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Comment by manmal | Hacker News Reader

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manmal·

AsyncSequence is good to go with iOS 13+ now, you can start using it right away.

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https://github.com/apple/swift-async-algorithms

Requires Xcode 14, which is still in beta and cannot push to the App Store.

Also, Apple fucked their back port badly. It’s supposedly fixed now, but if you built an app that used async/await anywhere in Xcode 13.X and a user installed running iOS 12/13/up to 14.5 they’d crash on launch.

So I personally wouldn’t trust it, and instead just push to raise your iOS minimum. I’ve had no problems requiring iOS15 in my projects over 1M installs

swift-async-algorithms can be used in earlier versions of Xcode if you checkout an earlier tag. They just moved forward more quickly.

Async / await's backport no longer causes crashes in Xcode 13.4, but it does have the downside of being the Swift 5.5 runtime, which has several unfixed issues, unfortunately.

> it does have the downside of being the Swift 5.5 runtime, which has several unfixed issues, unfortunately.

any links for this? im curious as im using async/await on xcode 13.4 currently.

Can't find them at the moment (check the Swift forums), but the two big issues I've seen reported are both in TaskGroup. One is a runtime crash under certain conditions, the other a major performance bottleneck when adding thousands of child tasks to a group. Both have workarounds, but they can hit you when using back deployment or any OS that has the 5.5 runtime (iOS 15 - 15.3 for instance). Wouldn't be showstoppers for me, just something to be aware of.

got it, thanks, i'll check the forums again!

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