how to center a popoverview in swift

You need to provide the source rect for the popover.

From the apple documentation: the source rect is the rectangle in the specified view in which to anchor the popover. Use this property in conjunction with the sourceView property to specify the anchor location for the popover.

In your case, under

_popoverPresentationController.sourceView = self.view;

add:

_popoverPresentationController.sourceRect = CGRectMake(CGRectGetMidX(self.view.bounds), CGRectGetMidY(self.view.bounds),0,0)

It will do the trick!

Here's an implementation using Swift 3

let popover = storyboard?.instantiateViewController(withIdentifier: "popover") as! PopoverVC    popover.modalPresentationStyle = UIModalPresentationStyle.popover    popover.popoverPresentationController?.backgroundColor = UIColor.green    popover.popoverPresentationController?.delegate = self    popover.popoverPresentationController?.sourceView = self.view    popover.popoverPresentationController?.sourceRect = CGRect(x: self.view.bounds.midX, y: self.view.bounds.midY, width: 0, height: 0)    popover.popoverPresentationController?.permittedArrowDirections = UIPopoverArrowDirection(rawValue: 0)    self.present(popover, animated: true)

Based on Istvan'sanswer

Swift 4 implementation :

popover.popoverPresentationController?.sourceRect = CGRect(x: view.center.x, y: view.center.y, width: 0, height: 0)popover.popoverPresentationController?.sourceView = viewpopover.popoverPresentationController?.permittedArrowDirections = UIPopoverArrowDirection(rawValue: 0)