Ios – Collection <__NSArrayM: 0x7fa1f2711910> was mutated while being enumerated

There are number of questions with similar title but none them of helped me.

but i can relate solution of this 'NSGenericException', reason: Collection <__NSArrayM: 0x7fabb400> was mutated while being enumerated
question with my question. Because this termination is happening
when I'm adding,removing string object with array.

Error :

Terminating app due to uncaught exception 'NSGenericException',
reason: '*** Collection <__NSArrayM: 0x7fa1f2711910> was mutated while being enumerated.'

First throw call stack:

(

0   CoreFoundation                      0x00000001087b8c65 __exceptionPreprocess + 165
1   libobjc.A.dylib                     0x0000000108422bb7 objc_exception_throw + 45
2   CoreFoundation                      0x00000001087b85c4 __NSFastEnumerationMutationHandler + 132
3                                       0x0000000107e24cf5 -[ProfessionalRegSecond tableView:didDeselectRowAtIndexPath:] + 773
4   UIKit                               0x0000000109759d71 -[UITableView _deselectRowAtIndexPath:animated:notifyDelegate:] + 347
5   UIKit                               0x000000010974deea -[UITableView _userSelectRowAtPendingSelectionIndexPath:] + 187
6   UIKit                               0x000000010968062c _applyBlockToCFArrayCopiedToStack + 314
7   UIKit                               0x00000001096804a6 _afterCACommitHandler + 533
8   CoreFoundation                      0x00000001086ebca7 __CFRUNLOOP_IS_CALLING_OUT_TO_AN_OBSERVER_CALLBACK_FUNCTION__ + 23
9   CoreFoundation                      0x00000001086ebc00 __CFRunLoopDoObservers + 368
10  CoreFoundation                      0x00000001086e1a33 __CFRunLoopRun + 1123
11  CoreFoundation                      0x00000001086e1366 CFRunLoopRunSpecific + 470
12  GraphicsServices                    0x000000010d6c8a3e GSEventRunModal + 161
13  UIKit                               0x000000010965c900 UIApplicationMain + 1282
14                                      0x0000000107de14cf main + 111
15  libdyld.dylib                       0x000000010b585145 start + 1
)

libc++abi.dylib: terminating with uncaught exception of type NSException

What I'm trying to do :

I need array in such way that when i select cell i want to add that object to array & when I'm deselecting row i want to remove that row from array so as a result array will be only selected entries. How to do this ?

Here is my code

@implementation Professional

    {
         NSMutableArray *updatedLocalityArray; // alloc,init did in viewDidLoad
         NSString *toCheck;
    }

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath

   {

        UITableViewCell *tableViewCell = [tableView cellForRowAtIndexPath:indexPath];

        NSLog(@"%@",tableViewCell.textLabel.text);

        toCheck = tableViewCell.textLabel.text;
        [updatedLocalityArray addObject:toCheck];
        NSLog(@"%@ *****", updatedLocalityArray);

   }

  - (void)tableView:(UITableView *)tableView didDeselectRowAtIndexPath:(NSIndexPath *)indexPath
    {

        UITableViewCell *tableViewCell = [tableView cellForRowAtIndexPath:indexPath];
           NSLog(@"%@",tableViewCell.textLabel.text);

        for (NSString *test in updatedLocalityArray)
        {
            if ([test isEqualToString:tableViewCell.textLabel.text])
            {

                [updatedLocalityArray removeObject:test];
                NSLog(@"%@ *****", updatedLocalityArray);

            }

        }

    }