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我已經子類UITableView與所需的方法重寫在子類中填充表視圖。但是，NumberOfSections被調用時，不會調用NumberOfRowsInSection。UITableView子類一些重寫的方法不被稱爲
下面的代碼來自Xamarin項目，但這與其等同的本地版本沒有什麼不同，方法名稱略有不同。
partial class ShootsTable : UITableView, IUISearchResultsUpdating, IUISearchBarDelegate
{
public bool History { get; set; }
public UIViewController Parent { get; set; }
private Bootleg.API.Event[] Events { get; set; }
private List<nint> ExpandedSections { get; }
public ShootsTable (IntPtr handle) : base (handle)
{
ExpandedSections = new List<nint>();
SetEvents();
}
private void SetEvents()
{
if (History) {
Events = AppDelegate.Api.GetShootHistory().ToArray();
} else {
Events = AppDelegate.Api.MyEvents.ToArray();
}
}
private void AddRefreshControl()
{
var refreshControl = new UIRefreshControl();
refreshControl.AttributedTitle = new NSAttributedString ("Pull to refresh");
refreshControl.AddTarget (async delegate(object sender, EventArgs e) {
await AppDelegate.Api.RefreshEvents();
SetEvents();
ReloadData();
refreshControl.EndRefreshing();
}, UIControlEvent.ValueChanged);
AddSubview (refreshControl);
}
private void AddSearchControl()
{
var searchControl = new UISearchController (Parent);
searchControl.SearchResultsUpdater = this;
searchControl.SearchBar.Delegate = this;
TableHeaderView = searchControl.SearchBar;
}
public void UpdateSearchResultsForSearchController (UISearchController searchController)
{
SetEvents();
Events = Events.Where (e => e.name.Contains (searchController.SearchBar.Text)).ToArray();
ReloadData();
}
public override nint NumberOfSections()
{
if (Events != null && Events.Length > 0)
{
SeparatorStyle = UITableViewCellSeparatorStyle.SingleLine;
return Events.Length;
}
var label = new UILabel (new CGRect (Bounds.X, Bounds.Y, Bounds.Size.Width, Bounds.Size.Height));
label.Text = History ? "You have not contributed to any shoots yet." : "No shoots available.";
label.Lines = 2;
label.TextAlignment = UITextAlignment.Center;
BackgroundView = label;
SeparatorStyle = UITableViewCellSeparatorStyle.None;
return 0;
}
public override nint NumberOfRowsInSection (nint section)
{
var e = Events[section];
if (e.group == null)
{
return 1;
}
return ExpandedSections.Contains (section) ? e.events.Count : 0;
}
[Export ("tableView:heightForHeaderInSection:")]
public System.nfloat GetHeightForHeader (UIKit.UITableView tableView, System.nint section)
{
return Events [section].group == null ? 0 : tableView.SectionHeaderHeight;
}
[Export ("tableView:viewForHeaderInSection:")]
public UIKit.UIView GetViewForHeader (UIKit.UITableView tableView, System.nint section)
{
var e = Events [section];
if (e.group == null)
{
return null;
}
var cell = (ShootGroupCell) tableView.DequeueReusableCell (ShootGroupCell.Key);
cell.Event = e;
cell.AddGestureRecognizer (new UITapGestureRecognizer(() => {
if (ExpandedSections.Contains(section))
{
ExpandedSections.Remove(section);
tableView.ReloadSections(new NSIndexSet((nuint) section), UITableViewRowAnimation.Automatic);
} else {
ExpandedSections.Add(section);
tableView.ReloadSections(new NSIndexSet((nuint) section), UITableViewRowAnimation.Automatic);
}
}));
return cell.ContentView;
}
public override UITableViewCell CellAt (NSIndexPath ns)
{
var e = Events[ns.Section];
e = e.group == null ? e : e.events[ns.Row];
if (History) {
var cell = (ShootCell)DequeueReusableCell (ShootCell.Key);
cell.Event = e;
cell.Parent = Parent;
return cell;
} else {
var cell = (ShootJoinCell) DequeueReusableCell (ShootJoinCell.Key);
cell.Event = e;
return cell;
}
}
[Export ("tableView:heightForRowAtIndexPath:")]
public System.nfloat GetHeightForRow (UIKit.UITableView tableView, Foundation.NSIndexPath indexPath)
{
return Events [indexPath.Section].group == null || ExpandedSections.Contains (indexPath.Section) ? tableView.RowHeight : 0;
}
[Export ("tableView:didSelectRowAtIndexPath:")]
public async void RowSelected (UIKit.UITableView tableView, Foundation.NSIndexPath indexPath)
{
if (!History)
{
var e = Events [indexPath.Section];
if (e.group != null) {
e = e.events [indexPath.Row];
}
MBHUDView.HudWithBody ("Connecting Event...", MBAlertViewHUDType.ActivityIndicator, 0, true);
await AppDelegate.Api.ConnectToEvent (e, false);
MBHUDView.DismissCurrentHUD();
if (AppDelegate.Api.CurrentEvent.id != e.id)
{
var alert = UIAlertController.Create ("Confirm", "This event requires you to confirm you wish to join.", UIAlertControllerStyle.Alert);
alert.AddAction(UIAlertAction.Create("Join", UIAlertActionStyle.Default, async delegate {
MBHUDView.HudWithBody ("Connecting Event...", MBAlertViewHUDType.ActivityIndicator, 0, true);
await AppDelegate.Api.ConnectToEvent (e, true);
MBHUDView.DismissCurrentHUD();
e = AppDelegate.Api.CurrentEvent;
DialogHelper.PermissionsDialog (e, delegate {
Parent.PerformSegue("phasesSegue", tableView);
}, null, Parent);
}));
alert.AddAction(UIAlertAction.Create("Cancel", UIAlertActionStyle.Cancel, null));
Parent.PresentViewController (alert, true, null);
}
else
{
e = AppDelegate.Api.CurrentEvent;
DialogHelper.PermissionsDialog (e, delegate {
Parent.PerformSegue("phasesSegue", tableView);
}, null, Parent);
}
}
}
現在，我一直在尋找一些可能的解決方案但它似乎相當罕見的子類的UITableView與廣大的解決方案根本是沒有正確設置委託或數據源。我也看到了這個問題的SO解決方案，僅僅是因爲TableView不在視圖中，因此不需要調用委託方法，但事實並非如此。
我不需要設置委託方法，因爲我繼承了UITableView本身，只需重寫內置方法就足夠了。在故事板中，我將課程設置爲我的自定義課程ShootsTable。
有沒有人有任何想法？
在此先感謝。