If statement based on whatever the previous view controller was - ios

Question

Here is what I go so far:
- (void) tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
UITableViewCell *cell = [tableView cellForRowAtIndexPath:indexPath];
if (preivousViewController isEqualToString:#"...")
{
if ([self.filteredArray count] == 0)
self.person = self.users[indexPath.row];
else
self.person = self.filteredArray[indexPath.row];
self.mugshot = cell.imageView.image;
[self performSegueWithIdentifier:#"SelectPerson" sender:self];
} else {
if ([self.filteredArray count] == 0)
self.person = self.users[indexPath.row];
else
self.person = self.filteredArray[indexPath.row];
self.mugshot = cell.imageView.image;
[self performSegueWithIdentifier:#"selectVisitee" sender:self];
}
}
It looks messy, that's why im trying to fix it up (that previousViewController part is just made up to show you what I want to try to do).
What im trying to say is: If how you got to this view was via this segue, or from that view controller with the name suchandsuch, then preform this segue or that segue. Is there a way I can do that?

Answer 1

You can check the previous ViewController of the stack from the Navigation Controller.
- (void) tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
UITableViewCell *cell = [tableView cellForRowAtIndexPath:indexPath];
if ([self.filteredArray count] == 0)
self.person = self.users[indexPath.row];
else
self.person = self.filteredArray[indexPath.row];
self.mugshot = cell.imageView.image;
//Not the viewcontroller name string. Use the ViewController class name
if ([self backViewController] == YOURVIEWCONTROLLER)
{
[self performSegueWithIdentifier:#"SelectPerson" sender:self];
} else {
[self performSegueWithIdentifier:#"selectVisitee" sender:self];
}
}
Use this below method,
- (UIViewController *)backViewController
{
NSInteger numberOfViewControllers = self.navigationController.viewControllers.count;
if (numberOfViewControllers < 2)
return nil;
else
return [self.navigationController.viewControllers objectAtIndex:numberOfViewControllers - 2];
}