Knitr和图标题在HTML中(Knitr and Figure Caption in HTML)

 亚历克斯， 
 
 我并不完全确定自己明白自己想要做什么，但是让我从我认为理解的地方对其进行刺探。 
 
 出于同样的理由（查看复杂性等），我经常在故事板中创建我的视图，然后从某个动作加载它们。 你可以做的是通过标识符来实例化视图控制器，如下所示： 
 
FancyViewController *controller = [[self storyboard] 
              instantiateViewControllerWithIdentifier:@"FancyViewController"];
 
 这假定你已经创建了一个叫做FancyViewController的UIViewController子类，并在storyboard中设置了你的视图控制器的类型。 
 
 现在，您可以将视图控制器显示在弹出窗口控制器中，或者将其推送到导航堆栈上。 你只需要确保你已经在故事板中为视图控制器设置了标识符。 
 
 
 此外，如果您使用popover控制器，并且每次触发操作时更新视图控制器属性，您都可能想要实例化视图控制器一次。 所以，如果它敲击触发弹出窗口的按钮，您的代码可能如下所示： 
 
- (IBAction)didTapButtonToShowFancyViewController:(id)sender
{
  if (![self fancyViewController])
  {
    // fancyViewContrller is a property of type FancyViewController *
    fancyViewController = [[[self storyboard]
          instantiateViewControllerWithIdentifier:@"FancyViewController"];

    // fancyViewPopoverController is also a property
    fancyViewPopoverController = [[UIPopoverController alloc] 
                  initWithContentViewController:fancyViewController];
  }

  // Perform setup on the fancy controller you want to do every
  // time the action gets triggered here. Do initialization in the if
  // block above.

  // Now display the popover from the sender's frame. I'm assuming the
  // sender is a UIButton.
  [fancyViewPopoverController presentPopoverFromRect:[sender valueForKey:@"frame"] 
                              inView:[self view] 
              permittedArrowDirections:UIPopoverArrowDirectionAny animated:YES];

}
 
 动态设置弹出窗口的“锚点”的唯一方法是使用显式操作，该操作调用presentPopoverFromRect:permittedArrowDirections:animated:而不是segue。 
 
 我希望有所帮助。 如果我误解了你想要做的事，请告诉我。 
 
 最好的祝福。 

Alex,
 
I'm not completely sure I understand what you're trying to do, but let me take a stab at it from what I think I understand.
 
For the same reason you cite (view complexity, etc.), I often build out my views in the storyboard and then load them from some action. What you can do is instantiate the view controller by identifier with something like this:
 
FancyViewController *controller = [[self storyboard] 
              instantiateViewControllerWithIdentifier:@"FancyViewController"];
 
This assumes you have created a UIViewController subclass called FancyViewController and have set the type for your view controller in the storyboard. 
 
Now, you can display the view controller in a popover controller or you can push it onto a navigation stack. You just need to make sure you've set the identifier for your view controller in the storyboard. 
 
 
Also, you'll probably want to instantiate your view controller once if you use a popover controller and just update the view controllers properties each time the action gets triggered. So, if it's tapping a button that triggers the popover, your code might look like this:
 
- (IBAction)didTapButtonToShowFancyViewController:(id)sender
{
  if (![self fancyViewController])
  {
    // fancyViewContrller is a property of type FancyViewController *
    fancyViewController = [[[self storyboard]
          instantiateViewControllerWithIdentifier:@"FancyViewController"];

    // fancyViewPopoverController is also a property
    fancyViewPopoverController = [[UIPopoverController alloc] 
                  initWithContentViewController:fancyViewController];
  }

  // Perform setup on the fancy controller you want to do every
  // time the action gets triggered here. Do initialization in the if
  // block above.

  // Now display the popover from the sender's frame. I'm assuming the
  // sender is a UIButton.
  [fancyViewPopoverController presentPopoverFromRect:[sender valueForKey:@"frame"] 
                              inView:[self view] 
              permittedArrowDirections:UIPopoverArrowDirectionAny animated:YES];

}
 
The only way to set the popover's "anchor" dynamically is to use an explicit action that calls presentPopoverFromRect:permittedArrowDirections:animated: instead of a segue.
 
I hope that helps. Let me know if I've misunderstood what you're trying to do.
 
Best regards.