Notification.Name("AddToFavorites"), object: nil)
    }
    
    @objc func notificationRecieved(){
        self.test = aaa     //error is here xcode can't find `aaa` in scope
    }

我尝试用第一个 CollectionViewCell 的值创建一个变量 aaa，然后将其放入一个数组中，但它似乎不起作用任何解决方案都会被应用如果您需要任何类型的附加信息来解决此问题，请在评论中告诉我，我会添加。谢谢。

Answer 1

您遗漏了处理通知的一些重要部分，请查看文档以更熟悉它的工作原理。

https://developer.apple.com/documentation/foundation/notificationcenter

话虽如此，您可以通过以下方法实现您想要的。

extension Notification.Name {
    static let AddToFavorites = Notification.Name("add_to_favorites")
}

class SomeView: UIView {

    @IBOutlet weak var nameLabel: UILabel!

    @IBAction func likeButoon(_ sender: Any) {
        let name = self.nameLabel.text
        // The name value must be sent with the posted notifaction, this enables observers to get the value from the received notification object.
        NotificationCenter.default.post(name: .AddToFavorites, object: name)
    }
}

class SomeController {

    init() {
        NotificationCenter.default.addObserver(self, selector: #selector(notificationRecieved), name: .AddToFavorites, object: nil)
    }

    @objc func notificationRecieved(notification: Notification){
        // Retrieve the name value from the notification object.
        guard let name = notification.object as? String else {
            return
        }
        // Do something with name
    }
}

Answer 2

有一种简单的方法可以创建易于访问的数据，通过通知中的创建变量和集合视图两个。必须有整个单元格。Facebook 等有问题

使用 NotificationCenter 将数据从 CollectionView 发送到 CollectionView 二

Sending data from CollectionView to CollectionView two with NotificationCenter

ios

notificationcenter

uicollectionview

swift