版本：swift3.0
@IBAction func buttonOnClick(_ sender: UIButton) {
//要彈出的視圖控制器
let viewCtrl = UIViewController()
//彈出視圖大小
viewCtrl.preferredContentSize = CGSize(width: 250, height: 250)
viewCtrl.modalPresentationStyle = .popover
let popover = viewCtrl.popoverPresentationController
//彈出視圖的位置
popover?.sourceRect = sender.frame
//代理：UIPopoverPresentationControllerDelegate
popover?.delegate = self
//彈出頁面是相對于誰
popover?.sourceView = self.view
//箭頭的指向
popover?.permittedArrowDirections = .up
//如果是tabBarItem彈出胁后，則應(yīng)該這樣設(shè)置：
//popover.barButtonItem = sender
present(viewCtrl, animated: true, completion: nil)
}
func adaptivePresentationStyle(for controller: UIPresentationController) -> UIModalPresentationStyle {
return UIModalPresentationStyle.none
}
屏幕快照 2017-03-03 下午1.08.24.png
