Скачать или смотреть How to Implement onCommit, isEditing, and Custom Bindings in a UITextView for SwiftUI

Discover how to enhance your `UITextView` with `onCommit`, `isEditing`, and custom bindings using SwiftUI's `UIViewRepresentable`.
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This video is based on the question https://stackoverflow.com/q/63660768/ asked by the user 'nickcoding' ( https://stackoverflow.com/u/12771165/ ) and on the answer https://stackoverflow.com/a/63695311/ provided by the user 'Mojtaba Hosseini' ( https://stackoverflow.com/u/5623035/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Enhancing UITextView Functionality in SwiftUI

When working with text input in SwiftUI, developers often desire functionalities similar to those found in native UITextField elements—specifically the ability to detect text commits and editing states. In this guide, we'll discuss how to implement onCommit, track editing states with isEditing, and set up custom bindings in a UITextView using SwiftUI's UIViewRepresentable.

The Problem Statement

Developers seek a way to replicate the capabilities of TextField within a UITextView in SwiftUI, particularly needing to handle events such as when the return key is pressed or when the text view becomes active. Let's dive into how we can achieve that.

Implementing the onCommit Functionality

Step 1: Adding the onCommit Parameter

To allow handling the commit event when the return key is pressed, you can introduce an onCommit callback in your TextView structure as follows:

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

Step 2: Using the TextView

You can now use TextView like this to track commits:

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

Tracking isEditing State

Step 1: Detecting Edits with .onChange

To track when the text is being edited, we can directly use the onChange modifier in SwiftUI if you’re using SwiftUI 2.0. Here's how to implement it:

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

Updating the @ Binding Value

Step 1: Ensure the Binding Reflects Changes

To make sure that the binding updates correctly, implement the following in your Coordinator:

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

This ensures that the actual value in your behavior reacts as intended.

Bonus: Streamlining Configuration via SwiftUI

You can also pass configuration options directly from SwiftUI, making your TextView customizable:

Full Refactored Code

Below is a comprehensive setup for your TextView:

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

Summary

By implementing the techniques outlined above, you can elegantly handle text input in UITextView while leveraging the power of SwiftUI's binding and state management.

Now you can enjoy a fully functional text view that behaves similarly to built-in text fields, complete with commit handling and editing state management!