如何立即响应scrollview上的子视图的手势

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-(void) touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
NSLog(@"PageScrollView Touch begin");

if(!self.dragging)
{
[[self nextResponder] touchesBegan:touches withEvent:event];
}

[super touchesBegan:touches withEvent:event];
}

- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event
{
NSLog(@"PageScrollView Touch Move");
if(!self.dragging)
{
[[self nextResponder] touchesMoved:touches withEvent:event];
}

[super touchesMoved:touches withEvent:event];
}

- (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event
{
NSLog(@"PageScrollView Touch End");
if(!self.dragging)
{
[[self nextResponder] touchesEnded:touches withEvent:event];
}

[super touchesEnded:touches withEvent:event];
}

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