ios 获取当前ViewController

- (UIViewController*)getpresentVC:(UIWindow *)window{
if ([window.rootViewController class]==[UITabBarController class]) {
UITabBarController *tabBarController = (UITabBarController*)window.rootViewController;
UINavigationController *navi = [tabBarController.viewControllers lastObject];
NSLog(@"%d",navi.viewControllers.count);
UIViewController *VC =[navi.viewControllers lastObject];
if (!VC.presentedViewController) {
return VC.presentedViewController;
}else{
return VC;
}
}else{
return window.rootViewController;
}
}

- (UIViewController*)topViewController {
return [self topViewControllerWithRootViewController:[UIApplication sharedApplication].keyWindow.rootViewController];
}
- (UIViewController*)topViewControllerWithRootViewController:(UIViewController*)rootViewController {

if ([rootViewController isKindOfClass:[UITabBarController class]]) {

UITabBarController* tabBarController = (UITabBarController*)rootViewController;
return [self topViewControllerWithRootViewController:tabBarController.selectedViewController];
} else if ([rootViewController isKindOfClass:[UINavigationController class]]) {
UINavigationController* nav = (UINavigationController*)rootViewController;
return [self topViewControllerWithRootViewController:nav.visibleViewController];
} else if (rootViewController.presentedViewController) {
UIViewController* presentedViewController = rootViewController.presentedViewController;
return [self topViewControllerWithRootViewController:presentedViewController];
} else {
return rootViewController;
}
}