Скачать или смотреть How to Push ViewController from Inside UIHostingController's SwiftUI View

Learn how to navigate from a SwiftUI view embedded in a UIHostingController to another ViewController using pushViewController in UIKit.
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Navigating SwiftUI to UIKit: Pushing ViewControllers from UIHostingController

In the world of iOS development, SwiftUI provides a modern way to build user interfaces. However, if you're working with an existing UIKit application, you might face challenges integrating SwiftUI views seamlessly into your UIKit architecture. A common question that arises is: How can you push a new ViewController from a SwiftUI view hosted inside a UIHostingController? This article will explore that solution in depth.

The Setup: UIKit Meets SwiftUI

Before diving into the solution, let's briefly understand the scenario. We have a UIHostingController that allows us to bridge SwiftUI views into our UIKit app. The aim is to enable navigation from a button in a SwiftUI view to another ViewController.

Here’s a simplified structure of our UIKit and SwiftUI integration:

MainViewController: This is our main UIKit view controller.

SwiftUIView: A SwiftUI view that contains a button for navigation.

Example Code Structure

The following snippets provide a basic outline of our setup:

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SwiftUI View Example

Here's how our SwiftUIView is currently structured:

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Enabling Navigation: The Solution

To achieve the desired functionality of pushing a ViewController from the SwiftUIView, follow these steps:

1. Make Your MainViewController Observable

Modify MainViewController to conform to ObservableObject. This allows the SwiftUI view to recognize it as a source of truth.

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2. Set Environment Object on SwiftUI View

Pass the instance of MainViewController to the SwiftUI view using the environmentObject modifier. This establishes a connection between the UIKit and SwiftUI components.

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3. Accessing the Parent Environment Object

Inside your SwiftUIView, you can now access MainViewController using the @ EnvironmentObject property wrapper.

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Final Code Example

Here’s how the complete implementation looks:

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Conclusion

By following these steps, you can successfully navigate from a SwiftUI view to a UIKit ViewController. This approach allows you to maintain a clean separation between your UI and business logic while leveraging the strengths of both SwiftUI and UIKit. Whether you're transitioning an existing app or starting fresh, understanding how to bridge these technologies can significantly enhance your development process.

Remember, the key takeaway here is the use of @ EnvironmentObject to access your UIKit components from within SwiftUI views, enabling a smooth and effective navigation flow.