通知中心无法收到通知

Question

我在Collection View Cell里面有一个按钮每当一个人点击这个按钮时，我想注册一个通知，创建变量name并将其值设置为单元格的属性nameLabel，之后我想将该通知发送给我的第二个Collection View并将Collection View的单元格nameLabel.text设置为我从第一个Collection View发送的name字符串

如果你需要任何额外的代码，请在评论中告诉我

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

// button inside first collection view cell
@IBAction func likeButoon(_ sender: Any) {
print("Button works fine")
let name = self.nameLabel.text    // first collection view cell's property nameLabel
NotificationCenter.default.post(name: .AddToFavorites, object: name)
}

// second collection view controller
var string1:String = ""
override func viewDidLoad() {
super.viewDidLoad()
NotificationCenter.default.addObserver(self, selector: #selector(notificationRecieved), name: .AddToFavorites, object: nil)
}
@objc func notificationRecieved(notification: Notification){
guard let name = notification.object as? String else {
return
}
string1 = name
}
func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
let cell = collectionViewFavorites.dequeueReusableCell(withReuseIdentifier: "favoritesCell", for: indexPath) as? CollectionViewCellFavorites
cell?.nameLabel.text = string1        // Second collection view cell's property nameLabel
return cell!
}

Answer 1

你需要刷新

string1 = name
collectionView.reloadData()