ios - single function to dismiss all open view controllers

Ios - single function to dismiss all open view controllers

To dismiss all open view controllers in an iOS application, you typically need to traverse the view controller hierarchy and dismiss each presented view controller recursively. Here's how you can create a function that dismisses all currently presented view controllers starting from the topmost view controller:

Objective-C Implementation

If you're using Objective-C, you can define a method in your view controller or app delegate to dismiss all presented view controllers:

// In your UIViewController subclass or AppDelegate - (void)dismissAllViewControllers { UIViewController *rootViewController = UIApplication.sharedApplication.keyWindow.rootViewController; [self dismissAllPresentedViewControllersFromViewController:rootViewController]; } - (void)dismissAllPresentedViewControllersFromViewController:(UIViewController *)viewController { if (viewController.presentedViewController) { [self dismissAllPresentedViewControllersFromViewController:viewController.presentedViewController]; [viewController dismissViewControllerAnimated:NO completion:nil]; } }

Swift Implementation

For Swift, you can create an extension on UIApplication to dismiss all presented view controllers:

extension UIApplication { static func dismissAllViewControllers(animated: Bool = false, completion: (() -> Void)? = nil) { guard let rootViewController = UIApplication.shared.keyWindow?.rootViewController else { completion?() return } dismissAllPresentedViewControllers(from: rootViewController, animated: animated, completion: completion) } private static func dismissAllPresentedViewControllers(from viewController: UIViewController, animated: Bool, completion: (() -> Void)? = nil) { if let presentedViewController = viewController.presentedViewController { dismissAllPresentedViewControllers(from: presentedViewController, animated: animated) { viewController.dismiss(animated: animated, completion: completion) } } else { completion?() } } }

Usage Example

To use this function in your app, you can call UIApplication.dismissAllViewControllers() from any view controller or app delegate method:

UIApplication.dismissAllViewControllers(animated: true) { // Optional completion block print("All view controllers dismissed") }

Explanation

  • Objective-C Implementation: Uses recursion to traverse through all presented view controllers starting from the root view controller (rootViewController). It dismisses each presented view controller and continues until all are dismissed.

  • Swift Implementation: Utilizes a static function and an extension on UIApplication. It recursively dismisses all presented view controllers starting from the root view controller (rootViewController). It includes options for animation and a completion block.

Considerations

  • Animation: Adjust the animated parameter based on your app's requirements.

  • Completion Handling: Use the completion block to perform actions after all view controllers are dismissed, if needed.

  • Navigation Stack: This method dismisses presented view controllers. If you want to handle navigation controllers and their stacks differently, modify the function accordingly.

By implementing this approach, you can create a robust function to dismiss all open view controllers in your iOS application efficiently. Adjust the code to fit your specific navigation structure and use cases as necessary.

Examples

  1. iOS Swift: Dismiss All View Controllers Dismissing all currently presented view controllers from the root view controller.

    // Swift func dismissAllViewControllers() { UIApplication.shared.windows.first { $0.isKeyWindow }?.rootViewController?.dismiss(animated: true, completion: nil) }

    This function finds the root view controller and dismisses all currently presented view controllers from it.

  2. iOS Objective-C: Dismiss All View Controllers Dismissing all presented view controllers in Objective-C.

    // Objective-C - (void)dismissAllViewControllers { [[[[UIApplication sharedApplication] keyWindow] rootViewController] dismissViewControllerAnimated:YES completion:nil]; }

    This Objective-C method dismisses all currently presented view controllers starting from the root view controller.

  3. iOS Swift: Dismiss to Root View Controller Dismissing all view controllers and returning to the root view controller.

    // Swift func dismissToRootViewController() { UIApplication.shared.windows.first { $0.isKeyWindow }?.rootViewController?.dismiss(animated: true, completion: nil) }

    This Swift function dismisses all view controllers presented from the root view controller back to the root.

  4. iOS Swift: Dismiss Modal Stack Dismissing all modal view controllers in a navigation stack.

    // Swift func dismissModalStack() { if let presentingViewController = UIApplication.shared.windows.first { $0.isKeyWindow }?.rootViewController?.presentingViewController { presentingViewController.dismiss(animated: true, completion: nil) } }

    This function dismisses the entire modal stack of view controllers presented modally.

  5. iOS Swift: Dismiss Navigation Stack Dismissing all view controllers in a navigation stack.

    // Swift func dismissNavigationStack() { if let navigationController = UIApplication.shared.windows.first { $0.isKeyWindow }?.rootViewController as? UINavigationController { navigationController.dismiss(animated: true, completion: nil) } }

    This Swift method dismisses all view controllers within a navigation stack.

  6. iOS Swift: Dismiss All Presentations Dismissing all presented view controllers and modals.

    // Swift func dismissAllPresentations() { if var topViewController = UIApplication.shared.windows.first { $0.isKeyWindow }?.rootViewController { while let presentedViewController = topViewController.presentedViewController { topViewController = presentedViewController } topViewController.dismiss(animated: true, completion: nil) } }

    This function dismisses all presented view controllers and modals recursively from the top view controller.

  7. iOS Swift: Dismiss All View Controllers in Navigation Stack Dismissing all view controllers in a navigation stack except the root view controller.

    // Swift func dismissAllViewControllersInStack() { if var navigationController = UIApplication.shared.windows.first { $0.isKeyWindow }?.rootViewController as? UINavigationController { navigationController.popToRootViewController(animated: true) } }

    This Swift function pops all view controllers from the navigation stack, leaving only the root view controller.

  8. iOS Swift: Dismiss All Modals Dismissing all modally presented view controllers.

    // Swift func dismissAllModals() { if var topViewController = UIApplication.shared.windows.first { $0.isKeyWindow }?.rootViewController { while let presentedViewController = topViewController.presentedViewController { topViewController = presentedViewController topViewController.dismiss(animated: true, completion: nil) } } }

    This function dismisses all modally presented view controllers, including those presented recursively.

  9. iOS Swift: Dismiss All View Controllers in Tab Bar Dismissing all view controllers within a tab bar controller.

    // Swift func dismissAllTabBarViewControllers() { if let tabBarController = UIApplication.shared.windows.first { $0.isKeyWindow }?.rootViewController as? UITabBarController { for viewController in tabBarController.viewControllers ?? [] { viewController.dismiss(animated: true, completion: nil) } } }

    This Swift method dismisses all view controllers within a tab bar controller.

  10. iOS Swift: Dismiss View Controller Stack Dismissing all view controllers in the navigation and presenting stack.

    // Swift func dismissViewControllerStack() { if var topViewController = UIApplication.shared.windows.first { $0.isKeyWindow }?.rootViewController { while let presentedViewController = topViewController.presentedViewController { topViewController = presentedViewController } topViewController.navigationController?.popToRootViewController(animated: true) } }

    This function dismisses all view controllers in both the presenting and navigation stacks, returning to the root view controller.

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