segues的类型

Name	Interface Builder symbol	Description
Show		Present the content in the detail or master area depending on the content of the screen. If the app is displaying a master and detail view, the content is pushed onto the detail area. If the app is only displaying the master or the detail, the content is pushed on top of the current view controller stack.
Show Detail		Present the content in the detail area. If the app is displaying a master and detail view, the new content replaces the current detail. If the app is only displaying the master or the detail, the content replaces the top of the current view controller stack. The symbol is the same as the one for a Show segue.
Present Modally		Present the content modally. Choose a presentation style (UIModalPresentationStyle) or a transition style (UIModalTransitionStyle).
Present as Popover		Present the content as a popover anchored to an existing view. Specify the possible directions of the arrow shown on one edge of the popover view (UIPopoverArrowDirection), and specify the anchor view.
Custom		Create your own behaviors by using a custom segue.
Push (Deprecated)		Present the content by pushing it onto the current stack of view controllers. The symbol is the same as the one for a Show segue.
Modal (Deprecated)		Present the content modally on top of the existing screen. The options are the same as Present Modally.
Popover (Deprecated)		Present the content as a popover. The options are the same as Present as Popover.
Replace (Deprecated)		Replace the top view controller on the screen with the new content.