App中最上层的UIViewController

1.第一种方法

//方法调用

UIViewController *rootVc = [self topViewControllerWithRootViewController:[[[[UIApplication sharedApplication] delegate] window] rootViewController]];

// 实际方法处理

+ (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* navigationController = (UINavigationController*)rootViewController;

return [self topViewControllerWithRootViewController:navigationController.visibleViewController];

} else if (rootViewController.presentedViewController) {

UIViewController* presentedViewController = rootViewController.presentedViewController;

return [self topViewControllerWithRootViewController:presentedViewController];

} else {

return rootViewController;

}

}

2.第二种方法

//获取Window当前显示的ViewController

+ (UIViewController*)currentViewController{UIViewController* vc =   [UIApplicationrootViewController];

while(1) {

    if([vc isKindOfClass:[UITabBarControllerclass]]) {           

         vc = ((UITabBarController*)vc).selectedViewController;       

    }

    if([vc isKindOfClass:[UINavigationControllerclass]]) {           

           vc = ((UINavigationController*)vc).visibleViewController;         

  }  

  if(vc.presentedViewController) {           

          vc = vc.presentedViewController;       

  }  else   {

      break;        }  

  }  

  returnvc;

}