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feat: add missing scroll restore action for "See More Posts" title view

This commit is contained in:
CMK 2021-09-29 17:05:40 +08:00
parent 14cefe2d0d
commit 051f436abe
1 changed files with 21 additions and 2 deletions
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23
Mastodon/Scene/HomeTimeline/HomeTimelineViewController.swift
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@ -439,9 +439,16 @@ extension HomeTimelineViewController {
func scrollViewShouldScrollToTop(_ scrollView: UIScrollView) -> Bool {
switch scrollView {
case tableView:
// handle scrollToTop
let indexPath = IndexPath(row: 0, section: 0)
guard viewModel.diffableDataSource?.itemIdentifier(for: indexPath) != nil else {
return true
}
// save position
savePositionBeforeScrollToTop()
return true
// override by custom scrollToRow
tableView.scrollToRow(at: indexPath, at: .top, animated: true)
return false
default:
assertionFailure()
return true
@ -449,6 +456,16 @@ extension HomeTimelineViewController {
}
private func savePositionBeforeScrollToTop() {
// check save action interval
// should not fast than 0.5s to prevent save when scrollToTop on-flying
if let record = viewModel.scrollPositionRecord.value {
let now = Date()
guard now.timeIntervalSince(record.timestamp) > 0.5 else {
// skip this save action
return
}
}
guard let diffableDataSource = viewModel.diffableDataSource else { return }
guard let anchorIndexPaths = tableView.indexPathsForVisibleRows?.sorted() else { return }
guard !anchorIndexPaths.isEmpty else { return }
@ -674,6 +691,8 @@ extension HomeTimelineViewController: HomeTimelineNavigationBarTitleViewDelegate
guard let diffableDataSource = viewModel.diffableDataSource else { return }
let indexPath = IndexPath(row: 0, section: 0)
guard diffableDataSource.itemIdentifier(for: indexPath) != nil else { return }
savePositionBeforeScrollToTop()
tableView.scrollToRow(at: indexPath, at: .top, animated: true)
case .offlineButton:
// TODO: retry