Скачать или смотреть How to Set @ EnvironmentObject in an Existing Storyboard Based iOS Project

Learn to integrate `@ EnvironmentObject` in your existing Storyboard-based iOS projects and unlock the power of SwiftUI alongside UIKit!
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This video is based on the question https://stackoverflow.com/q/66901476/ asked by the user 'Vidhya Sri' ( https://stackoverflow.com/u/3640951/ ) and on the answer https://stackoverflow.com/a/66903338/ provided by the user 'Aswath' ( https://stackoverflow.com/u/3970488/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Integrating @ EnvironmentObject in an Existing Storyboard-Based iOS Project

If you've been working with a Storyboard and UIKit to create your iOS applications and now want to expand your project using SwiftUI, you're likely to face some challenges, especially when it comes to sharing data between your UIKit and SwiftUI components. One common issue developers encounter is setting up the @ EnvironmentObject in a mixed environment where both UIKit and SwiftUI coexist. This guide will guide you through the process of establishing an @ EnvironmentObject within your existing storyboard-based iOS project.

The Problem: Sharing Data in a Mixed Environment

In a pure SwiftUI application, you would normally define an @ StateObject in your application's main struct, allowing you to seamlessly pass data to various views using the .environmentObject modifier. However, when you're working with a project that primarily uses UIKit and a storyboard for layout, things can become tricky.

Example of Difficulties

Usually, you'd set up the environment object like this in a SwiftUI application:

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But in your existing storyboard-based project, where you have AppDelegate, SceneDelegate, and storyboard initialization, you can't directly use the same approach. So, how do you create an @ EnvironmentObject that can be accessed globally throughout both your UIKit view controllers and SwiftUI views?

The Solution: Setting Up @ EnvironmentObject

Step 1: Create an Observable Object

First, you need to create a class that conforms to ObservableObject. This class will hold the data you want to share with your SwiftUI views. For example:

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Step 2: Initialize in the ViewController

In your main view controller (for example ViewController), create an instance of your observable object and pass it to your other view controllers as needed.

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Step 3: Set Up SwiftUI View with @ EnvironmentObject

Next, in your SwiftUI view, you can now consume this observable object. You will need to set up your SwiftUI view to accept the @ EnvironmentObject:

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Step 4: Create a Hosting Controller

Lastly, in your UIViewController that needs to present the SwiftUI view, set up a UIHostingController and pass the orderObservable as an environment object:

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

This will allow you to present your SwiftUI views correctly while sharing data from your UIKit components.

Conclusion

By following these steps, you can successfully set up an @ EnvironmentObject in an existing storyboard-based iOS project. This setup allows you to leverage the powerful data-binding capabilities of SwiftUI while maintaining your existing UIKit structure. As you expand your features with SwiftUI, this method will ensure that your data flows seamlessly between your different UI frameworks.

Now, you can enjoy the benefits of both UIKit and SwiftUI within the same application!