UIPopoverPresentationController displaying popover as full screen

In iPhone, you should add the following in order to present a popover.

func adaptivePresentationStyleForPresentationController(controller: UIPresentationController!) -> UIModalPresentationStyle {    // Return no adaptive presentation style, use default presentation behaviour    return .None}

For Swift3/IOS10, looks like we need to do some thing like

func adaptivePresentationStyle(for controller: UIPresentationController, traitCollection: UITraitCollection) -> UIModalPresentationStyle{    return .none}

Adding this answer, in case, someone runs into this problem as i did when migrating to swift3/IOS10

For Swift3+/IOS10+, when dealing with iPhone:

You must add UIPopoverPresentationControllerDelegate the delegate at:

class YourClass:  UIViewController, UIPopoverPresentationControllerDelegate { ...

Then implement in this same parent class (which will show the popover) the method below.

func adaptivePresentationStyle(for controller: UIPresentationController, traitCollection: UITraitCollection) -> UIModalPresentationStyle{    return .none}

And then set the popover configuration below:

myPopover.modalPresentationStyle = .popovermyPopover.popoverPresentationController?.sourceRect = VIEWTOPOINTTHEARROW.framemyPopover.popoverPresentationController?.sourceView = self.viewmyPopover.popoverPresentationController?.delegate = self

Also you may set some configuration for the popover class

 class MyPopover: UIViewController { override func viewDidLoad() {    super.viewDidLoad()    //popover size    self.preferredContentSize = CGSize(width: 320, height: 200)     //sets the arrow of the popover to same color of background    self.popoverPresentationController?.backgroundColor = self.view.backgroundColor   } }