Navigating Back to the Root View-Controller in iOS from a Modally Presented View-Controller

Описание: Learn how to navigate effortlessly back to the root view-controller in iOS applications using Swift. Find step-by-step guidance and code examples to simplify your app navigation!
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This video is based on the question https://stackoverflow.com/q/68320282/ asked by the user 'Angel' ( https://stackoverflow.com/u/5002113/ ) and on the answer https://stackoverflow.com/a/68320443/ provided by the user 'Tarun Tyagi' ( https://stackoverflow.com/u/6458001/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Navigating Back to the Root View-Controller from a Modally Presented View-Controller in iOS

When developing iOS applications, navigation between different view controllers is a key aspect that significantly affects user experience. Often, you may encounter situations where your application pushes a view controller (let's call it B) and then presents another one modally (let's call it C). In these cases, it can become challenging to navigate back to the root view-controller (A) from the presented controller (C). In this guide, we will explore how to achieve just that using Swift.

Understanding the View Controller Hierarchy

To grasp the solution better, let's visualize the relationship between the view controllers involved in this scenario:

Root View Controller (A): This is the main view controller of your app.

Pushed View Controller (B): This controller is pushed onto the navigation stack from A.

Presented View Controller (C): This is a modally presented controller from B.

The typical navigation flow is:

From A to B (using pushViewController).

From B to C (using presentViewController).

Now, the tricky part is navigating from C back to A.

Solution: Code Implementation

You can implement this navigation in your view controller C by using the following Swift code snippet:

[[See Video to Reveal this Text or Code Snippet]]

Breakdown of the Code

Identify the Presenting View Controller:

You first obtain the presenting view controller. This could either be the controller that presented C or, if C was presented by a navigation controller, the navigation controller itself.

This is done through:

[[See Video to Reveal this Text or Code Snippet]]

Identify the Navigation Controllers:

You then check if the presenting controller is a UINavigationController or if it's another controller that contains a navigation controller:

[[See Video to Reveal this Text or Code Snippet]]

Navigate Back to the Root:

If you have successfully obtained the navigation controller, you can dismiss the presented controller and pop the navigation stack back to A:

[[See Video to Reveal this Text or Code Snippet]]

Update: Dismissing Without Showing View-controller B

If you wish to navigate back to A without showing B (the view controller from which C was presented), you can use this alternative snippet:

[[See Video to Reveal this Text or Code Snippet]]

Key Changes in the Update

Set animated to false when popping back to the root view controller to avoid showing B. This allows for a direct transition from C to A.

Conclusion

Navigating back to the root view-controller from a modally presented view-controller can seem complicated at first, but with a clear understanding of the view-controller hierarchy and proper use of Swift code, this can be elegantly managed. Whether using animated transitions or opting for a seamless bypass of intermediate controllers, this approach enhances user flow and improves the overall experience in your iOS applications. Happy coding!