UITableView Accessory Button Segue Not working - ios

Question

I'm having big problems learning how to pass data from the cell accessory button to the detail view controller with segues. If I tap the cell the data is passed to the detail view controller in a NSString *selectedItem; and the label on the other view updates with the word that was in the cell -
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
[self performSegueWithIdentifier:#"toDetail" sender:self];
}
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {
if ([segue.identifier isEqualToString:#"toDetail"]) {
NSIndexPath *indexPath = [self.tableView indexPathForSelectedRow];
DrugDetailViewController *destViewController = segue.destinationViewController;
destViewController.selectedItem = [[candyArray objectAtIndex:[indexPath row]] name];
}
}
And i connect a segue on the storyboard from the cell to the detail view with a name "toDeatil" It works when i click the cell it goes to the detail screen, but if i put
- (void)tableView:(UITableView *)tableView accessoryButtonTappedForRowWithIndexPath:(NSIndexPath *)indexPath
{
[self performSegueWithIdentifier:#"toDetail" sender:self];
}
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {
if ([segue.identifier isEqualToString:#"toDetail"]) {
NSIndexPath *indexPath = [self.tableView indexPathForSelectedRow];
DrugDetailViewController *destViewController = segue.destinationViewController;
destViewController.selectedItem = [[candyArray objectAtIndex:[indexPath row]] name];
}
}
Almost exactly the same but from the accessorybutton and I connect a segue on the storyboard from the cell accessorybutton to the detail view with a name "toDetail" when I click the cell it goes to the detail screen, but the information is not there, the label dosent get filled out or just uses the first cell detail all the time.
I've tried heaps of combinations. I've tried making my own accessory button, a UIButton in a custom cell but it just uses the first cells details all the time.
The goal is to get didSelectRowAtIndexPath going to one view and accessoryButtonTappedForRowWithIndexPath going to a different view but I need to tell accessoryButtonTappedForRowWithIndexPath what cell was pressed.
Hope this makes sence.
Thank you

Answer 1

You can pass the indexPath as sender to the performSegueWithIdentifier call, like this:
- (void)tableView:(UITableView *)tableView accessoryButtonTappedForRowWithIndexPath:(NSIndexPath *)indexPath
{
[self performSegueWithIdentifier:#"toDetail" sender:indexPath];//IndexPath as sender
}
And in your prepareForSegue method:
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {
if ([segue.identifier isEqualToString:#"toDetail"]) {
//Detect sender class and act accordingly
NSIndexPath *indexPath = [sender isKindOfClass:[NSIndexPath class]] ? (NSIndexPath*)sender : [self.tableView indexPathForSelectedRow];
DrugDetailViewController *destViewController = segue.destinationViewController;
destViewController.selectedItem = [[candyArray objectAtIndex:[indexPath row]] name];
}
}

Answer 2

You don't need to implement accessoryButtonTappedForRowWithIndexPath.
When prepareForSegue is fired from an accessory view, the sender:(id)sender parameter is set to the UITableViewCell which contains the accessory view. You can then ask the table view for the index of that cell (not the selected index).
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {
if ([segue.identifier isEqualToString:#"toDetail"] && [sender isKindOfClass:[UITableViewCell class]]) {
NSIndexPath *indexPath = [self.tableView indexPathForCell:sender];
DrugDetailViewController *destViewController = segue.destinationViewController;
destViewController.selectedItem = [[candyArray objectAtIndex:[indexPath row]] name];
}
}

Answer 3

That is because [self.tableView indexPathForSelectedRow] will return a NSIndexPath only if the ROW is tapped, not when the accessory button is tapped.
In accessoryButtonTappedForRowWithIndexPath, you will need to pass indexPath.row to the prepareForSegue method manually. Try this:
NSInteger selectedRow;
- (void)tableView:(UITableView *)tableView accessoryButtonTappedForRowWithIndexPath:(NSIndexPath *)indexPath
{
selectedRow = indexPath.row;
[self performSegueWithIdentifier:#"toDetail" sender:self];
}
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
{
if ([segue.identifier isEqualToString:#"toDetail"])
{
DrugDetailViewController *destViewController = segue.destinationViewController;
destViewController.selectedItem = [[candyArray objectAtIndex:selectedRow] name];
}
}

Answer 4

What about, if you drive state of what is selected on application delegate! Answer of Raul Juarez do the work, but the target of sender parameter is other!
I have an app that use UITableView, and i need to know what item was touched on accessory button in above screen!
To manage this scenery, i have one property on application delegate, that i update when i touch table view accessory button; so in the next screen, i can retrieve the item touched reading the property of application delegate.
In general, i use de application delegate to code model application (dividing necessary class), so views instances only interact with this model to update necessary states! what i do is focus view work independent of model work!
Maybe some like this:
// Property on Application Delegate
#propety (atomic,readwrite) NSIndexPath* indexTapped;
// Method on UITableViewDelegate instance
- (void)tableView:(UITableView *)tableView accessoryButtonTappedForRowWithIndexPath:(NSIndexPath *)indexPath
{
UIMyAppDelegate* model = (UIMyAppDelegate*)[[UIApplication shared] delegate];
model.indexTapped = indexPath;
[self performSegueWithIdentifier:#"toDetail" sender:self];
}
// Method on another View Controller
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {
UIMyAppDelegate* model = (UIMyAppDelegate*)[[UIApplication shared] delegate];
if ([segue.identifier isEqualToString:#"toDetail"]) {
NSIndexPath *indexTapped = model.indexSelected;
DrugDetailViewController *destViewController = segue.destinationViewController;
destViewController.selectedItem = [[candyArray objectAtIndex:[indexPath row]] name];
}
}