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Update reloadDataAndKeepOffset function.

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This commit is contained in:
azurechen
2017-10-28 21:39:33 +08:00
parent 85550aba79
commit 0832ba3e64
1 changed files with 9 additions and 8 deletions
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Sources/Views/MessagesCollectionView.swift
+9 -8
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@@ -70,18 +70,19 @@ open class MessagesCollectionView: UICollectionView {
public func reloadDataAndKeepOffset() {
// stop scrolling
self.setContentOffset(self.contentOffset, animated: false)
setContentOffset(contentOffset, animated: false)
// calculate the offset and reloadData
let beforeContentSize = self.contentSize
self.reloadData()
self.layoutIfNeeded()
let afterContentSize = self.contentSize
let beforeContentSize = contentSize
reloadData()
layoutIfNeeded()
let afterContentSize = contentSize
// reset the contentOffset after data is updated
self.setContentOffset(CGPoint(
x: self.contentOffset.x + (afterContentSize.width - beforeContentSize.width),
y: self.contentOffset.y + (afterContentSize.height - beforeContentSize.height)), animated: false)
let newOffset = CGPoint(
x: contentOffset.x + (afterContentSize.width - beforeContentSize.width),
y: contentOffset.y + (afterContentSize.height - beforeContentSize.height))
setContentOffset(newOffset, animated: false)
}
}