Скачать или смотреть SwiftUI: How to Change Text Color Based on User Input Without Duplicates

Learn how to manage and change the text color in SwiftUI by ensuring only a specific letter changes color upon user input. This guide tackles duplicate letter issues effectively.
---
This video is based on the question https://stackoverflow.com/q/75187890/ asked by the user 'Henry McCreight' ( https://stackoverflow.com/u/17527370/ ) and on the answer https://stackoverflow.com/a/75188516/ provided by the user 'rob mayoff' ( https://stackoverflow.com/u/77567/ ) 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: SwiftUI: Changing text color when specific letter is typed but avoiding duplicate color changes

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.
---
Managing Text Color Changes in SwiftUI Based on User Input

When developing apps in SwiftUI, handling user interactions with text display can be a bit tricky, particularly when aiming to change text colors dynamically. If you’re looking to create a seamless experience where letters change color upon user input, but want to avoid duplicated changes when dealing with repeated letters, you’re in the right place! In this post, we’ll dive into a solution that resolves this common challenge, specifically using a ForEach loop to display letters and conditionally altering their colors.

The Problem: Duplicated Color Changes

Imagine you have the letters of a word displayed on the screen, and want to change the color of specific letters when users type them. In our case, let's consider the word "Street." If the user types the letter 'e,' we want only one of the two 'e's to change color. However, a common issue arises where both 'e's turn green when one is typed. This happens because our original method checks if a letter is part of a collection without recognizing its instance.

The Solution: Custom Type for Display Letters

To tackle this issue effectively, we need to implement a structured solution that goes beyond the basic letter identification. Here’s how we can achieve it:

Step 1: Count Typed Letters

We begin by counting how many times each letter has been typed. This counting will help in determining how to change the colors of the letters displayed.

Step 2: Create a Custom Struct

Instead of using characters directly, we will create a struct that holds both a letter and its corresponding color. This will give us more control over how we display the letters.

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

Step 3: Generate Display Letters Method

Next, we extend our WordDataModel class to include a method that generates an array of DisplayLetter instances. This method will examine the letters in shuffleDisplay and the current counts of typed letters:

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

Step 4: Update the ShuffleView

Finally, we will modify our ShuffleView to utilize this new method. This ensures that we can effectively manage color changes on a per-letter basis without any duplicate modifications:

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

Conclusion

By following these steps, you can effectively manage color changes for letters based on user input without duplicating changes for letters that occur more than once. This solution uses a custom struct and an organized method to ensure each letter behaves independently, giving users a clear and responsive experience. Happy coding in SwiftUI!