you get top most view controller by using below method
+ (UIViewController*) topMostController
{
UIViewController *topController = [UIApplication sharedApplication].keyWindow.rootViewController;
while (topController.presentedViewController) {
topController = topController.presentedViewController;
}
return topController;
}
Or if you have navigation or UIabbar controller then use below method to get visible view controller
- (void)applicationWillResignActive:(UIApplication *)application
{
UIViewController *vc = [self visibleViewController:[UIApplication sharedApplication].keyWindow.rootViewController];
}
- (UIViewController *)visibleViewController:(UIViewController *)rootViewController
{
if (rootViewController.presentedViewController == nil)
{
return rootViewController;
}
if ([rootViewController.presentedViewController isKindOfClass:[UINavigationController class]])
{
UINavigationController *navigationController = (UINavigationController *)rootViewController.presentedViewController;
UIViewController *lastViewController = [[navigationController viewControllers] lastObject];
return [self visibleViewController:lastViewController];
}
if ([rootViewController.presentedViewController isKindOfClass:[UITabBarController class]])
{
UITabBarController *tabBarController = (UITabBarController *)rootViewController.presentedViewController;
UIViewController *selectedViewController = tabBarController.selectedViewController;
return [self visibleViewController:selectedViewController];
}
UIViewController *presentedViewController = (UIViewController *)rootViewController.presentedViewController;
return [self visibleViewController:presentedViewController];
}