刷新NIB /自定义tableViewCell的子视图

Question

我想将子视图NIB /自定义tableViewCell弹出到视图控制器。问题是当我单击地图点时，弹出窗口与最新的点击结果重叠。我希望子视图刷新而不是继续弹出一个新的。

 //Pop up map details
    GLfloat topOffset = self.view.frame.size.height/3.6;
    UIView *modalView = [[[NSBundle mainBundle] loadNibNamed:@"LocateUsDetailsTableViewCell" owner:self options:nil] objectAtIndex:0];
    [modalView setFrame:CGRectMake(0, 0, CGRectGetWidth(self.view.bounds), topOffset)];
    [self.view addSubview:modalView]; //reloads the view from the nib
    [UIView animateWithDuration:0 animations:^{
        CGRect currentRect = modalView.frame;
        currentRect.origin.y = self.view.frame.size.height/1.35;
        [modalView setAlpha:1];
        [modalView setFrame:currentRect];
        [self.view bringSubviewToFront:modalView];
    }];