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Improve position maintenance

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This commit is contained in:
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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24
View Controllers/TableViewController.swift
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@ -275,22 +275,21 @@ private extension TableViewController {
}
func update(_ update: CollectionUpdate) {
var offsetFromNavigationBar: CGFloat?
let positionMaintenanceOffset: CGFloat
if
let itemId = update.maintainScrollPositionItemId,
let indexPath = dataSource.indexPath(itemId: itemId),
let navigationBar = navigationController?.navigationBar {
let navigationBarMaxY = tableView.convert(navigationBar.bounds, from: navigationBar).maxY
offsetFromNavigationBar = tableView.rectForRow(at: indexPath).origin.y - navigationBarMaxY
if let itemId = update.maintainScrollPositionItemId,
let indexPath = dataSource.indexPath(itemId: itemId) {
positionMaintenanceOffset = tableView.rectForRow(at: indexPath).origin.y
- tableView.safeAreaInsets.top - tableView.contentOffset.y
} else {
positionMaintenanceOffset = 0
}
self.dataSource.apply(update.items.snapshot(), animatingDifferences: false) { [weak self] in
guard let self = self else { return }
if
let itemId = update.maintainScrollPositionItemId,
let indexPath = self.dataSource.indexPath(itemId: itemId) {
if let itemId = update.maintainScrollPositionItemId,
let indexPath = self.dataSource.indexPath(itemId: itemId) {
if update.shouldAdjustContentInset {
self.tableView.contentInset.bottom = max(
self.tableView.safeAreaLayoutGuide.layoutFrame.height
@ -299,10 +298,7 @@ private extension TableViewController {
}
self.tableView.scrollToRow(at: indexPath, at: .top, animated: false)
if let offsetFromNavigationBar = offsetFromNavigationBar {
self.tableView.contentOffset.y -= offsetFromNavigationBar
}
self.tableView.contentOffset.y -= positionMaintenanceOffset
}
}
}