How to select only two rows in tableview in iOS? - ios

Question

I am trying to allow just two rows to be selected at a time in a table view, but it seems that I can't get a good result!
The idea is that you select one row and this sends an object to core data, then when you select a second row that sends a different thing to core data. But if you select more than two rows, it displays an alert view that says you can only select two rows.
I have tried this:
NSArray *indexPathArray = [[NSArray alloc]init];
indexPathArray = [self.mainTableView indexPathsForSelectedRows];
if ( indexPathArray.count == 1) {
NSLog(#"%#",#"we have 1 cell selected");
}
if ( indexPathArray.count == 2) {
NSLog(#"%#",#"We have 2 cells selected!");
}
if (indexPathArray.count > 2) {
NSLog(#"%#",#"ERROR ERROR!!!");
}
and I have tried many other google and stack overflow suggestions but didn't get to an end!
So how can I achieve this?
This is the method in which I have the code:
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath(NSIndexPath*)indexPath {
[tableView deselectRowAtIndexPath:indexPath animated:YES];
[self setSelection:indexPath];
_profile = [self.fetchedResultsController objectAtIndexPath:indexPath];
NSInteger rowNumber = 0;
for (NSInteger i = 0; i < indexPath.section; i++) {
rowNumber += [self tableView:tableView numberOfRowsInSection:i];
}
rowNumber += indexPath.row;
NSLog(#"%ld",(long)rowNumber);
NSArray *indexPathArray = [[NSArray alloc]init];
indexPathArray = [self.mainTableView indexPathsForSelectedRows];
if ( indexPathArray.count == 1) {
NSLog(#"%#",#"we have 1 cell selected");
}
if ( indexPathArray.count == 2) {
NSLog(#"%#",#"We have 2 cells selected!");
}
if (indexPathArray.count > 2) {
NSLog(#"%#",#"ERROR ERROR!!!");
}
[tableView reloadRowsAtIndexPaths:#[indexPath] withRowAnimation:UITableViewRowAnimationFade]; }

Answer 1

Delete this line:
[tableView deselectRowAtIndexPath:indexPath animated:YES];
from your didSelectRowAtIndexPath: method.

Answer 2

Comment/Delete out the following lines in your code in method
- (void)tableView:(UITableView )tableView didSelectRowAtIndexPath(NSIndexPath)indexPath
[tableView deselectRowAtIndexPath:indexPath animated:YES];
[tableView reloadRowsAtIndexPaths:#[indexPath] withRowAnimation:UITableViewRowAnimationFade];
And check. Your logical part should then work fine.
Explanation: TableView method indexPathsForSelectedRows will return the number of rows selected. And your are deselecting the selected row using this line of code:
[tableView deselectRowAtIndexPath:indexPath animated:YES];
Commenting/deleting only this single line of code will give you indexPathArray count as 1, because you still reload the row at the end of your method using:
[tableView reloadRowsAtIndexPaths:#[indexPath] withRowAnimation:UITableViewRowAnimationFade];
The above piece of code also resets the row to be unselected as you are reloading it. So you need to comment or delete it out too.