Objective C: Detect start of bouncing effect for UIScrollView?

Objective C: Detect start of bouncing effect for UIScrollView?

static BOOL _draggingView = NO;


- (void)scrollViewWillBeginDragging:(UIScrollView *)scrollView {


        _draggingView = YES;


}



- (void)scrollViewDidEndDragging:(UIScrollView *)scrollView willDecelerate:
(BOOL)decelerate {


       _draggingView = NO;


}



- (void)scrollViewDidScroll:(UIScrollView *)scrollView {

        NSInteger pullingDetectFrom = 50;

 
       if (self.contentOffset.y < -pullingDetectFrom) {

           _draggingView = NO;

            NSLog(@"Pull Down");

      
        } else if (self.contentSize.height <= self.frame.size.height && self.contentOffset.y > pullingDetectFrom) {

            _draggingView = NO;

            NSLog(@"Pull Up");

       
        } else if (self.contentSize.height > self.frame.size.height &&

       self.contentSize.height-self.frame.size.height-self.contentOffset.y < -pullingDetectFrom) {

          _draggingView = NO;

           NSLog(@"Pull Up");

        }

}