获取当前控制器push到下个VC - iOS

收到推送跳到指定页面会用到

// 取到tabbarcontroller
UITabBarController *tabBarController = (UITabBarController*)self.window.rootViewController;
// 取到navigationcontroller
UINavigationController * navgationcontroller = (UINavigationController *)tabBarController.selectedViewController;

UIViewController *viewcontroller = [[UIViewController alloc]init];

[navgationcontroller pushViewController:viewcontroller animated:YES];