Скачать или смотреть How to Properly Read and Send CGSize Values in SwiftUI

Discover an efficient way to read and send calculated `CGSize` values in SwiftUI using a custom extension method for better implementation of view sizes.
---
This video is based on the question https://stackoverflow.com/q/66793834/ asked by the user 'ios coder' ( https://stackoverflow.com/u/13899957/ ) and on the answer https://stackoverflow.com/a/66822461/ provided by the user 'ios coder' ( https://stackoverflow.com/u/13899957/ ) 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: Size of View 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.
---
Understanding the Problem: Reading View Sizes in SwiftUI

In SwiftUI, working with view sizes can often lead to unexpected behavior, especially when trying to read and manipulate the size of a view. In your scenario, you're finding that the initial value of CGSize is defaulting to (0.0, 0.0), which isn't ideal for your needs. Instead, you want to send the calculated size after it has been determined, rather than the unwanted initial value.

The Challenge

You need to capture the size of a SwiftUI view.

The current setup is sending an unhelpful initial value instead of the calculated size.

You’re considering using a completion handler to resolve this issue, but you’re unsure how to implement it effectively.

The Solution: Using a Custom Size Reader

The good news is that SwiftUI provides a way to read the size of views through the GeometryReader. However, this can sometimes be a bit verbose and less intuitive for common use cases. The solution is to create a reusable extension that simplifies this process.

Step-by-Step Implementation

1. Create a View Extension

You can leverage SwiftUI's extension mechanism to create a new method called sizeReader. This method will capture the size of any view using a GeometryReader and send it back as a parameter.

Here’s how to do it:

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

2. Utilizing the sizeReader Method in Your Views

Once you have your sizeReader method set up, it’s straightforward to implement it in your ContentView. Here’s an example of how you can use the extension to print the size of a Text view:

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

Benefits of Using sizeReader

Cleaner Code: The extension helps to declutter your code, making your SwiftUI views easier to read and maintain.

Versatile: You can apply the sizeReader method to any view, effectively capturing their sizes without extensive boilerplate code.

Real-time Updates: By leveraging the onPreferenceChange, your view will be updated in real time as the size changes.

Conclusion

By creating a simple yet effective sizeReader extension, you can efficiently manage view sizes in your SwiftUI applications. This approach not only resolves the challenge of initial unhelpful sizes but also enhances the code clarity and maintainability of your SwiftUI projects.

So go ahead and implement this solution in your own projects, and notice the significant difference it makes!