Скачать или смотреть How to Make Your View-Extension Sensitive to State Changes in SwiftUI

Learn how to update your View-Extension in SwiftUI to respond to state changes effectively and improve your app's interactivity.
---
This video is based on the question https://stackoverflow.com/q/64754409/ asked by the user 'ios coder' ( https://stackoverflow.com/u/13899957/ ) and on the answer https://stackoverflow.com/a/64754506/ 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.

Visit these links for original content and any more details, such as alternate solutions, latest updates/developments on topic, comments, revision history etc. For example, the original title of the Question was: How I can make my View-Extension update View with State input in SwiftUI?

Also, Content (except music) licensed under CC BY-SA https://meta.stackexchange.com/help/l...
The original Question post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license, and the original Answer post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license.

If anything seems off to you, please feel free to write me at vlogize [AT] gmail [DOT] com.
---
How to Make Your View-Extension Sensitive to State Changes in SwiftUI

In the world of SwiftUI, creating interactive and responsive user interfaces is one of the primary goals of any developer. However, you might encounter situations where your View-Extension doesn't update as expected when the underlying data changes. This post tackles a common problem: how to make your View-Extension sensitive to state changes, ensuring that your user interface is always in sync with the data it represents.

Understanding the Problem

Consider the following code snippet:

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

The Issue

In this code, we see that customText is defined with a @ State variable, stringOfText. This state is meant to hold the string information fed into the view. However, the way it is structured means that the state is not recreated on updates. As a result, when changeString in the ContentView is modified, customText does not reflect this change. Essentially, the View doesn’t get updated upon state changes, defeating your goal of making it reactive.

Solution Breakdown

Fortunately, it is fairly straightforward to solve this problem. Here’s how you can revise your customText view structure to ensure it updates with state changes:

1. Modify the customText Structure

Instead of using @ State for stringOfText, you need to pass it as a regular parameter:

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

2. Adapting Your ContentView

With the change to customText, your ContentView remains largely unchanged, but the instantiation of customText becomes key in ensuring updates:

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

Key Points to Remember

Avoiding @ State in Extensions: One crucial takeaway is to refrain from using @ State in your View-Extensions when you want them to respond dynamically to external state changes. Instead, treat them as simple data-holding structures.

Dependency Injection: Pass necessary data directly to your view. This improves clarity and makes it easier to understand where data is coming from.

Conclusion

By making these adjustments to your View-Extension, you can create a more responsive experience in your SwiftUI application. As a result, your views will accurately reflect the current state of your application, providing users with a seamless and interactive experience. Remember to keep your views clean, and pass data in an understandable way to achieve the desired interaction.

With these tips, you should now be well-equipped to make your SwiftUI applications more dynamic and engaging! Happy coding!