ios - Xamarin Monotouch CustomCell 为空白

Question

我有以下 CustomCell:

using System;
using System.Drawing;
using MonoTouch.Foundation;
using MonoTouch.UIKit;

namespace Zurfers.Mobile.iOS
{
    public class CustomCell : UITableViewCell
    {
        UILabel headingLabel, subheadingLabel, priceLabel;
        UIImageView imageService;
        UIImageView star, star2, star3, star4, star5;
        public CustomCell (NSString cellId) : base (UITableViewCellStyle.Default, cellId)
        {
            imageService = new UIImageView();
            star   = new UIImageView();
            star2  = new UIImageView();
            star3  = new UIImageView();
            star4  = new UIImageView();
            star5  = new UIImageView();
            headingLabel = new UILabel(){
                Font = UIFont.FromName("Cochin-BoldItalic", 22f),
                TextColor = UIColor.FromRGB (127, 51, 0),
            };
            subheadingLabel = new UILabel(){
                Font = UIFont.FromName("Cochin-BoldItalic", 22f),
                TextColor = UIColor.FromRGB (127, 51, 0),
            };
            priceLabel = new UILabel(){
                Font = UIFont.FromName("Cochin-BoldItalic", 22f),
                TextColor = UIColor.FromRGB (127, 51, 0),
            };
        }

        public void UpdateCell (string title, string subtitle, string price, UIImage image)
        {
            imageService.Image = image;
            headingLabel.Text = title;
            subheadingLabel.Text = subtitle;
            priceLabel.Text = price;
        }

        public override void LayoutSubviews ()
        {
            base.LayoutSubviews ();
            imageService.Frame = new RectangleF(63, 5, 33, 33);
            headingLabel.Frame = new RectangleF(5, 4, 63, 25);
            subheadingLabel.Frame = new RectangleF(100, 18, 100, 20);
            priceLabel.Frame = new RectangleF(250, 18, 100, 20);
        }
    }
}

这是我的 TableSource:

using System;
using MonoTouch.Foundation;
using MonoTouch.UIKit;

namespace Zurfers.Mobile.iOS
{
    public class HotelTableSource : UITableViewSource
    {

        string[] tableItems;
        NSString cellIdentifier = new NSString("TableCell");

        public HotelTableSource (string[] items)
        {
            tableItems = items;
        }
        public override int RowsInSection (UITableView tableview, int section)
        {
            return tableItems.Length;
        }

        public override void RowSelected (UITableView tableView, NSIndexPath indexPath)
        {
            new UIAlertView("Row Selected", tableItems[indexPath.Row], null, "OK", null).Show();
            tableView.DeselectRow (indexPath, true); // normal iOS behaviour is to remove the blue highlight
        }

        public override UITableViewCell GetCell (UITableView tableView, MonoTouch.Foundation.NSIndexPath indexPath)
        {

            CustomCell cell = tableView.DequeueReusableCell(cellIdentifier) as CustomCell;
            if (cell == null)
                cell = new CustomCell(cellIdentifier);
            cell.UpdateCell(tableItems[indexPath.Row], tableItems[indexPath.Row], tableItems[indexPath.Row],
                            UIImage.FromFile (tableItems[indexPath.Row]) );
            return cell;


        }
    }
}

但是当我运行应用程序时，TableView 是空的。在我创建 TableView 之前，每个 CustomCell 都有一个值。

我做错了什么？

预先感谢您的帮助。

Answer 1

Cell 不仅应该包含控件，它们还应该放在它上面(或者放在它的 ContentView 上)。为添加到自定义单元格的任何控件调用 AddSubview:

ImageService = new UIImageView();
AddSubview(ImageService);

---

如果没有帮助，请尝试使用 UITableViewCell 的默认控件(TextLabel、DetailTextLabel、ImageView) 来显示一些数据。如果数据出现，则说明您的自定义 UITableViewCell 中仍然存在问题(错误的框架，空文本)，否则，问题出在 UITableViewSource(空数据)中。