Question

我的CollectionViewCell中有一个按钮，当按下该按钮时，我想触发UIActivityViewController（带有URL传递）。

我试图将目标（带参数）添加到CollectionViewCell中的按钮，但似乎它不起作用，这是我的代码：

  override func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {

    let cell = collectionView.dequeueReusableCell(withReuseIdentifier: verticalCellId, for: indexPath) as! VerticalCellId

    if let articleURL = self.card?[indexPath.item]._uRLAddress {

    cell.shareButton.addTarget(self, action: #selector(shareButtonPressed(sharedURL: articleURL)), for: .touchUpInside)

   }

}


  @objc func shareButtonPressed(sharedURL: String) {

    let shareText = sharedURL
    let activityViewController : UIActivityViewController = UIActivityViewController(activityItems: [shareText], applicationActivities: nil)
    activityViewController.popoverPresentationController?.sourceView = self.view
    self.present(activityViewController, animated: true, completion: nil)
}

错误是：Argument of '#selector' does not refer to an '@objc' method, property, or initializer

没有参数传递时效果很好，如下所示：

 override func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {

    let cell = collectionView.dequeueReusableCell(withReuseIdentifier: verticalCellId, for: indexPath) as! VerticalCellId

    if let articleURL = self.card?[indexPath.item]._uRLAddress {

    cell.shareButton.addTarget(self, action: #selector(shareButtonPressed), for: .touchUpInside)

   }

}

@objc func shareButtonPressed() {

    let shareText = NSLocalizedString("Share our app with friends.", comment: "share")
    let activityViewController : UIActivityViewController = UIActivityViewController(activityItems: [shareText], applicationActivities: nil)
    activityViewController.popoverPresentationController?.sourceView = self.view
    self.present(activityViewController, animated: true, completion: nil)
}

任何建议都将不胜感激。

Answer 1

您无法在目标/操作选择器中传递任意参数。

支持的表格是

无参数
一个参数必须是操作的发件人（shareButtonPressed(_ sender: UIButton)）
某些UIControl项还允许额外的UIControlEvents参数。

无法在CollectionViewCell按钮（Swift 4）中添加带参数的目标

1 个答案: