获取当前view的Controller

(UIViewController *)getCurrentVC{

UIViewController *currVC = nil;
UIViewController *rootvc = self.window.rootViewController;
do {
if ([rootvc isKindOfClass:[UINavigationController class]]) {//控制器为UINavigationController
UINavigationController *nav = (UINavigationController *)rootvc;
UIViewController *vc = [nav.viewControllers lastObject];
currVC = vc;
rootvc = vc.presentedViewController;

  }else if ([rootvc isKindOfClass:[UITabBarController class]]){//控制器为UITabBarController
      UITabBarController *tabVC = (UITabBarController *)rootvc;
      currVC = tabVC ;
      rootvc = [tabVC.viewControllers objectAtIndex:tabVC.selectedIndex];
      continue;
  }else {//控制器为UIViewController
      UIViewController *VC = (UIViewController *)rootvc;
      currVC = VC;
      rootvc = VC.presentedViewController;
  }

} while (rootvc != nil);
return currVC;
}