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Jake Nelson

Swift gurus are these two equivalent?

Trying to get a ScrollView to jump back to the previous first item when new items are added and even in a test project this seems to be required before it works reliably!

This itself is in an .onChange modifier listening to the items if that helps with context

#swift #iOSdev

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Phillip Caudell :nsb:
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@jknlsn scrollTo isn't labeled as MainActor/Sendable, so I’d be wary of calling it from inside a Task.

It's likely your onChange is being fired before the view has had a chance to redraw, so there's nothing to scroll to yet.

· · Ivory for Mac · 1 · 0 · 2
Jake Nelson

@phill ah, thanks!

Any ideas on ways to prevent this until the view is redrawn? Or just .asyncAfter and hope for the best haha 🤔

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Phillip Caudell :nsb:

@jknlsn You could try .task(id: currentFirst) { //do scroll from main actor }, otherwise… mastodon.notsobig.co/@phill/11

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Kay

@jknlsn @phill You can also mark the Task as running on the MainActor or use MainActor.run to manually dispatch to it.

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Kay

@jknlsn @phill Just realized, when doing this from SwiftUI, your task will automatically inherit the MainActor context from the view. So it should be fine.

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