swift - PopOverViewController: Wrong alignment of the top arrow -

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i use popoverviewcontroller in swift application show dat when button pressed. button clickable black line can see in attached picture.

the problem top arrow (i'm not sure how should call it?) popoverviewcontroller should right under black button.

top arrow (?) should under current button

here function of display popoverviewcontroller: 

@ibaction func btnshowmoretapped(_ sender: anyobject) {     let vc = storyboard?.instantiateviewcontroller(withidentifier: "popoverviewcontroller") as! popoverviewcontroller     vc.preferredcontentsize = cgsize(width: uiscreen.main.bounds.width - (uiscreen.main.bounds.width / 5), height: 310)       let navcontroller = uinavigationcontroller(rootviewcontroller: vc)     navcontroller.modalpresentationstyle = .popover     navcontroller.isnavigationbarhidden = true      let viewforsource = sender as! uiview      let popmenu = navcontroller.popoverpresentationcontroller     popmenu?.delegate = self     popmenu?.sourceview = viewforsource      present(navcontroller, animated: true, completion: nil) }

is there way can fix problem? hope explained problem can understand problem.


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