[ECO-5468] Add Swift documentation for LiveObjects by lawrence-forooghian · Pull Request #2769 · ably/docs

lawrence-forooghian · 2025-08-14T14:24:52Z

Description

Based on the Swift plugin at commit 714988d and ably-cocoa's integration/liveobjects branch at commit 5096ca3.

Some notes:

I haven't added Swift code to the batch API page because it's not yet implemented in Swift and the stub public API that we do have is incorrect and will be removed pre-v0.1 launch.
I haven't bothered adding Swift to the inband-objects page given that on the same page we're telling people to use the Swift SDK.

The quickstart content is a copy and paste of the JS quickstart.

Resolves https://ably.atlassian.net/browse/ECO-5468.

Checklist

Commits have been rebased.
Linting has been run against the changed file(s).
The PR adheres to the writing style guide and contribution guide.

coderabbitai · 2025-08-14T14:25:00Z

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lawrence-forooghian · 2025-08-21T12:27:25Z

Need to resolve conflicts with main

Done

m-hulbert · 2025-08-21T16:09:27Z

+<If lang="swift">
+To remove a counter update listener from _inside_ the listener function, you can call `unsubscribe()` on the subscription response that is passed as the second argument to the listener function:
+
+```swift


This needs to be wrapped in <Code> tags.

Thanks, done

m-hulbert · 2025-08-21T16:10:30Z

+<If lang="swift">
+To remove a map update listener from _inside_ the listener function, you can call `unsubscribe()` on the subscription response that is passed as the second argument to the listener function:
+
+```swift


This needs to be wrapped in <Code> tags.

Thanks, done

m-hulbert · 2025-08-21T16:13:44Z

 },
 liveObjects: {
 javascript: '2.9',
+ swift: '0.1',


It's a little odd that we're tying JS/Java to their Pub/Sub version but having Swift at 0.1 just because of how they're imported (just a comment).

The difference is that in JS and Java, the LiveObjects plugin is part of the core SDK and hence must have the same version. In Swift, we are forced to have a separate repository for the plugin, which has the happy side effect of allowing us to choose a semantic version number that reflects the fact that the LiveObjects API is experimental (JS and Java instead have to rely on code comments that state this).

Yeah, I totally understand the reasoning. Just from an external perspective it makes it look like JS and Java are far more mature than the Swift implementation.

For sure — do you have any thoughts on what we could do to mitigate this?

I think it's something we need to look at holistically that we should include on some guidance for releasing plugins. Not worth blocking this from releasing right now.

m-hulbert · 2025-08-21T16:16:29Z

 ## Update LiveCounter <a id="update"/>

-Update the counter value by calling `LiveCounter.increment()` or `LiveCounter.decrement()`. These operations are synchronized across all clients and trigger data subscription callbacks for the counter, including on the client making the request.
+Update the counter value by calling <If lang="javascript">`LiveCounter.increment()` or `LiveCounter.decrement()`</If><If lang="swift">`LiveCounter.increment(amount:)` or `LiveCounter.decrement(amount:)`</If>. These operations are synchronized across all clients and trigger data subscription callbacks for the counter, including on the client making the request.


I'd personally keep all these occurrences as LiveCounter.increment() since the usage is immediately below to save ending up with 10+ theoretical if statements, unless you think it's that important to keep in.

Could you please explain what you mean by "10+ theoretical if statements"? In Swift, the name of a method always includes its parameter labels and this is usually respected in documentation; I could omit them to keep things maintainable here but it might look a bit sloppy to people who are used to working in Swift.

With 10+ I was referring to if we were to implement LiveObjects in all SDKs and they all have slightly different signatures.
I have no issues at all with keeping it, if it's the common pattern for Swift. We should extend this to other products though in that case (e.g. Chat definitely doesn't follow this format for Swift which is what made me question the need here).

We should extend this to other products though in that case (e.g. Chat definitely doesn't follow this format for Swift which is what made me question the need here).
Agreed — created ably/ably-cocoa#2093 and ably/ably-chat-swift#351

sacOO7

one more file conflict

I'll be adding Swift documentation for LiveObjects shortly, thus giving us our second language. Mark indicated that we wish to have a per-language quickstart guide, consistent with the other getting started guides e.g. chat.

lawrence-forooghian · 2025-08-22T14:24:05Z

one more file conflict

Fixed

Based on Swift plugin at commit 714988d and ably-cocoa's integration/liveobjects branch at commit 5096ca3. Some notes: - I haven't added Swift code to the batch API page because it's not yet implemented in Swift and the stub public API that we do have is incorrect and will be removed pre-v0.1 launch. - I haven't bothered adding Swift to the inband-objects page given that on the same page we're telling people to use the Swift SDK. The quickstart content is a copy and paste of the JS quickstart.

lawrence-forooghian · 2025-08-22T14:58:36Z

@sacOO7 I've pushed again to incorporate #2775

m-hulbert · 2025-08-28T11:51:50Z

@@ -0,0 +1,201 @@
+---
+title: "Quickstart: LiveObjects in Swift"


Suggested change
title: "Quickstart: LiveObjects in Swift"
title: "Getting started: LiveObjects in Swift"

updated in the java doc PR to avoid conflicts #2771 (comment)

lawrence-forooghian changed the base branch from main to 2025-08-14-new-user-build-fixesAugust 14, 2025 14:25

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This was referenced Aug 22, 2025
Check that ably.com/docs include parameter labels when talking about methods ably/ably-cocoa#2093
Open
Check that ably.com/docs include parameter labels when talking about methods ably/ably-chat-swift#351
Open

lawrence-forooghian added 2 commits August 22, 2025 11:23

Introduce per-language quickstarts for LiveObjects
5af23cf
I'll be adding Swift documentation for LiveObjects shortly, thus giving us our second language. Mark indicated that we wish to have a per-language quickstart guide, consistent with the other getting started guides e.g. chat.

Make some LiveObjects concepts code language-agnostic
3c7b77d

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umair-ably approved these changes Aug 26, 2025
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Merge branch 'main' into liveobjects-swift-documentation
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Merge branch 'main' into liveobjects-swift-documentation
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		@@ -0,0 +1,201 @@
		---
		title: "Quickstart: LiveObjects in Swift"

	title: "Quickstart: LiveObjects in Swift"
	title: "Getting started: LiveObjects in Swift"

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