Get the current view controller from the app delegate

Question

i am new to ios. I need to know the current view controller from app delegate.. i have no idea about this and i don't knowto implement this. i am using this code toimplemnt this but it return null values. I followed this link- Get current view controller from the app delegate (modal is possible) need help.

Answer 1

This is what I use for finding the current view controller that the user is most likely interacting with:

UIViewController+Utils.h

#import <UIKit/UIKit.h>  @interface UIViewController (Utils)  +(UIViewController*) currentViewController;  @end 

UIViewController+Utils.m

#import "UIViewController+Utils.h"  @implementation UIViewController (Utils)  +(UIViewController*) findBestViewController:(UIViewController*)vc {      if (vc.presentedViewController) {          // Return presented view controller         return [UIViewController findBestViewController:vc.presentedViewController];      } else if ([vc isKindOfClass:[UISplitViewController class]]) {          // Return right hand side         UISplitViewController* svc = (UISplitViewController*) vc;         if (svc.viewControllers.count > 0)             return [UIViewController findBestViewController:svc.viewControllers.lastObject];         else             return vc;      } else if ([vc isKindOfClass:[UINavigationController class]]) {          // Return top view         UINavigationController* svc = (UINavigationController*) vc;         if (svc.viewControllers.count > 0)             return [UIViewController findBestViewController:svc.topViewController];         else             return vc;      } else if ([vc isKindOfClass:[UITabBarController class]]) {          // Return visible view         UITabBarController* svc = (UITabBarController*) vc;         if (svc.viewControllers.count > 0)             return [UIViewController findBestViewController:svc.selectedViewController];         else             return vc;      } else {          // Unknown view controller type, return last child view controller         return vc;      }  }  +(UIViewController*) currentViewController {      // Find best view controller     UIViewController* viewController = [UIApplication sharedApplication].keyWindow.rootViewController;     return [UIViewController findBestViewController:viewController];  }  @end 

Then whenever I need the current view controller from anywhere in the app simply use:

[UIViewController currentViewController]