Swift UIAlertController -> ActionSheet iPad iOS8 Crashes

Question

currently i\'m running into big trouble with my ActionSheet. On iPhone it works great, but on iPad it only crashes

I create a new project with only one button

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Answer 1

Nate Cook is totally right however I would do it so I detect if it is iPad or iPhone.

This is for barButtonItem:

if ( UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiom.pad ){

            if let currentPopoverpresentioncontroller = alertController.popoverPresentationController{
                currentPopoverpresentioncontroller.barButtonItem = sender as! UIBarButtonItem
                currentPopoverpresentioncontroller.permittedArrowDirections = UIPopoverArrowDirection.down;
                self.present(alertController, animated: true, completion: nil)
            }
        }else{
            self.present(alertController, animated: true, completion: nil)
        }

Answer 2

If you want to present it in the centre with no arrows on iPads [Swift 3+]:

    if let popoverController = alertController.popoverPresentationController {
        popoverController.sourceView = self.view
        popoverController.sourceRect = CGRect(x: self.view.bounds.midX, y: self.view.bounds.midY, width: 0, height: 0)
        popoverController.permittedArrowDirections = []
    }
    self.present(alertController, animated: true, completion: nil)

Answer 3

If you want show your alert in center and no arrow, I tryed this, it works on iOS 11.2

swift 4.2 version:

let actionSheet = UIAlertController ......
if ( UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiom.pad ){

        if let currentPopoverpresentioncontroller = actionSheet.popoverPresentationController{
            currentPopoverpresentioncontroller.permittedArrowDirections = []
            currentPopoverpresentioncontroller.sourceRect = CGRect(x: (self.view.bounds.midX), y: (self.view.bounds.midY), width: 0, height: 0)
            currentPopoverpresentioncontroller.sourceView = self.view
            self.present(actionSheet, animated: true, completion: nil)
        }
    }else{
        self.present(actionSheet, animated: true, completion: nil)
    }

Objective C version:

UIAlertController* actionSheet 
if (UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPad) {
    NSArray *empty;
    UIPopoverPresentationController *currentPopOverPresentationController = [actionSheet popoverPresentationController];
    currentPopOverPresentationController.permittedArrowDirections = empty;
    currentPopOverPresentationController.sourceRect = CGRectMake(CGRectGetMidX(self.view.bounds), CGRectGetMidY(self.view.bounds), 0, 0);
    currentPopOverPresentationController.sourceView = self.view;

    [self presentViewController:actionSheet animated:YES completion:nil];
}else{
    [self presentViewController:actionSheet animated:YES completion:nil];
}

Answer 4

To follow up on Nate Cook's answer. If your button is a UIBarButtonItem it may be necessary to perform casting on sender.

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

Answer 5

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)

Answer 6

try this

alertController.popoverPresentationController?.sourceView = self.view