How to Add UIView and UILabel Programmatically on Mac OS Using Swift

Описание: Learn how to successfully create and display a `UIView` with a `UILabel` on macOS using Swift and UIKit, ensuring compatibility with different backgrounds and modes.
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This video is based on the question https://stackoverflow.com/q/65329392/ asked by the user 'Badger' ( https://stackoverflow.com/u/11934606/ ) and on the answer https://stackoverflow.com/a/65333364/ provided by the user 'Donovan Voss' ( https://stackoverflow.com/u/136841/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Mastering UIView and UILabel on Mac OS with Swift

When developing apps with Swift for multiple platforms, including macOS and iPadOS using UIKit, you might encounter some quirks that can lead to unexpected behavior. One common issue arises when adding a UIView and a UILabel programmatically—especially when working on macOS. In this guide, we'll address a scenario where a UILabel is not displaying text on macOS, providing a clear solution to troubleshoot and resolve the problem swiftly.

Understanding the Problem

Consider this situation: you have set up a UIView and are attempting to add a UILabel to it. On the iPad simulator, everything looks perfect—the label appears as intended in the center of your white background. However, when you switch to the macOS simulator, the expected text on your label is missing despite the background appearing white.

What Could Go Wrong?

This particular issue can stem from a few potential oversights, especially concerning how UI elements are rendered and styled on different platforms. Since macOS has different default settings, a missing label can often come down to the label's text color blending into the background.

Solution: Step-by-Step Guide

Here’s a comprehensive guide to troubleshooting and fixing the issue with your UILabel not displaying properly on macOS.

1. Check the UILabel Text Color

The default text color for a UILabel is typically white, which is why it might not be visible on a white background. Here’s how to fix this:

Set an explicit textColor for your label. You can choose any color that contrasts well with your background.

Alternatively, use .label which adapts automatically to the current system theme (light or dark mode).

2. Update Your Core Code

Here’s how you can modify your existing code to ensure the text is visible:

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3. Consider Adaptive Backgrounds

If you're aiming for a design that supports both light and dark modes, consider setting your view's background color to .systemBackground. This ensures that the background adapts based on user preferences, promoting a better user experience across different environments.

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Debugging Tools

Whenever you encounter UI issues, don’t forget to use the View Debugger in Xcode. This tool helps visualize your views and can provide insights into what might be going wrong. It’s an excellent resource for troubleshooting layout issues and verifying the configuration of your elements.

Conclusion

By following the steps outlined above, you can successfully display a UILabel within a UIView on macOS while maintaining a visually appealing interface. Remember to adjust the text color and background color for accessibility and aesthetic purposes. Happy coding, and enjoy creating beautiful apps across platforms!