         return notice
     }
     
+    @discardableResult
     open class func position(_ position: NoticePosition) -> NavigationNotice {
         let notice = NavigationNotice()
         notice.noticeViewController.position = position

    }
    
    /// Set on the status bar of notification.
    open class func onStatusBar(_ on: Bool) -> NavigationNotice {
        let notice = NavigationNotice()
        notice.onStatusBar = on

    }
    
    /// Add content to display.
    @discardableResult
    open class func addContent(_ view: UIView) -> NavigationNotice {
        let notice = NavigationNotice()
        notice.noticeViewController.setContent(view)
