UIPopoverPresentationControllerの画面回転対応メモ ref: http://qiita.com/MTattin/items/39f578610b295e9535b3

file0.swift

    ///
    /// UIPopoverPresentationControllerDelegate
    ///
    /// 画面の回転対応
    ///
    func popoverPresentationController(_ popoverPresentationController: UIPopoverPresentationController, willRepositionPopoverTo rect: UnsafeMutablePointer<CGRect>, in view: AutoreleasingUnsafeMutablePointer<UIView>) {
        let baseView = 起点としたいView
        view.pointee = baseView
        rect.pointee = baseView.bounds
        popoverPresentationController.permittedArrowDirections = UIPopoverArrowDirection.unknown
    }