Calling UIAlertController inside a UITableViewCell

问题

I am trying to call a UIAlertController from within my UITtableViewCell when my function is called. It gives me an error saying present is not available. I understand it's not within a ViewController. I am looking for an approach to access it.

override func awakeFromNib() {
    super.awakeFromNib()
    // Initialization code

    let tapGestureShareImageView = UITapGestureRecognizer(target: self, action: #selector(self.shareImageTouchUpInside))
    shareImageView.addGestureRecognizer(tapGestureShareImageView)
    shareImageView.isUserInteractionEnabled = true
}

@objc func shareImageTouchUpInside() {
    showAction()
}

func showAction() {
    let alertController = UIAlertController(title: "Action Sheet", message: "What do you like to do", preferredStyle: .alert)

    let okButton = UIAlertAction(title: "Done", style: .default, handler: { (action) -> Void in
        print("Ok button tapped")
    })

    let deleteButton = UIAlertAction(title: "Skip", style: .destructive, handler: { (action) -> Void in
        print("Delete button tapped")
    })

    alertController.addAction(okButton)
    alertController.addAction(deleteButton)

    present(alertController, animated: true, completion: nil)
}

回答1:

You can try to use delegate

protocol AlertShower{
    func showAlert(TableCustomCell)
}

class TableCustomCell: UITableViewCell {
    var delegate: AlertShower?

    @IBAction func showClicked(_ sender: UIButton) {
        self.delegate?.alertShower(sender:self)
    }
}

in the VC

class viewController: UIViewController, AlertShower {

    override func viewDidLoad() {
        super.viewDidLoad()

    }


    func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {

         let cell = areaSettTable.dequeueReusableCell(withIdentifier:CellIdentifier1) as! TableCustomCell

         cell.delegate = self

         return cell
    }

    func showAlert(sender:TableCustomCell) {

      // show alert here

    }
}

回答2:

Present is only available to ViewControllers. You are going to have to redirect the touch event to your view controller. The most common way of doing this would be having a delegate property in your UITableViewCell.

https://developer.apple.com/library/content/documentation/Swift/Conceptual/Swift_Programming_Language/Protocols.html#//apple_ref/doc/uid/TP40014097-CH25-ID276

回答3:

It's not working for me. Here is my code:

import UIKit
protocol AlertShower{
    func showAlert(_: allListsCell)
}

// prototype table cell...
class allListsCell: UITableViewCell {
    var delegate: AlertShower?
    @IBOutlet var cellSelected:    UILabel!
    var colorIndex = Int()        // point directly back to colors[]

    @IBAction func colorEditButton(_ sender: UIButton, forEvent event: UIEvent) {
        self.delegate?.alertShower(sender:self)  // ERROR...
    }
}

The error above is from the compiler:
"Value of type 'AlertShower' has no member 'alertShower'"

The rest of the code:

class tableViews: UITableViewController, AlertShower {
    func showAlert(_: allListsCell) {
    }

    func showAlert(sender:allListsCell) {

        // show alert here

    }
...
}

...help?

回答4:

I ran into a similar problem myself when creating a custom activity indicator from a subclassed UIView. What I did was create the 'show' function (in the subclass) and pass in a UIViewController parameter, like so:

public func play(inView view: UIViewController) {
//Perform action here
view.present(alertController, animated: true, completion: nil)
}

Simply call it in your view controller like so:

CustomClass.play(inView: self)

Hopefully this helps!

来源：https://stackoverflow.com/questions/49199716/calling-uialertcontroller-inside-a-uitableviewcell

标签

ios

swift

uitableview

uialertcontroller