Swift: Popover dismiss callback

Question

There are two UIViewConrollers in my Storyboard: MainViewController and SecondViewController. I'm going to show SecondViewController as a popover when user taps a button called Show Popover:

//MainViewController
override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?)
{

    if segue.identifier == "GoToSecondViewControllerSegue"
    {
        var vc = segue.destinationViewController as! SecondViewController
        var controller = vc.popoverPresentationController

        if controller != nil
        {
            controller?.delegate = self
            vc.inputTextDelegate = "I'm a popover!"
        }
    }
}

func popoverPresentationControllerDidDismissPopover(popoverPresentationController: UIPopoverPresentationController) {
     println("done")
}

func adaptivePresentationStyleForPresentationController(controller: UIPresentationController) -> UIModalPresentationStyle
{
    return .None
}

//SecondViewController
@IBAction func dismissPopover(sender: UIButton) {
     dismissViewControllerAnimated(true, completion: nil)
     //This dismisses the popover but does not notify the MainViewConroller
}

The anchor of segue is connected to a button:

Now I have two problems:

When I tap the cancel button inside the popover it dismisses the popover but does not trigger popoverPresentationControllerDidDismissPopover inside the MainViewController
How can I pass data from the SecondViewController to the MainViewController, text value of a UITextView for example.

score 15 · Answer 1 · answered Oct 21 '16 at 00:09

15

Or, more simply, just call iOS's delegate method manually when you dismiss the popover manually.

    dismissViewControllerAnimated(true, completion: nil)
    popoverPresentationController?.delegate?.popoverPresentationControllerDidDismissPopover?(popoverPresentationController!)

answered Oct 21 '16 at 00:09

Luke Bartolomeo

551
7
11

Easiest solution when you are doing almost everything programmatically – Sep 05 '17 at 08:34
Simple one liner that works as expected. Thanks Luke! – JackyW Dec 06 '17 at 07:21

score 11 · Answer 2 · edited Jun 20 '19 at 21:57

11

You need to set yourself as the popOverDelegate. You have to do this in the popoverPresentationController of the destination.

override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
    segue.destination.popoverPresentationController?.delegate = self
}

Then declare implement the delegates in your ViewController:

extension FormViewController: UIPopoverPresentationControllerDelegate {

    func popoverPresentationControllerDidDismissPopover(_ popoverPresentationController: UIPopoverPresentationController) {
        printBreadcrumb("Dismissed popover")
    }

}

edited Jun 20 '19 at 21:57

Keara

589
1
6
17

answered Nov 07 '16 at 09:46

doozMen

690
1
7
14

`popoverPresentationControllerDidDismissPopover` is deprecated as of iOS 13 and has been replaced by `presentationControllerDidDismiss`. – alstr Dec 14 '21 at 17:06

score 8 · Accepted Answer · answered Aug 15 '15 at 04:59

Protocols and delegations are solution to such problems. In my case I defined a protocol and conformed the MainViewController to the protocol.

//SecondViewController
protocol MyDelegate{
    func DoSomething(text:String)
}

class SecondViewController: UIViewController {

 var delegate:GetTextDelegate?

 var inputTextDelegate:String = ""

 override func viewDidLoad() {
    newText.text = inputTextDelegate
 }

 @IBAction func dismissPopover(sender: UIButton) {
        dismissViewControllerAnimated(true, completion: nil)
       //This dismisses the popover but does not notify the  MainViewConroller
 }
 @IBAction func doneButtonAction(sender: UIButton) {
    if let delegate = self.delegate {
        delegate.DoSomething(newText.text)
        self.dismissViewControllerAnimated(true, completion: nil)
    }
 }
}

class MainViewController: UIViewController, UIPopoverPresentationControllerDelegate, MyDelegate {


    override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?)
    {

        if segue.identifier == "GoToSecondViewControllerSegue"
        {
            var vc = segue.destinationViewController as! SecondViewController
            vc.delegate = self
            vc.inputTextDelegate = "I'm a popover!"
        }
    }

    func popoverPresentationControllerDidDismissPopover(popoverPresentationController: UIPopoverPresentationController) {
        //...
    }

 func DoSomething(text: String) {
     //Do whatever you want
     println(text)
 }

}

You need to set yourself as the delegate. See my answer. – doozMen Nov 07 '16 at 09:47 — doozMen, Nov 07 '16 at 09:47

score -1 · Answer 4 · answered Jul 11 '16 at 03:25

I have the same problem and find the answer in Apple API.

About the function popoverPresentationControllerDidDismissPopover, they say The popover presentation controller calls this method after dismissing the popover to let you know that it is no longer onscreen. The presentation controller calls this method only in response to user actions. It does not call this method if you dismiss the popover programmatically.

So we have to do it ourselves.

You can choice a block or a delegate like @Maysam did which is more heavy. Here's my way to use a block FYI.

Let's just focus on key functions.

class SecondViewController: UIViewController {

var dismissPopover: (() -> Void)?

deinit {
    if let block = self.dismissPopover {
        block()
    }
}

 @IBAction func dismissPopover(sender: UIButton) {
        dismissViewControllerAnimated(true, completion: nil)
       //This dismisses the popover but does not notify the  MainViewConroller
 }
}

I made a block, and call it well secondVC deinit.

class MainViewController: UIViewController, UIPopoverPresentationControllerDelegate, MyDelegate {


    override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?)
    {

        if segue.identifier == "GoToSecondViewControllerSegue"
        {
            var vc = segue.destinationViewController as! SecondViewController
            vc..dismissPopover = {
                [unowned self] () in
                self.DoSomehing()
                // call your method...
            }
        }
    }


 func DoSomething(text: String) {
     //Do whatever you want
     println(text)
 }

}

Set up the block in prepareForSegue: method, and Done.

Swift: Popover dismiss callback

4 Answers4

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