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Fix timeline state restoration not returning to correct scroll position in certain circumstances 

All of the work done by the restoreInitial callback needs to be async,
so that when the TimelineLikeController signals that the loading
indicator should be removed, the collection view is in the right place.

Closes #439
This commit is contained in:
Shadowfacts 2023-12-14 18:28:22 -05:00
parent e09935125f
commit eb61043867
1 changed files with 10 additions and 11 deletions
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21
Tusker/Screens/Timeline/TimelineViewController.swift
View File

@ -420,7 +420,7 @@ class TimelineViewController: UIViewController, TimelineLikeCollectionViewContro
} }
let hasStatusesToRestore = await loadStatusesToRestore(position: position) let hasStatusesToRestore = await loadStatusesToRestore(position: position)
if hasStatusesToRestore { if hasStatusesToRestore {
applyItemsToRestore(position: position) await applyItemsToRestore(position: position)
loaded = true loaded = true
} }
case .mastodon: case .mastodon:
@ -443,7 +443,7 @@ class TimelineViewController: UIViewController, TimelineLikeCollectionViewContro
position.centerStatusID = centerStatusID position.centerStatusID = centerStatusID
let hasStatusesToRestore = await loadStatusesToRestore(position: position) let hasStatusesToRestore = await loadStatusesToRestore(position: position)
if hasStatusesToRestore { if hasStatusesToRestore {
applyItemsToRestore(position: position) await applyItemsToRestore(position: position)
} }
mastodonController.persistentContainer.viewContext.delete(position) mastodonController.persistentContainer.viewContext.delete(position)
} }
@ -532,7 +532,7 @@ class TimelineViewController: UIViewController, TimelineLikeCollectionViewContro
} }
@MainActor @MainActor
private func applyItemsToRestore(position: TimelinePosition) { private func applyItemsToRestore(position: TimelinePosition) async {
var snapshot = NSDiffableDataSourceSnapshot<Section, Item>() var snapshot = NSDiffableDataSourceSnapshot<Section, Item>()
snapshot.appendSections([.statuses]) snapshot.appendSections([.statuses])
let statusIDs = position.statusIDs let statusIDs = position.statusIDs
@ -545,14 +545,13 @@ class TimelineViewController: UIViewController, TimelineLikeCollectionViewContro
"statusIDs": position.statusIDs "statusIDs": position.statusIDs
] ]
SentrySDK.addBreadcrumb(crumb) SentrySDK.addBreadcrumb(crumb)
dataSource.apply(snapshot, animatingDifferences: false) { await apply(snapshot, animatingDifferences: false)
if let centerStatusID, if let centerStatusID,
let index = statusIDs.firstIndex(of: centerStatusID) { let index = statusIDs.firstIndex(of: centerStatusID) {
self.scrollToItem(item: items[index]) self.scrollToItem(item: items[index])
stateRestorationLogger.info("TimelineViewController: restored statuses with center ID \(centerStatusID)") stateRestorationLogger.info("TimelineViewController: restored statuses with center ID \(centerStatusID)")
} else { } else {
stateRestorationLogger.fault("TimelineViewController: restored statuses, but couldn't find center ID") stateRestorationLogger.fault("TimelineViewController: restored statuses, but couldn't find center ID")
}
} }
} }