如何创建AppDelegate到第三方框架桥文件

I have a project written in Objective C, new features are written in Swift 3.1 My requirement is accessing a variable declared in AppDelegate.h file. So I import AppDelegate in my bridge file. now I can declare Appdelegate Object in my Swift class file and also access variables declared in Appdelegate.I have a project written in Objective C, new fe