Xamarin iOS：代码添加至UIStackView的UIView无法隐藏求助

Hey there! Since you're new to Xamarin.iOS and Xcode, let's break down this issue and fix it step by step—this is a common gotcha with stack views and table view cells, so you're not alone!

核心问题分析 #

Your main issues are twofold: maintaining a reliable list of your input views, and ensuring hidden views behave correctly within the UIStackView. Let's tackle each part.

1. 正确维护输入视图的引用列表 #

First off, you need a persistent list in your table view cell class to track all the input views you add—this ensures you can always reference any view later to hide it.

Step 1: Define the list in your cell class

Add a private list property to your cell to store all input views:

// Inside your TableViewCell subclass
private List<UIView> _allInputViews = new List<UIView>();

Step 2: Initialize the list with your default view

In AwakeFromNib, grab the default input view from your stack view and add it to the list:

public override void AwakeFromNib()
{
    base.AwakeFromNib();
    
    // Get the default input view already in the stack view
    var defaultInputView = YourStackView.ArrangedSubviews.FirstOrDefault();
    if (defaultInputView != null)
    {
        _allInputViews.Add(defaultInputView);
    }
}

Step 3: Add new views properly

When creating a new input view, make sure to add it to both the stack view (as an arranged subview) and your list:

private void AddNewInputView()
{
    // Load your input view from its XIB (replace "InputView" with your XIB name)
    var newInputView = NSBundle.MainBundle.LoadNib("InputView", this, null).FirstOrDefault() as UIView;
    if (newInputView == null) return;

    // Match the size of existing views to keep alignment
    newInputView.TranslatesAutoresizingMaskIntoConstraints = false;
    newInputView.WidthAnchor.ConstraintEqualTo(_allInputViews.First().WidthAnchor).Active = true;
    newInputView.HeightAnchor.ConstraintEqualTo(_allInputViews.First().HeightAnchor).Active = true;

    // Add to stack view (critical: use AddArrangedSubview, not AddSubview!)
    YourStackView.AddArrangedSubview(newInputView);
    // Add to your tracking list
    _allInputViews.Add(newInputView);
}

Important: Always use AddArrangedSubview for stack view children—if you use AddSubview, the stack view won't manage the view's layout or hidden state.

2. 实现正确的隐藏逻辑 #

Now that you have a reliable list, hiding a view is straightforward. Just target the view from the list and update its Hidden property, then trigger a layout refresh:

// Example: Hide the last added input view
private void HideLastInputView()
{
    if (_allInputViews.Count <= 1) return; // Don't hide the default view
    
    var viewToHide = _allInputViews.Last();
    viewToHide.Hidden = true;
    
    // Force the stack view to update its layout
    YourStackView.LayoutIfNeeded();
}

// Or hide a view by index
private void HideInputViewAtIndex(int index)
{
    if (index >= 0 && index < _allInputViews.Count)
    {
        _allInputViews[index].Hidden = true;
        YourStackView.LayoutIfNeeded();
    }
}

3. 处理Table View Cell复用（关键！） #

Table view cells get reused, so you need to reset their state when they're recycled. Add this to your cell class to avoid leftover hidden views or duplicate entries:

public override void PrepareForReuse()
{
    base.PrepareForReuse();
    
    // Clear the tracking list
    _allInputViews.Clear();
    
    // Remove all arranged subviews from the stack view
    foreach (var subview in YourStackView.ArrangedSubviews.ToList())
    {
        YourStackView.RemoveArrangedSubview(subview);
        subview.RemoveFromSuperview();
    }
    
    // Re-add the default input view to reset the cell
    var defaultInputView = NSBundle.MainBundle.LoadNib("InputView", this, null).FirstOrDefault() as UIView;
    if (defaultInputView != null)
    {
        YourStackView.AddArrangedSubview(defaultInputView);
        _allInputViews.Add(defaultInputView);
    }
}

常见排查点 #

If you still have issues, check these:

• Did you forget to set TranslatesAutoresizingMaskIntoConstraints = false on new views? This breaks auto layout.
• Are you accidentally hiding the stack view itself instead of the child view?
• Did you verify that the view reference in your list is the same one in the stack view? Print debug logs to confirm.

内容的提问来源于stack exchange，提问作者Srinidhi Ram