Programmatically highlight UITableView cell
Solution 1
I found this to be completely unfixable using all known possibilities. In the end I fixed it by ditching a lot of my code and switching to NSFetchedResultsController instead. NSFetchedResultsController was introduced shortly after I originally wrote this app, and it greatly simplifies the process of using Core Data with UITableViews. https://developer.apple.com/library/IOs/documentation/CoreData/Reference/NSFetchedResultsController_Class/index.html
Solution 2
Please be sure the cell's selectionStyle
is UITableViewCellSelectionStyleBlue
and the tableView's allowsSelection
is set to YES
.
The method selectRowAtIndexPath:animated:scrollPosition:
works fine for me. It does highlight the selected cell.
Solution 3
I went through and tried all these and other solutions and no joy. In my case the problem (which drove me nuts for 2 hrs) was the following - shortly after I was calling selectRowAtIndexPath
, I was calling reloadData
on the tableview
. That reload was wiping all the highlighting! Beware of this pitfall! With the unnecessary reloading of data call gone, the highlighting happenned as expected.
Solution 4
I also tried many approaches to get the initial selection to display on my single-selection UITableView. What finally worked for me was to defer the selection of the initial row until the table was set up by calling it in my UITableViewController's viewDidAppear:
override func viewDidAppear(animated: Bool)
{
tableView.selectRowAtIndexPath(indexPathToSelectInitially, animated: false, scrollPosition: .None)
}
Solution 5
I found this and it works for me (aka calling the delegate method didSelectRowAtIndexPath)
NSIndexPath *defaultIndexPath = [NSIndexPath indexPathForRow:0 inSection:0];
[self tableView:[self tableView] didSelectRowAtIndexPath:defaultIndexPath];
PS. I'm using UITableViewController.
beev
Updated on June 04, 2022Comments
-
beev about 2 years
I have an iPad app which uses a UISplitViewController (with a UITableView on the left and a detail view on the right). My table view highlights the selected cell in blue when you tap on it.
When I call the following method, the cell is selected but not highlighted in blue:
[self.tableView selectRowAtIndexPath:indexPath animated:YES scrollPosition:UITableViewScrollPositionTop];
I have spent literally days fiddling about with various delegate methods and hacks trying to get the cell to highlight programatically just as if it had been tapped. I can't do it.
I've managed to almost get there with this:
- (void)tableView:(UITableView *)tableView willDisplayCell:(UITableViewCell *)cell forRowAtIndexPath:(NSIndexPath *)indexPath { if (shouldHighlightCell) { NSIndexPath *indexPathForCellToHighlight = [NSIndexPath indexPathForRow:0 inSection:0]; if ([indexPath isEqual:indexPathForCellToHighlight]) { cell.selected = YES; shouldHighlightCell = NO; } } }
It works as long as I also have this (otherwise it remains selected even when another cell is tapped):
- (NSIndexPath *)tableView:(UITableView *)tableView willSelectRowAtIndexPath:(NSIndexPath *)indexPath { NSIndexPath *ip = [NSIndexPath indexPathForRow:0 inSection:0]; if ([[self.tableView cellForRowAtIndexPath:ip] isSelected]) { [[self.tableView cellForRowAtIndexPath:ip] setSelected:NO]; } NSIndexPath *iToTheP = indexPath; return iToTheP; }
I know this is a weird and convoluted workaround. I wouldn't mind, but it doesn't even work fully. The selected cell loses its highlight if it is scrolled off screen, whereas a cell that has been tapped remains highlighted when scrolled off screen.
I'm absolutely baffled by this. I'm sure this workaround shouldn't even be necessary, that there is a much simpler solution.