An easy way to detect the topmost presented view controller on iOS

UIViewController+Detection

+ (UIViewController *)topPresentedViewController
{
    UIAppDelegate *delegate = [UIApplication sharedApplication].delegate;
    
    UIViewController *visibleViewController = delegate.keyWindow.rootViewController;
    
    while (visibleViewController.presentedViewController) {
        visibleViewController = visibleViewController.presentedViewController;
    }
    
    return visibleViewController;
}