TomUviandClaude Opus 5
f84852d49c
The skill so far only held what we broke ourselves. Most of what is worth knowing about a new SDK is found rather than suffered — release notes, other people's articles — and that deserves a place too, on terms that stay fair to whoever wrote it. So: entries in our own words, source named and linked, and the one thing no external article can supply — what it would replace in our code and whether it is genuinely a step forward. Attribution answers plagiarism, not copyright, so nothing is pasted; an API signature is a fact, the paragraph explaining it is not ours to take. First four entries come from Natalia Panferova's writing at nilcoalescing .com: the close button role and concentric corners, both of which replace things we hand-built; ScrollPosition, which replaces one wrapper view; and the iOS 27 toolbar APIs, which we cannot use at our deployment target but which would delete a workaround the day we can. A LICENSE was overdue and now says plainly what is ours, what is Apple's and stays out of the repository, and what belongs to the authors we cite. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
37 lines
1.4 KiB
Markdown
37 lines
1.4 KiB
Markdown
# Programmatic scrolling
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## `ScrollPosition` instead of `ScrollViewReader`
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**What it is.** A `ScrollPosition` value held in `@State` and attached with
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`.scrollPosition($position)` replaces wrapping content in a
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`ScrollViewReader` to get at a proxy. Scrolling is then a method call on
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the state — `position.scrollTo(id:)` — and, unlike the proxy, the value
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can also be read, so the position is available both ways.
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```swift
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@State private var position = ScrollPosition()
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ScrollView(.horizontal) {
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HStack { ForEach(items) { ItemView(item: $0).id($0.id) } }
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}
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.scrollPosition($position)
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```
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Related, same family: `.defaultScrollAnchor(.bottom)` for where a view
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starts out, and `onScrollGeometryChange(for:of:action:)` (iOS 18) for
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following the offset while the user drags.
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**What it replaces.** A `ScrollViewReader` wrapped around content purely
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to reach `proxy.scrollTo` from a `.task`. In our card list that is the
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filter chip strip, which scrolls the active chip into view.
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**Step forward?** Modest but real. One layer of nesting disappears and the
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scroll position stops being write-only. Not urgent — the existing code
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works — so worth doing when that view is touched for another reason.
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**Available since.** iOS 17, so nothing blocks it at our deployment
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target. `onScrollGeometryChange` needs iOS 18.
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**Source.** Natalia Panferova, "Modern SwiftUI APIs for programmatic
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scrolling", nilcoalescing.com, 19 May 2026. Read 16 Aug 2026.
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