引入代理类头文件和要跳转到的界面头文件  

-（void）aaa

{

 //可以插入动画

  LYXViewControllor * view = [LYXViewControllor new];

LYXDelegate * dingDong = [UIApplacation sharedApplacation].delegate;

 

dingDong.window.rootViewControllor = view;

    

 }