Presenting a Uialertcontroller Properly on an iPad Using iOS 8

Presenting a UIAlertController properly on an iPad using iOS 8

You can present a UIAlertController from a popover by using UIPopoverPresentationController.

In Obj-C:

UIViewController *self; // code assumes you're in a view controller
UIButton *button; // the button you want to show the popup sheet from

UIAlertController *alertController;
UIAlertAction *destroyAction;
UIAlertAction *otherAction;

alertController = [UIAlertController alertControllerWithTitle:nil
                                                      message:nil
                           preferredStyle:UIAlertControllerStyleActionSheet];
destroyAction = [UIAlertAction actionWithTitle:@"Remove All Data"
                                         style:UIAlertActionStyleDestructive
                                       handler:^(UIAlertAction *action) {
                                           // do destructive stuff here
                                       }];
otherAction = [UIAlertAction actionWithTitle:@"Blah"
                                       style:UIAlertActionStyleDefault
                                     handler:^(UIAlertAction *action) {
                                         // do something here
                                     }];
// note: you can control the order buttons are shown, unlike UIActionSheet
[alertController addAction:destroyAction];
[alertController addAction:otherAction];
[alertController setModalPresentationStyle:UIModalPresentationPopover];

UIPopoverPresentationController *popPresenter = [alertController 
                                              popoverPresentationController];
popPresenter.sourceView = button;
popPresenter.sourceRect = button.bounds;
[self presentViewController:alertController animated:YES completion:nil];

Editing for Swift 4.2, though there are many blogs available for the same but it may save your time to go and search for them.

if let popoverController = yourAlert.popoverPresentationController {
    popoverController.sourceView = self.view //to set the source of your alert
    popoverController.sourceRect = CGRect(x: self.view.bounds.midX, y: self.view.bounds.midY, width: 0, height: 0) // you can set this as per your requirement.
    popoverController.permittedArrowDirections = [] //to hide the arrow of any particular direction
}

Swift UIAlertController - ActionSheet iPad iOS8 Crashes

The error message is telling you that you need to give the alert controller's popoverPresentationController a location so that it can position itself properly. This is easy to do -- just check to see if there's a popover controller and add the sender as the source.

If your button is a UIBarButtonItem:

if let popoverController = alertController.popoverPresentationController {
    popoverController.barButtonItem = sender
}
self.presentViewController(alertController, animated: true, completion: nil)

Otherwise:

if let popoverController = alertController.popoverPresentationController {
    popoverController.sourceView = sender
    popoverController.sourceRect = sender.bounds
}
self.presentViewController(alertController, animated: true, completion: nil)

Present a UIAlertController from within a Popover in iOS8

Found it !
If this AlertController is presented inside a popover, it must provide the location information, either a sourceView and sourceRect, or a barButtonItem.

Like

resetWarning.popoverPresentationController?.sourceView = selectedCell?.contentView
resetWarning.popoverPresentationController?.sourceRect = selectedCell!.contentView.frame

My code had to look like that:

    override func tableView(tableView: UITableView, didSelectRowAtIndexPath indexPath: NSIndexPath) {

    var previouslySelectedCell: UITableViewCell?
    if checkedIndexPath != nil {
        previouslySelectedCell = tableView.cellForRowAtIndexPath(checkedIndexPath)
    }
    var selectedCell = tableView.cellForRowAtIndexPath(indexPath)

    let selectedCurrency = PortfolioCurrencyStore.sharedStore.allCurrencies[indexPath.row]

    if selectedCurrency.symbol != GlobalSettings.sharedStore.portfolioCurrency {

        // Warning : changing the portfolio currency will reset the portfolio
        var resetWarning = UIAlertController(title: NSLocalizedString("Currency Picker VC:AS title", comment: "Changing currency will reset portfolio"), message: nil, preferredStyle: .ActionSheet)

        // destructive button
        let resetAction = UIAlertAction(title: NSLocalizedString("Currency Picker VC:AS destructive", comment: "Destructive button title"), style: .Destructive, handler: { (action: UIAlertAction!) in

            // Remove checkmark from the previously marked cell
            previouslySelectedCell?.accessoryType = .None

            // Add checkmark to the selected cell
            selectedCell?.accessoryType = .Checkmark
            self.checkedIndexPath = indexPath

            // Animate deselection of cell
            self.tableView.deselectRowAtIndexPath(indexPath, animated:true)

            // Stock the portfolio currency as NSUserDefaults
            GlobalSettings.sharedStore.portfolioCurrency = selectedCurrency.symbol // link between portfolioCurrency as a String and currency.symbol as the property of a Currency instance.

            // Delete all items from the StockStore
            StockStore.sharedStore.removeAllStocks()
            println("StockStore : all entries were deleted")

            // Delete all items from the CurrencyRateStore
            CurrencyRateStore.sharedStore.deleteAllRates()
            println("CurrencyStore : all entries were deleted")

            // Delete all items from the SalesJournal
            SalesJournal.sharedStore.removeAllEntries()
            println("SalesJournal : all Sales journal entries were deleted")


            // Reload tableView
            self.tableView.reloadData()

            // On Regular sizes, the currency picker is presented inside a popover : reloadData of the List View
            NSNotificationCenter.defaultCenter().postNotificationName("CurrencyPickerVC_PortfolioCurrencyDidChangeNotification", object:nil, userInfo:nil)

            // Animate deselection of cell
            tableView.deselectRowAtIndexPath(indexPath, animated:true)

            // Return to root VC
            self.navigationController?.popToRootViewControllerAnimated(true)

            })



        // cancel button
        let cancelAction = UIAlertAction(title: NSLocalizedString("Currency Picker VC:AS cancel", comment: "Cancel button title"), style: .Cancel, handler: { (alertAction: UIAlertAction!) -> Void in
            // Animate deselection of cell
            self.tableView.deselectRowAtIndexPath(indexPath, animated:true)
        })

        resetWarning.addAction(resetAction)
        resetWarning.addAction(cancelAction)

        // If this AlertController is presented inside a popover, it must provide the location information, either a sourceView and sourceRect or a barButtonItem.
        resetWarning.popoverPresentationController?.sourceView = selectedCell?.contentView
        resetWarning.popoverPresentationController?.sourceRect = selectedCell!.contentView.frame

        presentViewController(resetWarning, animated: true, completion: nil)


    } else {
        // Animate deselection of cell
        tableView.deselectRowAtIndexPath(indexPath, animated:true)
    }
}

Now the image looks like this:

UIAlertController shown on iPhone, not on iPad

If you look at the documentation for the sourceView property (https://developer.apple.com/documentation/uikit/uipopoverpresentationcontroller/1622313-sourceview), you see that it is defined as "The view containing the anchor rectangle for the popover."

This means that your popover is appearing off screen, since the anchor rectangle is the view itself.

To fix this, try modify the sourceRect property as well. Here's an example:

alertController.popoverPresentationController.sourceRect = CGRectMake(CGRectGetMidX(self.view.bounds), CGRectGetMidY(self.view.bounds), 1, 1);

You will see that this causes the alert to appear in the middle of the view.

Action Sheet is not working in ipad ios 13.6

I have tried your code on iPhone(Device:- iPhone 11 Pro 13.6) and iPad(iPad pro (12.9- 4th generation) both and it works. But If you said, I have changed some popover frame, Use the following code:-

   let alert = UIAlertController(title: "Select Image", message: nil, preferredStyle:
    UIAlertController.Style.actionSheet)
       alert.addAction(UIAlertAction(title: "Camera", style: UIAlertAction.Style.default,
    handler: { (res) in
        self.btnClickedCamera(tag:2)
    }))
    alert.addAction(UIAlertAction(title: "Gallery", style: UIAlertAction.Style.default,
    handler: { (res) in
       self.btnClickedGallery(tag:2)
    }))
    alert.addAction(UIAlertAction(title: "Cancel", style: .cancel, handler: { (res) in

    }))
    if let popoverPresentationController = alert.popoverPresentationController {

        popoverPresentationController.sourceRect = sender.frame
        popoverPresentationController.sourceView = self.view

    }
    self.present(alert, animated: true, completion: nil)

}

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