Скачать или смотреть How to Calculate Remaining Available Vertical Space in SwiftUI

A guide to using GeometryReader in SwiftUI to calculate the remaining vertical space at the bottom of your screen, perfect for displaying charts.
---
This video is based on the question https://stackoverflow.com/q/64637230/ asked by the user 'Dawy' ( https://stackoverflow.com/u/6723756/ ) and on the answer https://stackoverflow.com/a/64640058/ 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 to calculate remaining available vertical space

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 Calculate Remaining Available Vertical Space in SwiftUI

If you find yourself in a situation where you need to determine the vertical space left on the screen in a SwiftUI application, you're in the right place! This often comes up when you want to draw dynamic elements like charts or other UI components that rely on the remaining space. In this guide, we'll walk through an effective solution to calculate this remaining vertical space using SwiftUI's GeometryReader.

Why Is It Important?

In SwiftUI, understanding the layout and available space is crucial, especially for responsive designs. When working with stacked views (like VStacks), you might want to visualize data using charts at the bottom. Knowing the remaining vertical space allows you to scale your charts appropriately, ensuring they fit perfectly into the layout without cluttering or overlapping with other elements.

The Solution: Using GeometryReader

One of the best tools available in SwiftUI for measuring available space is the GeometryReader. This powerful view can help you dynamically calculate and respond to the available space within your application's user interface.

Step-by-Step Implementation

Here’s how you can implement it in your SwiftUI view:

Declare State Variables: First, define any state variables you might need. In this case, we will primarily focus on height.

Create Your View: In your main view, you will stack your existing components above the area where you want to render the chart.

Include GeometryReader: Place the GeometryReader at the bottom of your VStack to utilize the remaining space.

Example Code Snippet

Here’s a simplified version of how this looks in SwiftUI:

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

Breakdown of the Code

VStack: This is your vertical stack that contains the other views (View1 and View2) above the chart area.

GeometryReader: This view occupies the available area, allowing you to access the size metrics via the variable geometry.

Dynamic Sizing: Inside GeometryReader, you can determine the height dynamically, which you can then utilize to scale your chart or any other components accordingly.

Benefits of Using GeometryReader

Flexibility: It allows for real-time adjustment of layouts based on device orientation and screen size.

Simplicity: The implementation is straightforward and integrates seamlessly with existing SwiftUI components.

Conclusion

Calculating the remaining available vertical space in SwiftUI is essential for creating dynamic and responsive user interfaces. By employing GeometryReader, you can easily determine available space and make adjustments to fit your chart or any other UI elements perfectly.

By following the example and guidelines laid out in this post, you can enhance your SwiftUI applications with a better design that accommodates various visual components effectively. Happy coding!