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Merge pull request #1658 from PortablePixels/master

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Improvement in logic for scrollToLastItem
This commit is contained in:
Jakub Kašpar
2022-01-04 10:00:39 +01:00
committed by GitHub
parent 33581c96c9 88604e9441
commit 2a35fbb9c3
1 changed files with 11 additions and 10 deletions
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Sources/Views/MessagesCollectionView.swift
+11 -10
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@@ -46,9 +46,16 @@ open class MessagesCollectionView: UICollectionView {
internal var showMessageTimestampOnSwipeLeft: Bool = false
private var indexPathForLastItem: IndexPath? {
let lastSection = numberOfSections - 1
guard lastSection >= 0, numberOfItems(inSection: lastSection) > 0 else { return nil }
return IndexPath(item: numberOfItems(inSection: lastSection) - 1, section: lastSection)
guard numberOfSections > 0 else { return nil }
for offset in 1...numberOfSections {
let section = numberOfSections - offset
let lastItem = numberOfItems(inSection: section) - 1
if lastItem >= 0 {
return IndexPath(item: lastItem, section: section)
}
}
return nil
}
open var messagesCollectionViewFlowLayout: MessagesCollectionViewFlowLayout {
@@ -108,14 +115,8 @@ open class MessagesCollectionView: UICollectionView {
// NOTE: It's possible for small content size this wouldn't work - https://github.com/MessageKit/MessageKit/issues/725
public func scrollToLastItem(at pos: UICollectionView.ScrollPosition = .bottom, animated: Bool = true) {
guard numberOfSections > 0 else { return }
guard let indexPath = indexPathForLastItem else { return }
let lastSection = numberOfSections - 1
let lastItemIndex = numberOfItems(inSection: lastSection) - 1
guard lastItemIndex >= 0 else { return }
let indexPath = IndexPath(row: lastItemIndex, section: lastSection)
scrollToItem(at: indexPath, at: pos, animated: animated)
}