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;

}