Скачать или смотреть Solving the "Cannot find 'ObservableObject' in scope" Error in SwiftUI

A guide to resolve the 'Cannot find ObservableObject in scope' error while using parameters in SwiftUI. Learn how to properly implement @Binding and create reusable components.
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This video is based on the question https://stackoverflow.com/q/74280800/ asked by the user 'BlowMyMind' ( https://stackoverflow.com/u/10349656/ ) and on the answer https://stackoverflow.com/a/74308163/ provided by the user 'malhal' ( https://stackoverflow.com/u/259521/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Resolving the “Cannot find 'ObservableObject' in scope” Error in SwiftUI

When developing applications in SwiftUI, you may encounter a common error: “Cannot find 'ObservableObject' in scope.” This issue arises particularly when you attempt to bind a parameter in a function to a Binding<String> type, which can be frustrating. Let’s delve into this problem and provide a clear solution to help you understand what's going wrong and how to fix it.

Understanding the Error

In the provided code, you have a SwiftUI view called BugView, which uses a TextManager class as a parameter in a separate method. The error occurs when you're trying to bind the Text property of the TextManager to a TextField. In general, the issue is rooted in the fact that SwiftUI expects certain structures to follow the principles of state management. Let's break down the necessary corrections.

Solutions to the Problem

1. Use Struct Instead of Class

First and foremost, it's important to understand that TextManager should be a struct instead of a class. In SwiftUI, using structs allows the framework to identify changes directly, as structs are value types. Here’s how to redefine TextManager:

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

2. Creating a Custom Subview

Instead of using a view builder function like fetchTextView, it's better to create a custom subview. This custom view will manage its state with a @Binding property and allow you to pass data efficiently. Here’s how to implement FetchTextView:

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

3. Using The Custom Subview

Now that you have a suitable subview, you can utilize it in your BugView as follows:

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

Key Takeaways

Ensure that your data model (TextManager) is a struct rather than a class.

Use custom subviews with @Binding properties instead of inline functions for better state management and efficiency.

Utilize @State to manage the data model in your primary view and pass this binding to the subview for interactive UI updates.

By following these steps, you'll not only resolve the "Cannot find 'ObservableObject' in scope" error but also enhance the modularity and maintainability of your SwiftUI code. Happy coding!