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Struggling with `GeometryReader` resizing when the keyboard opens in SwiftUI? Learn how to use UIScreen dimensions instead to maintain consistent frame sizes across devices.
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This video is based on the question https://stackoverflow.com/q/63529220/ asked by the user 'Spdollaz' ( https://stackoverflow.com/u/10142976/ ) and on the answer https://stackoverflow.com/a/63530145/ provided by the user 'Mahdi BM' ( https://stackoverflow.com/u/11837341/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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How to Stop GeometryReader from Changing Value When Keyboard Opens in SwiftUI

SwiftUI has revolutionized the way we build interfaces for iOS. However, as developers delve deeper into its functionalities, they might encounter certain quirks, such as the behavior of GeometryReader when the keyboard is opened. In this post, we’ll explore this issue and offer a better solution to ensure your app’s layout remains consistent.

The Problem: Resizing with GeometryReader

When you use GeometryReader to layout views in SwiftUI, you might find that the size changes when the keyboard becomes visible. This behavior can disrupt the design of your application and lead to a frustrating user experience. For instance, consider the following code snippet:

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In this example, you can see that the rectangle, which is expected to have a fixed size relative to the screen dimensions, resizes when the TextField is tapped and the keyboard opens. This raises the question: how can we maintain a consistent frame size that is independent of the keyboard's appearance?

The Solution: Using UIScreen Dimensions

The good news is that you don’t actually need to use GeometryReader to determine the screen's size. Instead, you can access the screen dimensions directly with UIScreen.main.bounds. This method allows you to set the sizes of your views without worrying about the keyboard's effect.

Here’s How to Do It:

Retrieve Screen Size:
Use UIScreen.main.bounds to get the device screen's width and height. This method returns the dimensions that remain constant regardless of the keyboard's visibility.

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Set Fixed Frame Sizes:
Next, use the retrieved screen dimensions to set the size of the views. For instance, if you want your rectangle to have a width that is half the screen width, you can do the following:

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

Benefits of This Approach:

Consistent Layout: By relying on the screen size, you ensure that your layout does not change unexpectedly when the user interacts with text fields or other elements that trigger the keyboard.

Compatibility Across Devices: This method supports various screen sizes and orientations automatically, making your UI more robust and adaptable to different iPhone models.

Conclusion

In conclusion, while GeometryReader is a powerful tool in SwiftUI, it can lead to unintended behavior like layout changes due to the keyboard's presence. By switching to UIScreen.main.bounds for size calculations, you can maintain a steady and consistent user interface across your application. This approach will not only simplify your code but also enhance the user experience.

By following these guidelines, you ensure your SwiftUI application stays visually organized and user-friendly, even when users engage with text inputs and the keyboard comes into play. Happy coding!