十.在继承object的类中 如何跳转页面

一:没有导航栏的

 LoginViewController * yy=[LoginViewController new];
 UIApplication * app=[UIApplication sharedApplication];
app.keyWindow.rootViewController=yy;

二:有导航栏的

LoginViewController * yy=[LoginViewController new];
LSXNavgationViewController * nav=[[LSXNavgationViewController alloc]initWithRootViewController:yy];
UIApplication * app=[UIApplication sharedApplication];
app.keyWindow.rootViewController=nav;

三:返回想要去的页面(从根视图算起为0)

LoginViewController *yy = [self.navigationController.viewControllers objectAtIndex:2];
             
[self.navigationController popToViewController:yy animated:YES];