Select only one cell UITableView - objective-c

Question

I have a table view with numerous cells. When I press one, a tick appears beside it, but when I select another, the tick on the previous one remains, and a new tick is added on the current cell. so two cells are ticked, but only one at a time must be ticked!!
I tried this, but it does not work:
if (cell.selected = YES) {
[cell setSelected:NO animated:YES];
[cell setAccessoryType:UITableViewCellAccessoryNone];
}else if(cell.selected = NO){
[cell setSelected: YES animated:YES];
[cell setAccessoryType:UITableViewCellAccessoryCheckmark];
}

Answer 1

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
int newRow = [indexPath row];
int oldRow = [lastIndexPath row];
if (newRow != oldRow)
{
UITableViewCell *newCell = [tableView cellForRowAtIndexPath:
indexPath];
newCell.accessoryType = UITableViewCellAccessoryCheckmark;
UITableViewCell *oldCell = [tableView cellForRowAtIndexPath:
lastIndexPath];
oldCell.accessoryType = UITableViewCellAccessoryNone;
lastIndexPath = indexPath;
}
[tableView deselectRowAtIndexPath:indexPath animated:YES];
}
OR
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
UITableViewCell *cell = [tableView cellForRowAtIndexPath:indexPath];
if (cell.accessoryType == UITableViewCellAccessoryNone) {
cell.accessoryType = UITableViewCellAccessoryCheckmark;
} else {
cell.accessoryType = UITableViewCellAccessoryNone;
}
}

Answer 2

An alternative:
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
UITableViewCell *cell = [tableView cellForRowAtIndexPath:indexPath];
for (int i = 0; i<yourArray.count;i++)
{
if(i!=[indexPath row])
{
cell = [tableView cellForRowAtIndexPath:[NSIndexPath indexPathForRow:i inSection:0]];
cell.accessoryType = UITableViewCellAccessoryNone;
}
}
cell = [tableView cellForRowAtIndexPath:indexPath];
if (cell.accessoryType == UITableViewCellAccessoryNone) {
cell.accessoryType = UITableViewCellAccessoryCheckmark;
} else {
cell.accessoryType = UITableViewCellAccessoryNone;
}
}
This physically goes through all of the rows and disables them. Kind of brute force, but it works. If you want a version that doesn't allow deselecting,
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
UITableViewCell *cell = [tableView cellForRowAtIndexPath:indexPath];
for (int i = 0; i<yourArray.count;i++)
{
cell = [tableView cellForRowAtIndexPath:[NSIndexPath indexPathForRow:i inSection:0]];
cell.accessoryType = UITableViewCellAccessoryNone;
}
cell = [tableView cellForRowAtIndexPath:indexPath];
cell.accessoryType = UITableViewCellAccessoryCheckmark;
}

Answer 3

The quick fix in Swift:
var lastIndexPath:NSIndexPath = NSIndexPath(forRow: 0, inSection: 0)
override func tableView(tableView: UITableView, didSelectRowAtIndexPath indexPath: NSIndexPath) {
let newRow = indexPath.row
let oldRow = lastIndexPath.row
if oldRow != newRow {
tableView.cellForRowAtIndexPath(indexPath)?.accessoryType = .Checkmark
tableView.cellForRowAtIndexPath(lastIndexPath)?.accessoryType = .None
lastIndexPath = indexPath
}
tableView.deselectRowAtIndexPath(indexPath, animated: true)
}

Answer 4

In the tableviewdatasource you need to follow this:
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
static NSString *CellIdentifier = #"Cell";
UITableViewCell* cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if(cell == nil )
{
cell =[[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:CellIdentifier] autorelease];
}
if ([indexPath compare:self.lastIndexPath] == NSOrderedSame)
{
cell.accessoryType = UITableViewCellAccessoryCheckmark;
}
else
{
cell.accessoryType = UITableViewCellAccessoryNone;
}
return cell;
}
// UITableView Delegate Method
-(void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
self.lastIndexPath = indexPath;
[tableView reloadData];
}
the lastindex is property(retain) NSIndexPath* lastIndexPath;