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Prepare UX rework:

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- Fix flickering observed on sticky headers when the full table content is displayed
This commit is contained in:
Giom Foret 2017-04-25 14:57:55 +02:00
parent 44166dc616
commit de61103452
1 changed files with 10 additions and 1 deletions
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11
Riot/ViewController/RecentsViewController.m
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@ -509,13 +509,22 @@
- (void)refreshStickyHeadersContainersHeight - (void)refreshStickyHeadersContainersHeight
{ {
// Check whether the full table content is visible.
if (self.recentsTableView.contentSize.height + self.recentsTableView.contentInset.top + self.recentsTableView.contentInset.bottom <= self.recentsTableView.frame.size.height )
{
// No sticky header is required. Hide them to prevent from flickering in case of vertical bounces.
self.stickyHeadersTopContainerHeightConstraint.constant = 0;
self.stickyHeadersBottomContainerHeightConstraint.constant = 0;
return;
}
if (_enableStickyHeaders) if (_enableStickyHeaders)
{ {
// Retrieve the first and the last headers actually visible in the recents table view. // Retrieve the first and the last headers actually visible in the recents table view.
// Caution: In some cases like the screen rotation, some displayed section headers are temporarily not visible. // Caution: In some cases like the screen rotation, some displayed section headers are temporarily not visible.
UIView *firstDisplayedSectionHeader, *lastDisplayedSectionHeader; UIView *firstDisplayedSectionHeader, *lastDisplayedSectionHeader;
CGFloat containerHeight; CGFloat containerHeight;
CGFloat maxVisiblePosY = self.recentsTableView.contentOffset.y + (self.recentsTableView.frame.size.height - self.recentsTableView.contentInset.bottom); CGFloat maxVisiblePosY = self.recentsTableView.contentOffset.y + self.recentsTableView.frame.size.height - self.recentsTableView.contentInset.bottom;
for (UIView *header in displayedSectionHeaders) for (UIView *header in displayedSectionHeaders)
{ {