Detect the current top cell in a UITableView after scrolling
You could try using UITableView
's -indexPathsForVisibleRows
or -indexPathForRowAtPoint
.
For example, let's say that you want to print the indexPath of the topmost visible cell, when you stop dragging your table. You could do something like this:
- (void)scrollViewDidEndDragging:(UIScrollView *)scrollView willDecelerate:(BOOL)decelerate{
NSIndexPath *firstVisibleIndexPath = [[self.tableView indexPathsForVisibleRows] objectAtIndex:0];
NSLog(@"first visible cell's section: %i, row: %i", firstVisibleIndexPath.section, firstVisibleIndexPath.row);
}
For Swift 3.0
let topVisibleIndexPath:IndexPath = self.tableView.indexPathsForVisibleRows![0]
You get the index paths for the visible rows
NSArray* indexPaths = [tableView indexPathsForVisibleRows];
Then sort using compare:
NSArray* sortedIndexPaths = [indexPaths sortedArrayUsingSelector:@selector(compare:)];
Then get the first element's row
NSInteger row = [(NSIndexPath*)[sortedIndexPaths objectAtIndex:0] row];