子控件超出父控件响应

// 事件传递给subview
- (UIView *)hitTest:(CGPoint)point withEvent:(UIEvent *)event
{
   CGPoint subviewP = [self convertPoint:point toView:_subview];

    if ([_subview pointInside:subviewP withEvent:event]) {
        return _subview;
    }else
    {
        return [super hitTest:point withEvent:event];
    }
}

// 手指移动
- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event
{
    UITouch *touch = [touches anyObject];

    CGPoint location =  [touch locationInView:self];

    CGPoint pre = [touch previousLocationInView:self];

    CGFloat offsetX = location.x - pre.x;
    CGFloat offsetY = location.y - pre.y;

    CGPoint center = self.center;
    center.x += offsetX;
    center.y += offsetY;

    self.transform = CGAffineTransformTranslate(self.transform, offsetX, offsetY);
}