Set value of variable after selecting row and add checkmark (xcode) - xcode

Question

I'd like to do following: After clicking a row in a tableview, I want to set value of some variable and in the same time change the cell accessory type to checkmark. Here is my implementation file:
- (void)viewDidLoad
{
[super viewDidLoad];
tabledata = [[NSArray alloc] initWithObjects:#"row1", #"row2", #"row3", nil];
// Do any additional setup after loading the view.
}
- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
#pragma mark - TableView Data Source methods
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
return [tabledata count];
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
UITableViewCell *cell = nil;
cell = [tableView dequeueReusableCellWithIdentifier:#"Row"];
if (cell == nil)
{
cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:#"Row"];
}
cell.textLabel.text = [tabledata objectAtIndex:indexPath.row];
return cell;
}
#pragma mark TableVoew Delegate methods
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
//if row1 is selected change 'value' to 1 and change cell accessory to checkmark (other cells accessory to none)
//if row2 is selected change 'value' to 2 and change cell accessory to checkmark (other cells accessory to none)
//if row3 is selected change 'value' to 2 and change cell accessory to checkmark (other cells accessory to none)
}

Answer 1

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
self.value = indexPath.row;
UITableViewCell *cell = [self.tableView cellForRowAtIndexPath:nowIndex];
cell.accessoryType = UITableViewCellAccessoryCheckmark;
}
EDIT
Set only the accessory for selected row in - (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
cell.accessoryType = UITableViewAccessoryNone;
if (indexPath.row == self.value) {
cell.accessoryType = UITableViewCellAccessoryCheckmark;
}
See this to remove checkmarks from currently visible cells in tableview.
EDIT 2
To unselect the previous row, do this in didSelectRowAtIndexPath
NSIndexPath *oldIndexPath = [NSIndexPath indexPathForRow:index inSection:1];
NSLog(#"Oldindexpath is: %#", oldIndexPath);
UITableViewCell *newCell = [tableView cellForRowAtIndexPath:indexPath];
if (newCell.accessoryType == UITableViewCellAccessoryNone) {
newCell.accessoryType = UITableViewCellAccessoryCheckmark;
}
UITableViewCell *oldCell = [tableView cellForRowAtIndexPath:oldIndexPath];
if (oldCell != newCell){
if (oldCell.accessoryType == UITableViewCellAccessoryCheckmark) {
oldCell.accessoryType = UITableViewCellAccessoryNone;
}
}

Answer 2

This solved my problem with removing old checkmarks:
for (UITableViewCell *cell in [tableView visibleCells]) {
cell.accessoryType = UITableViewCellAccessoryNone;
}
UITableViewCell *cell = [tableView cellForRowAtIndexPath:indexPath];
cell.accessoryType = UITableViewCellAccessoryCheckmark;
and problem with setting value of current row was solved in previous answer.