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

You can use some attribute to check if the code was already called when you were entering specific area. It looks like highlighted state of p1 object (not sure what it is) may be appropriate for that:

if(CGRectContainsPoint(p1.frame, location))
{
   if (!p1.isHighlighted){ // We entered the area but have not run highlighting code yet
        //I only want the below to me called 
        // once while I am inside this frame
      [self pP01];
      [p1 setHighlighted:YES];
   }
}else { // We left the area - so we'll call highlighting code when we enter next time
    [p1 setHighlighted:NO];
}