Swift / Apple Development Chat

[casperes1996]

^ yeah, maybe it’s just a ‘genius’ idea this team came up with and that they’ve been allowed to release and see how it flies…or could be part of some long term strategy in which Apple’s development teams expect to increasingly need something like this. As you say, time will tell.

I think we’ll really know when wwdc happens. If they talk about it more than a quick mention

 

[dada_dave]

What was most interesting to me was honestly how quiet Apple has been about it. Nothing in the Developer app, nothing on developer.apple.com that I noticed at least. I found out through The Primeagen on YouTube and subsequently read on their GitHub and webpage for it. Also the fact it's written in Java/Kotlin is a bit curious to me. And on their website (last I checked at least) they noted having an x86 macOS build and x86+AArch64 Linux builds. That said, they did have an AArch64 macOS build their documentation just didn't mention it.
Personally I'm not sure exactly how useful this will be; If it will actually simplify configuration and get your out of a pickle or if it'll just be another dependency without really adding enough value to matter. Time will tell - Certainly configuration validation can be useful at least

I have to admit that I am not an expert in this topic, nor increasingly in my own field sadly, but I can see utility for my field where we need to partially specify models or a family of models, often with bounded parameters. That looks much easier and nicer here than YAML/JSON.

 

[casperes1996]

I have to admit that I am not an expert in this topic, nor increasingly in my own field sadly, but I can see utility for my field where we need to partially specify models or a family of models, often with bounded parameters. That looks much easier and nicer here than YAML/JSON.

Sure. I’ve also not looked deeply enough into it yet to fully understand pkl. What I can say though is that we have a roughly two thousand line long config file in json at work. A requirement was self service by non technical customers so we have a web page that can edit the configuration with easy to use buttons and input fields. I’m curious to see if pkl is capable of improving anything in that flow but kinda doubt it.

 

[Nycturne]

Apparently Apple has created a new open source data format language with conversions to JSON/YAML, seems to get positive reviews:

Pkl :: Pkl Docs

pkl-lang.org

Introducing Pkl, a programming language for configuration :: Pkl Docs

pkl-lang.org

Unsurprisingly integrates with Swift. Thought it might be of interest!

Yeah, I saw this a little bit ago. Some interesting ideas that I could leverage in a couple projects to make validation of config files easier, but I haven’t yet had a chance to play with it. But one project gets used by people that tend to skip the documentation and open github issues against the project when they don’t understand what the pre-built example is doing. So if I can reduce the cost to catch these issues early and issue more clear errors to these users, that means fewer github issues I need to resolve. Will need to see if this actually delivers on that.

Sure. I’ve also not looked deeply enough into it yet to fully understand pkl. What I can say though is that we have a roughly two thousand line long config file in json at work. A requirement was self service by non technical customers so we have a web page that can edit the configuration with easy to use buttons and input fields. I’m curious to see if pkl is capable of improving anything in that flow but kinda doubt it.

I don’t think this really replaces anything in your scenario. This is more for scenarios where the expectation is that the user can use configuration files, but you want to be able to constrain the bounds more easily and ensure the configuration schema is followed. If you are already building UIs that include validation, this won’t really add anything. But those UIs with full validation eat engineering resources if the users are supposed to be relatively tech savvy, and using your stuff to compose services with (i.e. docker-based micro services).

^ yeah, maybe it’s just a ‘genius’ idea this team came up with and that they’ve been allowed to release and see how it flies…or could be part of some long term strategy in which Apple’s development teams expect to increasingly need something like this. As you say, time will tell.

This likely was created to make it easier to configure their own internal services/etc, and reduce errors that get found later. With these large scale projects, it’s not easy to be able to hold it all in your head, and with so many people working on them in the first place, you are at the mercy of whatever documentation may or may not exist.

I’ve always been a fan of the philosophy of pushing errors as early as possible. An offshoot of the ‘fail fast’ thinking. Compiler/validation errors vs runtime errors, in this case. Pkl to me seems to be aimed at making it easier to produce validation errors for configuration files, which makes it safer for an engineer to make changes in unfamiliar parts of a larger service such as iCloud or the like.

 

[Andropov]

I’ve always been a fan of the philosophy of pushing errors as early as possible. An offshoot of the ‘fail fast’ thinking. Compiler/validation errors vs runtime errors, in this case. Pkl to me seems to be aimed at making it easier to produce validation errors for configuration files, which makes it safer for an engineer to make changes in unfamiliar parts of a larger service such as iCloud or the like.

This is the way. Amazing how much cleaner (and reliable!) the code can end up being by failing as early as possible.

 

[Nycturne]

This is the way. Amazing how much cleaner (and reliable!) the code can end up being by failing as early as possible.

It was one of the reasons Microsoft went a little XML crazy in the 00s. The promise was the ability to fully validate data from the schema using off-the-shelf tools during build time, and libraries at run time that would point out exactly where things went south.

 

[Nycturne]

Well, with the new stuff available, I'm pretty happy with what Swift added this year. There are still some UI constructs in SwiftUI that are a pain, but it's becoming less every year.

That said, I can't even play around with the new stuff much because my app uses Safari authentication. And Safari in the iOS 18 simulator is dog slow. As in, I was able to write this post while I waited for the Apple login screen to show up for Plex.

 

[casperes1996]

Interesting; So Rosetta 2 now supports AVX and AVX2. This seems to primarily be talked about in the context of GamePortingToolkit 2, but it is a general improvement to Rosetta. For one it's interesting Rosetta is not just sticking around but getting big updates like this. But also interesting is that sysctl under Rosetta still reports AVX and AVX2 as not supported, but if you try and run AVX code it works just fine. Not sure if that's a bug or intentional

I liked the Swift focus on a wider ecosystem for Swift at Platform State of The Union. Focus on Windows, Linux, web servers, embedded Swift, etc.
And refactoring things like gesture recognisers such out of UIKit so SwiftUI and UIKit can share it at a lower more foundational layer. Though as someone who likes to still use UIKit a fair bit I do worry it's a step towards completely eliminating it one day, though probably not near future at all

 

[Yoused]

I just starting playing around with XCode and Swift, and there is one thing that really bothers me. I type something and instantly it tells me what is wrong with my code. I mean, I appreciate that the editor is able to look at the code and tell me where there are syntax errors before I try to build, but damn that instant complaining messes with my ability to concentrate. Is there a way to turn that off? Or make it wait for 90 seconds of inactivity before it tells me I need to add a thing? Or do you guys just use a different editor?

 

[casperes1996]

I just starting playing around with XCode and Swift, and there is one thing that really bothers me. I type something and instantly it tells me what is wrong with my code. I mean, I appreciate that the editor is able to look at the code and tell me where there are syntax errors before I try to build, but damn that instant complaining messes with my ability to concentrate. Is there a way to turn that off? Or make it wait for 90 seconds of inactivity before it tells me I need to add a thing? Or do you guys just use a different editor?

So it does wait for inactivity a little. While you’re still typing at speed it won’t do it but the timer before it triggers after a keystroke is pretty brief. I believe it’s possible to turn off so it’s build only but not to delay the timer (perhaps with defaults write/plist editing)

While I would love to increase the delay a tiny tiny but I’ve honestly just gotten used to it and like it. It also often generates fixes in the errors so I’ve got cmd+shift+1 mapped to accepting all proposed fixes. So I write something where I know it’s going to complain about optional a lot in a moment, wait for the error generation then the shortcut and all are unwrapped which then allows me to find and replace variablename! With variablename? Without touching places where it’s guard let or otherwise not optional in a context.

Though during my regular working day I do interact with five different editors. Mainly Xcode but also Android Studio, vscode, Zed and nano. So I guess the answer is also that I use other editors

When by a Mac again I can look at confirming where to turn it off. Just writing from phone. But I’m pretty sure it’s in the app settings under editor

 

[casperes1996]

I just starting playing around with XCode and Swift, and there is one thing that really bothers me. I type something and instantly it tells me what is wrong with my code. I mean, I appreciate that the editor is able to look at the code and tell me where there are syntax errors before I try to build, but damn that instant complaining messes with my ability to concentrate. Is there a way to turn that off? Or make it wait for 90 seconds of inactivity before it tells me I need to add a thing? Or do you guys just use a different editor?

That checkbox turns it off. - Disable it and you'll only get issues when you build. - The dropdown above it also allows you to change the way issues are displayed to minimal which may also be less distracting for you

 

[Andropov]

I just watched WWDC 25's new Optimize CPU performance with Instruments (a great talk on optimizations, some huge quality of life improvements this year) and it's funny to me how they tried to explain CPU pipelining and instruction level parallelism in the middle of a half hour video on a different topic.

I suspect there's an editorial decision from someone up the chain banning WWDC talks longer than 30 minutes or requiring substantial prior knowledge. Which is a shame, because as much as I appreciate making difficult topics approachable to everyone, it seems to be actively preventing having some advanced talks that I'd love to watch. And I can't shake the feeling that some of these talks end up being too basic for people that aren't new to the topic, yet too unwieldy for newcomers.

 

[casperes1996]

I just watched WWDC 25's new Optimize CPU performance with Instruments (a great talk on optimizations, some huge quality of life improvements this year) and it's funny to me how they tried to explain CPU pipelining and instruction level parallelism in the middle of a half hour video on a different topic.

I suspect there's an editorial decision from someone up the chain banning WWDC talks longer than 30 minutes or requiring substantial prior knowledge. Which is a shame, because as much as I appreciate making difficult topics approachable to everyone, it seems to be actively preventing having some advanced talks that I'd love to watch. And I can't shake the feeling that some of these talks end up being too basic for people that aren't new to the topic, yet too unwieldy for newcomers.

I've made this observation too over the past few years. Back when the presentations where all live in-person they could go for an hour and be much more detailed