Скачать или смотреть How to Dynamically Resize NSWindow to Fit SwiftUI Content

Learn how to automatically resize an `NSWindow` to fit the content of a `SwiftUI` view that contains variable-length strings, ensuring a responsive and user-friendly interface.
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This video is based on the question https://stackoverflow.com/q/64836076/ asked by the user 'Joseph Duffy' ( https://stackoverflow.com/u/657676/ ) and on the answer https://stackoverflow.com/a/64836292/ 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.

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Dynamically Resize NSWindow to Fit SwiftUI Content

When developing macOS applications using SwiftUI, you may encounter a situation where your content size is dynamic due to variable-length strings—especially in cases involving localization. For instance, if you have a label that grows as text is added, you want to ensure that the containing NSWindow adjusts its size accordingly. In this guide, we’ll walk through a practical approach to achieve this seamless resizing of NSWindow for a SwiftUI view.

The Problem: Static Window Sizes

In a typical setup, an NSWindow is created with a predetermined size. However, when the content of a SwiftUI view changes—in this case, when new text is added via a button click—the window might not automatically resize, which can result in truncation of text. Here’s an overview of the original scenario:

You create an NSWindow with fixed dimensions.

A SwiftUI view contains a text label that can expand infinitely as users interact with it.

Eventually, it becomes apparent that the window size is insufficient, leading to an unpleasing user experience.

The Solution: Dynamic Resizing with SwiftUI

To enable the dynamic resizing of NSWindow based on the content size in SwiftUI, follow these simple steps. Below, we'll break down how to adjust your ContentView to ensure your window expands as needed.

Step-by-Step Implementation

Set Up Your Environment:
Ensure you have a macOS app with an AppDelegate managing your main NSWindow. The standard setup involves creating a basic AppDelegate as follows:

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

Create an Expandable ContentView:
Define your ContentView to include a text element and a button. The button appends text to the label to simulate a change in content size. To ensure the window resizes dynamically, apply the following changes:

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

Key Modifications Explained

.frame(minWidth:minHeight:): This modifier sets a minimum size for your window, which prevents it from being too small, while still allowing it to grow.

.fixedSize(): This modifier tells the view to occupy the necessary space to display its content without truncation and allows dynamic changes in size to reflect in the parent window.

Conclusion

By implementing these changes, you ensure that your NSWindow automatically resizes based on the content size of your SwiftUI view, creating a smoother and more user-friendly interface. This dynamic resizing capability not only enhances usability but also makes your app more adaptable to various lengths of text, including those due to localization adjustments.

Make sure to test your application after these modifications to verify that the window resizes as intended when the text content is updated. Happy coding!