ios - 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（图像）mainImage（图像）description（字符串）和一个单元格中的类似按钮，单击该按钮后，我想注册一个通知并CollectionView two在该通知中接收该通知我必须有一个整个单元格，类似于 facebook 分享按钮，每当我分享（点赞）帖子时，该帖子会附加到我的个人资料中，我想编写相同的逻辑，但我有一个点赞按钮而不是分享

//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
    }

我尝试使用第一个 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，如果您需要任何类型的附加信息来解决此问题，任何解决方案都将适用，请在评论，我会补充。谢谢你。

标签： iosswiftuicollectionviewnotificationcenter

Answer 1

您缺少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
    }
}