Swift：使用prepareForSegue将UIView容器的高度设置为嵌入式UITableView的高度

我有一个UITableViewController嵌入在UIView容器中，这是在一个底部UIScrollView中UIViewController。这是情节提要中当前配置的屏幕截图。

在UITableView将包含选中的帖子回应。因为的高度和响应数UITableView将是可变的，所以我希望UIView容器的高度根据表的高度而变化。当前（不希望的）行为是UIView容器保持恒定的高度，并在UITableView高度大于容器的高度时滚动UIView。

The most viable method seems to be having the UITableViewController pass the height of the table to the UIViewController using prepareForSegue, and then set the UIView's height to that passed value. However, I can't seem to set a value with the height of the table until after prepareForSegue is run.

What Isn't Working

1. Set the identifier of the embed segue between the UIView and the UITableViewController to "embedSegue"

2. At the top of the the embedded UITableViewController class, create a variable to hold the height of the table:

   var tableHeight: CGFloat!
   

3. Still in the embedded UITableViewController, override viewDidLoad like so, printing passedHeight to the console for checking:

   override func viewDidLoad() {
       super.viewDidLoad()
   
       self.tableView.estimatedRowHeight = 68.0
       self.tableView.rowHeight = UITableViewAutomaticDimension
   
       self.tableHeight = self.tableView.contentSize.height
       print(tableHeight)
   }
   

4. In the UIViewController class that contains the UIView container, create a variable to hold the value passed from the UITableViewController:

   var viewHeight: CGFloat!
   

5. Still in the UIViewController, override prepareForSegue like so, setting viewHeight to the passed tableHeight value, and printing viewHeight to the console for checking:

   override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
       if segue.identifier == "embedSegue" {
           let responseTableView = segue.destinationViewController as! ResponseViewController
   
           self.viewHeight = responseTableView.tableHeight
   
           if viewHeight == nil {
               print("Nil")
           } else {
               print(viewHeight)
           }
       }
   }
   

6. When I run the app, viewHeight prints as Nil first, then tableHeight prints, which means prepareForSegue has run prior to tableHeight being set.

I have also tried other methods besides prepareForSegue, including calling various functions on the UIView container in viewDidLayoutSubviews() like:

• .sizeThatFits()
• .needsUpdateConstraints()
• .layoutIfNeeded()

However, the UIView container remains the same height as set in the storyboard.

As an epilogue, this is my first StackOverflow post, and I'm excited to be joining the community. Please do let me know if I can clarify my question. Thank you for taking the time.