How to get unique letter from CCLabelTTF sprite when touch moved in cocos2d

Question

I have a 8x8 matrix of alphabet letters game,when I move touch into label,label value repeated,how to overcome this problem,letters are in random position in 8x8 matrix.

-(void)ccTouchesMoved:(NSSet *)touches withEvent:(UIEvent *)event{
   UITouch *touch=[touches anyObject];
   CGPoint newlocation=[touch locationInView:[touch view]];

   newlocation=[[CCDirector sharedDirector] convertToGL:newlocation];
   for (int i=0; i<GRID_WIDTH; i++) {
      for (int j=0; j<GRID_HEIGHT; j++) {
         if (CGRectContainsPoint([grid[i][j].letter boundingBox],newlocation)) {
            CCLOG(@"letters %@",[grid[i][j].letter string]);
            [letterarray addObject:[grid[i][j].letter string]];
         }
      }
   }
}

Answer 1

ah ... too many touchMoved updates in a single grid element ! try this

     if (CGRectContainsPoint([grid[i][j].letter boundingBox],newlocation)) {
        CCLOG(@"letters %@",[grid[i][j].letter string]);
        NSString *thisLetter = [grid[i][j].letter string];
        if (![letterArray containsObject:thisLetter]) {
            [letterarray addObject:thisLetter];
        } else {
            NSLog(@"*** Skipping letter, [%@] already in the array",thisLetter);
        }
     }