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Improve position maintenance

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Justin Mazzocchi 2021-01-16 18:47:43 -08:00
parent d42642c079
commit a672e97441
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GPG key ID: E223E6937AAFB01C
1 changed files with 10 additions and 14 deletions
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22
View Controllers/TableViewController.swift
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@ -275,21 +275,20 @@ private extension TableViewController {
} }
func update(_ update: CollectionUpdate) { func update(_ update: CollectionUpdate) {
var offsetFromNavigationBar: CGFloat? let positionMaintenanceOffset: CGFloat
if if let itemId = update.maintainScrollPositionItemId,
let itemId = update.maintainScrollPositionItemId, let indexPath = dataSource.indexPath(itemId: itemId) {
let indexPath = dataSource.indexPath(itemId: itemId), positionMaintenanceOffset = tableView.rectForRow(at: indexPath).origin.y
let navigationBar = navigationController?.navigationBar { - tableView.safeAreaInsets.top - tableView.contentOffset.y
let navigationBarMaxY = tableView.convert(navigationBar.bounds, from: navigationBar).maxY } else {
offsetFromNavigationBar = tableView.rectForRow(at: indexPath).origin.y - navigationBarMaxY positionMaintenanceOffset = 0
} }
self.dataSource.apply(update.items.snapshot(), animatingDifferences: false) { [weak self] in self.dataSource.apply(update.items.snapshot(), animatingDifferences: false) { [weak self] in
guard let self = self else { return } guard let self = self else { return }
if if let itemId = update.maintainScrollPositionItemId,
let itemId = update.maintainScrollPositionItemId,
let indexPath = self.dataSource.indexPath(itemId: itemId) { let indexPath = self.dataSource.indexPath(itemId: itemId) {
if update.shouldAdjustContentInset { if update.shouldAdjustContentInset {
self.tableView.contentInset.bottom = max( self.tableView.contentInset.bottom = max(
@ -299,10 +298,7 @@ private extension TableViewController {
} }
self.tableView.scrollToRow(at: indexPath, at: .top, animated: false) self.tableView.scrollToRow(at: indexPath, at: .top, animated: false)
self.tableView.contentOffset.y -= positionMaintenanceOffset
if let offsetFromNavigationBar = offsetFromNavigationBar {
self.tableView.contentOffset.y -= offsetFromNavigationBar
}
} }
} }
} }