我在 iOS 11 中有一个键盘扩展，其中包含来自 JSON 的文章的 Collection View 。我在原型(prototype)单元格中有一个按钮，我想让用户按下它以在键盘外部的 Safari 中打开文章。我可以让它打开静态 URL 中的所有链接，但我无法让它打开每篇文章的 URL。我错过了什么？
我已经给出了一个工作简单的静态 Action 的例子，还包括了我已经尝试过但在这段代码中不起作用的东西:
func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
if(collectionView == self.key.colImages)
{
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "gifCollectionViewCell", for: indexPath) as! gifCollectionViewCell
cell.lblTitle.text = self.articles[indexPath.row].headline
let prefix: String = "https://res.cloudinary.com/djvbbwrnm/image/fetch/"
let options: String = "w_0.2/"
if let imageURL = self.articles[indexPath.row].imageURL
{
let articleURL = self.articles[indexPath.row].url
let url = URL(string: articleURL!)
let urlAppended = prefix+options+imageURL
cell.imgView.sd_setImage(with: URL(string: urlAppended), completed: nil)
//This works
cell.shareButton.addTarget(self, action: #selector(openLink), for: .touchUpInside)
//This doesn't
cell.shareButton.addTarget(self, action: #selector(openUrl(url: url)), for: .touchUpInside)
}
return cell
}
else
{
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "catCollectionViewCell", for: indexPath) as! catCollectionViewCell
cell.imgView.image = buttPics[indexPath.row]
cell.imgView.layer.cornerRadius = 2
cell.imgView.layer.masksToBounds = true
return cell
}
}
@objc func openLink(){
let articleURL = "http://google.com"
let url = URL(string: articleURL)
openUrl(url: url)
}
@objc func openUrl(url: URL?) {
let selector = sel_registerName("openURL:")
var responder = self as UIResponder?
while let r = responder, !r.responds(to: selector) {
responder = r.next
}
_ = responder?.perform(selector, with: url)
}
最佳答案
您不能添加任何其他 DataTypes 作为参数。因为，您正在为 UIButton 添加 addTarget。
@objc func openLink(){
}
@objc func openLink(sender: UIButton){ // URL is not possible.
}
以上两段代码相同。在第二个中，您可以访问 UIButton 的 property。
可运行代码
func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
if(collectionView == self.key.colImages)
{
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "gifCollectionViewCell", for: indexPath) as! gifCollectionViewCell
cell.lblTitle.text = self.articles[indexPath.row].headline
let prefix: String = "https://res.cloudinary.com/djvbbwrnm/image/fetch/"
let options: String = "w_0.2/"
if let imageURL = self.articles[indexPath.row].imageURL
{
//let articleURL = self.articles[indexPath.row].url
//let url = URL(string: articleURL!)
let urlAppended = prefix+options+imageURL
cell.imgView.sd_setImage(with: URL(string: urlAppended), completed: nil)
//This works
cell.shareButton.addTarget(self, action: #selector(openLink), for: .touchUpInside)
//This doesn't
//cell.shareButton.addTarget(self, action: #selector(openUrl(url: url)), for: .touchUpInside)
cell.shareButton.tag = indexPath.row // SET TAG TO UIBUTTON
}
return cell
}
else
{
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "catCollectionViewCell", for: indexPath) as! catCollectionViewCell
cell.imgView.image = buttPics[indexPath.row]
cell.imgView.layer.cornerRadius = 2
cell.imgView.layer.masksToBounds = true
return cell
}
}
@objc func openLink(sender: UIButton){ // USE THIS.
let buttonTag : Int = sender.tag
let articleURL = self.articles[buttonTag].url
let url = URL(string: articleURL!)
// You can achieve by this way.
// Since I am in a keyboard extension, I added the follwoing code and it is working now.
let selector = sel_registerName("openURL:")
var responder = self as UIResponder?
while let r = responder, !r.responds(to: selector) {
responder = r.next
}
_ = responder?.perform(selector, with: url)
}
关于ios - 将目标添加到 Collection View Nib 内的按钮操作，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/48621206/