How to call a method only once during -(void)touchesMoved?

Question

I am using - (void) touchesMoved to do stuff when ever I enter a specific frame, in this case the area of a button.

My problem is, I only w

Answer 1

if( CGRectContainsPoint([p1 frame],[touch locationInView:self.view])) {
   NSLog (@"Touch Moved over p1");
  if (!p14.isHighlighted) {
   [self action: p1];
   p1.highlighted = YES; 
   }
  }else {
   p1.highlighted = NO;
  }