STPopup provides STPopupController, which works just like UINavigationController in popup style, for both iPhone and iPad. It's written in Objective-C and compatible with Swift.
Fixed #59 #60: navigationItem.titleView is not loaded on iOS 8.
Support IBInspectable for contentSizeInPopup and landscapeContentSizeInPopup, now you can set the content size in interface builder or storyboard.
Tested in two projects, stable enough.