Скачать или смотреть How to Capture Cmd + Enter in a Swift NSTextField using SwiftUI

Discover how to effectively listen for the Cmd + Enter key combination in your Swift NSTextField implementation. Learn step-by-step how to achieve it using simple code solutions.
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This video is based on the question https://stackoverflow.com/q/61806458/ asked by the user 'Oscar Franco' ( https://stackoverflow.com/u/3107926/ ) and on the answer https://stackoverflow.com/a/64654037/ provided by the user 'P. A. Monsaille' ( https://stackoverflow.com/u/7625403/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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How to Capture Cmd + Enter in a Swift NSTextField using SwiftUI

As developers, we often face challenges when trying to create seamless user interactions in our applications. One common scenario in a macOS application is the need to execute a specific action when the user presses a key combination, such as Cmd + Enter. If you're working with a NSTextView within a SwiftUI context, you may find yourself struggling to catch this key combination effectively.

In this guide, we will break down the step-by-step solution to implement a listener for the Cmd + Enter combo in a Swift NSTextField. Let’s delve into the problem and explore the solution.

Understanding the Problem

When users are editing text in an NSTextView, you might want to execute a command after they finish their input. For instance, when they press Cmd + Enter, you may want to save the text or submit the information. The caveat is that detecting this key press requires a proper understanding of event handling in macOS applications built with SwiftUI.

Initial Implementation

You might start with a class that conforms to NSTextViewDelegate, as shown in the following code snippet:

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

In this initial code, we are setting up to respond to command inputs but have not fully implemented the condition to detect Cmd + Enter.

The Solution

With guidance from community input, we can refine our implementation to correctly capture the Cmd + Enter key press. Here’s how to do it:

Step-by-Step Implementation

Modify the doCommandBy Method: You need to check the current event to determine if the Cmd key is pressed along with the Enter key.

Check Modifier Flags and Key Code: Specifically, you will check the event's modifier flags and key code.

Here’s the refined code:

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

Explanation of the Code

NSEvent.currentEvent: This retrieves the current keyboard event, allowing you to check which keys are pressed.

modifierFlags: Using intersection(.deviceIndependentFlagsMask) helps to focus only on modifier keys like Cmd, ignoring other keys that may also be pressed.

keyCode == 36: The key code 36 corresponds to the Enter key. By checking these conditions, you ensure that your method only responds when both Cmd and Enter are pressed at the same time.

Catching the Event: When the desired keys are pressed, a message is printed, and you can replace that with any action you wish to perform.

Conclusion

With these modifications to your NSTextViewDelegate, you now have a reliable way to execute actions upon pressing Cmd + Enter. It's always rewarding to solve a challenging problem and enhance user experience in your applications.

Feel free to share your experiences or ask questions in the comments below. Happy coding!