What does Observable protocol (not macro) conformance get you?

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Created Aug ’25

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Hi, In the Apple Scrumdinger sample, the SpeechRecognizer class conforms to the Observable protocol:

public actor SpeechRecognizer: Observable {
    public enum RecognizerError: Error {
        case nilRecognizer
.
.
.

Screenshot 2025-08-14 at 2.59.05 PM.png The developer help text suggests that the protocol conformance does not add observation functionality. This class does not use the @Observable macro. So, how does this work under the hood?

Answered by DTS Engineer in 854111022

The Observable protocol is effectively an implementation detail of the @Observable macro. If you secondary click on @Observable and choose Expand Macro, you’ll see that part of the expansion is this:

extension MyClass: Observation.Observable {
}

As to what that sample is doing, I suspect that’s just something left over from a historical refactoring. I’d appreciate you filing a bug against the sample.

Please post your bug number, just for the record.

Share and Enjoy
—
Quinn “The Eskimo!” @ Developer Technical Support @ Apple
let myEmail = "eskimo" + "1" + "@" + "apple.com"

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Answer 1

DTS Engineer OP

Apple

Aug ’25

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The Observable protocol is effectively an implementation detail of the @Observable macro. If you secondary click on @Observable and choose Expand Macro, you’ll see that part of the expansion is this:

extension MyClass: Observation.Observable {
}

As to what that sample is doing, I suspect that’s just something left over from a historical refactoring. I’d appreciate you filing a bug against the sample.

Please post your bug number, just for the record.

Share and Enjoy
—
Quinn “The Eskimo!” @ Developer Technical Support @ Apple
let myEmail = "eskimo" + "1" + "@" + "apple.com"

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