"Make a Custom UIGestureRecognizer in Objective-C" Touches Moved Method.

ZLetterGestureRecognizer.m

-(void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event
{
   [super touchesMoved:touches withEvent:event];    //A
   if ((self.state == UIGestureRecognizerStateFailed) || (self.state == UIGestureRecognizerStateRecognized)) {    //B 
      return;
   }
   UIView *superView = [self.view superview];     //C
   CGPoint currentPoint = [touches.anyObject locationInView:superView];
   CGPoint previousPoint = [touches.anyObject previousLocationInView:superView];
   if ((self.strokePart == 0) && ((currentPoint.x — self.firstTap.x) > 20.00) && (currentPoint.x > previousPoint.x) && 
      ((currentPoint.y — self.firstTap.y) <= self.strokePrecision)) {     //D
           NSLog(@”Stroke part 1 complete”);      //E
           self.strokePart = 1;                   //F
   } else if ((self.strokePart == 1) && (currentPoint.x < previousPoint.x) && (currentPoint.y > previousPoint.y)) {    //G
           NSLog(@”Stroke part 2 complete”);
           self.strokePart = 2;                   //H
   } else if ((self.strokePart == 2) && (currentPoint.x > previousPoint.x) && ((currentPoint.y — previousPoint.y) <= 
             self.strokePrecision)) {       //I
           self.strokePart = 3;
           self.state = UIGestureRecognizerStateRecognized;     //J
           NSLog(@”Gesture Recognized!”);
   }
}