1.

 -(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {

    [[self nextResponder] touchesBegan:touches withEvent:event];

    [super touchesBegan:touches withEvent:event];

}

 -(void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event {

    [[self nextResponder] touchesMoved:touches withEvent:event];

    [super touchesMoved:touches withEvent:event];

}

 -(void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event {

    [[self nextResponder] touchesEnded:touches withEvent:event];

    [super touchesEnded:touches withEvent:event];

}

2.hittest

- (UIView *)hitTest:(CGPoint)point withEvent:(UIEvent *)event

{

    UIView *hitView = [super hitTest:point withEvent:event];

    if (hitView == self)

    {

        return nil;

    }

    else

    {

        return hitView;

    }  

}

http://blog.csdn.net/reylen/article/details/45093037