本文介绍了如何从UICollectionViewCell中调用presentViewController的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
从 UIViewController 调用此函数会导致没有问题，但是从 UICollectionViewCell 调用它会引发一个前编译错误
calling this function from a UIViewController results in no problems, but calling it from a UICollectionViewCell raises a pre-compilation error
功能：
func didTapShare(sender: UIButton)
{
let textToShare = "Swift is awesome! Check out this website about it!"
if let myWebsite = NSURL(string: "http://www.google.com/")
{
let objectsToShare = [textToShare, myWebsite]
let activityVC = UIActivityViewController(activityItems: objectsToShare, applicationActivities: nil)
activityVC.excludedActivityTypes = [UIActivityTypeAirDrop, UIActivityTypeAddToReadingList]
activityVC.popoverPresentationController?.sourceView = sender
self.presentViewController(activityVC, animated: true, completion: nil)
}
}
错误：
怎么办？
推荐答案
UITableViewCell永远不应该处理任何业务逻辑。它应该在视图控制器中实现。您应该使用委托：
UITableViewCell should never handle any business logic. It should be implemented in a view controller. You should use a delegate:
UICollectionViewCell子类：
UICollectionViewCell subclass:
protocol CustomCellDelegate: class {
func sharePressed(cell: MyCell)
}
class CustomCell: UITableViewCell {
var delegate: CustomCellDelegate?
func didTapShare(sender: UIButton) {
delegate?.sharePressed(cell: self)
}
}
ViewController：
ViewController:
class TableViewController: UIViewController, UITableViewDataSource, UITableViewDelegate {
@IBOutlet weak var tableView: UITableView!
//...
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: cellIdentifier, for: indexPath) as! CustomCell
cell.delegate = self
return cell
}
}
extension TableViewController: CustomCellDelegate {
func sharePressed(cell: CustomCell) {
guard let index = tableView.indexPath(for: cell)?.row else { return }
//fetch the dataSource object using index
}
}
这篇关于如何从UICollectionViewCell中调用presentViewController的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！