Скачать или смотреть Navigating from SwiftUI to UIViewController Using an Existing Navigation Controller

Discover the step-by-step approach to navigate from SwiftUI to UIViewController using an existing navigation controller. Understand how to inject and use the navigation controller in your SwiftUI views effectively.
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This video is based on the question https://stackoverflow.com/q/65160701/ asked by the user 'j.doe' ( https://stackoverflow.com/u/5890175/ ) and on the answer https://stackoverflow.com/a/65160922/ provided by the user 'Asperi' ( https://stackoverflow.com/u/12299030/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Navigating from SwiftUI to UIViewController Using an Existing Navigation Controller

Navigating between different view controllers is a common requirement in iOS development, particularly when working with both SwiftUI and UIKit. Whether you're building a new application with SwiftUI or integrating it into an existing UIKit project, knowing how to use an existing UINavigationController can be crucial. This post will guide you through how to effectively navigate from a SwiftUI view back to a UIViewController using the existing navigation stack.

The Setup

Suppose you have a UINavigationController initialized in your App's scene delegate, which handles navigation to a UIViewController. This UIViewController then presents a UIHostingController that wraps a SwiftUI view. Here’s what the structure looks like:

App Launch: The main entry point where the navigation controller is set up.

Initial View Controller: This UIViewController manages a table view where selections can trigger navigation changes.

SwiftUI View: The UIHostingController that wraps the SwiftUI view to display content.

Example Scene Setup

Here’s a simplified version of how your UISceneDelegate might look:

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

Navigating to SwiftUI

In your PreviewViewVideoController, you handle user interaction via a table view. Here’s how you typically push a SwiftUI view wrapped in a UIHostingController when the user selects a row:

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

The Challenge

But what if you want to navigate from the FilmOverviewView back to another UIViewController? The challenge is to access the existing UINavigationController within your SwiftUI view.

Solution: Injecting the UINavigationController

To overcome this challenge, you can inject the UINavigationController into your SwiftUI view environment. Here's how you can accomplish this in steps:

1. Create a Custom EnvironmentKey

Start by defining a custom EnvironmentKey that allows the SwiftUI view to access the navigation controller:

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

2. Pass the Navigation Controller

In your tableView:didSelectRowAt method of your PreviewViewVideoController, you'll inject the navigation controller into the FilmOverviewView:

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

3. Usage in FilmOverviewView

In the FilmOverviewView, you can now access the injected navigationController and use it to push another view controller:

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

4. Custom UIHostingController

If you need specific behavior in the hosting controller, you can subclass UIHostingController like this:

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

Conclusion

Using this approach, you can effectively navigate between a SwiftUI view and UIKit's UIViewControllers while utilizing an existing UINavigationController. This method not only maintains the navigation stack but also allows the seamless integration of SwiftUI within UIKit applications.

By following the steps outlined above, you'll be well-equipped to implement flexible navigation within your iOS apps. Happy coding!