Set checkmark in UITableView [duplicate] - ios

Question

This question already has an answer here:
TableView Cell reuse and unwanted checkmarks - this is killing me
(1 answer)
Closed 9 years ago.
I'm trying to set checkmark in rows which are selected in UITableView (placed in popup view). Actually I have something like this:
-(NSIndexPath *)tableView:(UITableView *)tableView willSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
// Check if current row is selected
Boolean isNowChecked = NO;
if([self.tableView cellForRowAtIndexPath:indexPath].accessoryType == UITableViewCellAccessoryCheckmark)
{
isNowChecked = YES;
}
if(isNowChecked)
{
[self.tableView cellForRowAtIndexPath:indexPath].accessoryType = UITableViewCellAccessoryNone;
}
else
{
[self.tableView cellForRowAtIndexPath:indexPath].accessoryType = UITableViewCellAccessoryCheckmark;
}
return indexPath;
}
In result I'm able to select rows, for example I touch first item then I see checkmark. When I scroll down my table view, then I see that I have check also other items (number 17, 32). When I uncheck my first item, then every check also disappear.
Do you have any suggestions what could be reason of this situation, and how can I avoid it?

Answer 1

// Try this
//in .h
NSMutableArray *arr_fortable;
//in .m
- (void)viewDidLoad
{
[super viewDidLoad];
arr_fortable = [[NSMutableArray alloc] init];
for (int i =0; i<5; i++)
{
NSMutableDictionary *dict = [[NSMutableDictionary alloc] init];
[dict setObject:[NSString stringWithFormat:#"%d",i+1] forKey:#"data"];
[dict setObject:#"0" forKey:#"checkmark"];
[arr_fortable addObject:dict];
}
}
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
// Return the number of sections.
return 1;
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
// Return the number of rows in the section.
return [arr_fortable count];
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
static NSString *CellIdentifier = #"Cell";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if (cell == nil) {
cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier] autorelease];
}
// Configure the cell...
cell.textLabel.text = [[arr_fortable objectAtIndex:indexPath.row] objectForKey:#"data"];
if ([[[arr_fortable objectAtIndex:indexPath.row] objectForKey:#"checkmark"] integerValue] == 1)
{
cell.accessoryType = UITableViewCellAccessoryCheckmark;
}
else
{
cell.accessoryType = UITableViewCellAccessoryNone;
}
return cell;
}
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
if ([[[arr_fortable objectAtIndex:indexPath.row] objectForKey:#"checkmark"] integerValue] == 1)
{
[[arr_fortable objectAtIndex:indexPath.row] setObject:#"0" forKey:#"checkmark"];
}
else
{
[[arr_fortable objectAtIndex:indexPath.row] setObject:#"1" forKey:#"checkmark"];
}
[self.tableView reloadData];
}

Answer 2

see this..
tableView:didSelectRowAtIndexPath: and update which data is checked in tableView:cellForRowAtIndexPath: like this:
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
// do usual stuff here including getting the cell
// determine the data from the IndexPath.row
if (data == self.checkedData)
{
cell.accessoryType = UITableViewCellAccessoryCheckmark;
} else {
cell.accessoryType = UITableViewCellAccessoryNone;
}
return cell;
}
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
// determine the selected data from the IndexPath.row
if (data != self.checkedData) {
self.checkedData = data;
}
[tableView reloadData];
}