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POiOS : Expandable list view not drawing newly added control
 

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  1. POiOS : Expandable list view not drawing newly added control
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    <p>I am trying to create an expandable list view in iOS using Xamarin with MvvmCross.</p> <p>The scenario is that I have a listview, and when a row in the listview is selected, it expands (animates) to reveal a collection view, loaded in via lazyloading.</p> <p>Here is the code I have so far:</p> <p><strong>Adapter :</strong> </p> <pre><code>public class MercatoAnimatedExpandableTableSource : MvxTableViewSource { private readonly string _key; private readonly List&lt;object&gt; items; private Dictionary&lt;object, bool&gt; expandableState = new Dictionary&lt;object, bool&gt;(); public MercatoAnimatedExpandableTableSource(UITableView tableView, IEnumerable&lt;object&gt; items, UINib nib, string key) : base(tableView) { _key = key; this.items = items.ToList(); this.items.ForEach(x =&gt; expandableState[x] = true); tableView.RegisterNibForCellReuse(nib, key); } protected override UITableViewCell GetOrCreateCellFor(UITableView tableView, NSIndexPath indexPath, object item) { var cell = tableView.DequeueReusableCell(_key); cell.Frame = new RectangleF(cell.Frame.X, cell.Frame.Y, cell.Frame.Width, GetHeightForRow(tableView, indexPath)); return cell; } public override void RowSelected(UITableView tableView, NSIndexPath indexPath) { base.RowSelected(tableView, indexPath); var isExpanded = expandableState[items[indexPath.Row]]; expandableState[items[indexPath.Row]] = !isExpanded; var row = this.GetCell(tableView, indexPath); (row as FamilysubgroupViewCell).ExpandCells(); tableView.ReloadRows(new[] { indexPath }, UITableViewRowAnimation.Automatic); } public override float GetHeightForRow(UITableView tableView, NSIndexPath indexPath) { var isExpanded = expandableState[items[indexPath.Row]]; if (isExpanded) { return 25; } return 400; } protected override object GetItemAt(NSIndexPath indexPath) { return items[indexPath.Row]; } } </code></pre> <p><strong>Cell :</strong> </p> <pre><code> public FamilySubgroupViewCell (IntPtr handle) : base (handle) { this.DelayBind(() =&gt; { this.FamilyCollectionViewContainer.BackgroundColor = UIColor.Blue; var bindingset = this.CreateBindingSet&lt;FamilySubgroupViewCell, FamilySubTypeViewModel&gt;(); bindingset.Bind(this.FamilyGroupTitleLabel).To(x =&gt; x.FamilySubType.FamilySubGroupDescription); bindingset.Bind(this.FamilyGroupDescLabel).To(x =&gt; x.FamilySubType.FamilySubGroupDetail); bindingset.Apply(); }); } public void ExpandCells(Action onUpdate) { var context = this.DataContext as FamilySubTypeViewModel; context.PopulateAndRun(() =&gt; { Debug.WriteLine("Populating Models complete : now showing cells"); var collection = new FamilySubGroupModelsCollection(); collection.ViewModel = context; Debug.WriteLine("FamilySubGroupCell : Showing {0} Items", context.FamilyModels.Count); this.FamilyCollectionViewContainer.Add(collection.View); if (onUpdate != null) onUpdate(); }); } </code></pre> <p><strong>Issue</strong></p> <p>So when a cell is selected, it flips the 'isExpanded' property which gives it a new height - that works fine. The cell is then sent a message to 'expand' the cell, which in turn loads a new collection and adds it to the view (via View outlet).</p> <p>However, the collection is never re-rendered on the view. It populates fine, adds to the view but it is never actually visible on the newly expanded cell. If i load it in when the cell is initially created in the DelayBind() method (ie - no lazy loading) then it works ok.</p> <p>Have tried things like redrawing the cell </p> <pre><code>this.Draw(this.Bounds); </code></pre> <p>after the collection was added to the view, but to no avail.</p> <p>What am I doing wrong?</p>
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    1. USPatrick McCurley
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      1. POiOS : Expandable list view not drawing newly added control
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