C#Monotouch/Xamarin-UITableViewCell GetCell ImageView框架未调整大小

概述

我在UITableViewSource中有以下覆盖GetCell。 一切正常，但我想缩小单元格左侧的图像，而不必调整大小。 本质上，我只是想缩小框架，比如说，（30宽x 30高）…也许还可以把角落弄圆（类似于Whatsapp的开放式聊天列表）

问题

简单地将新的矩形应用于ImageView的Frame属性似乎不起作用

 if (tableItems[indexPath.Section].Items[indexPath.Row].ImageName != null)
                                {
//RESIZE IMAGE VIEW
cell.ImageView.Frame = new RectangleF(5,5,30,30);
                                        Console.WriteLine("Image name: " + tableItems[indexPath.Section].Items[indexPath.Row].ImageName);
                                        cell.ImageView.Image = UIImage.FromFile (tableItems[indexPath.Section].Items[indexPath.Row].Image); 
                                }

代码

 public override UITableViewCell GetCell (UITableView tableView, NSIndexPath indexPath)
            {
                    UITableViewCell cell = tableView.DequeueReusableCell (cellIdentifier);
                    Custom_UITableItem item = tableItems[indexPath.Section].Items[indexPath.Row];
                    var cellStyle = UITableViewCellStyle.Subtitle;

                    // if there are no cells to reuse, create a new one
                    if (cell == null) 
                    {
                            cell = new UITableViewCell (cellStyle, cellIdentifier);
                    }

                    try
                    {
                            if(cellAccessoryButtons.Count > 0)
                            {
                                    var cellAccessoryButton = cellAccessoryButtons [indexPath.Row];
                                    cell.AccessoryView = cellAccessoryButton;
                            }

                            cell.TextLabel.Text = tableItems[indexPath.Section].Items[indexPath.Row].Heading;
                            cell.TextLabel.Font = AppSettings.CellDetailTextLabelFontSize;
                            cell.TextLabel.LineBreakMode = UILineBreakMode.WordWrap;
                            cell.TextLabel.Lines = 2;
                            cell.DetailTextLabel.Text = tableItems[indexPath.Section].Items[indexPath.Row].SubHeading;
                            cell.DetailTextLabel.Font = AppSettings.CellDetailTextLabelFontSize;
                            cell.DetailTextLabel.LineBreakMode = UILineBreakMode.WordWrap;
                            cell.DetailTextLabel.Lines = 2;

                            if (tableItems[indexPath.Section].Items[indexPath.Row].ImageName != null)
                            {
//RESIZE IMAGE VIEW
cell.ImageView.Frame = new RectangleF(5,5,30,30);

                                    Console.WriteLine("Image name: " + tableItems[indexPath.Section].Items[indexPath.Row].ImageName);
                                    cell.ImageView.Image = UIImage.FromFile (tableItems[indexPath.Section].Items[indexPath.Row].Image); 
                            }

                            var trackUploadedDateFrame = new RectangleF (87, 55, 100, 20);
                            var trackUploadedDate = new UILabel (trackUploadedDateFrame);
                            trackUploadedDate.BackgroundColor = UIColor.Clear;
                            trackUploadedDate.Font = AppSettings.TrackUploadedDateFontSize;
                            trackUploadedDate.TextAlignment = UITextAlignment.Left;
                            trackUploadedDate.Text = "Uploaded: 16/10/13";
                            cell.AddSubview (trackUploadedDate);

                    }
                    catch(Exception ex) 
                    {
                            Console.WriteLine (ex.ToString ());
                    }

                    return cell;
            } 

简言之，“已经做到了，做到了”，让我告诉你定制股票UITableViewCell——特别是它的ImageView是一件非常痛苦的事情

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根据我的经验，通过子类化UITableViewCell（在代码中或使用IB的.xib中）来实现您的设计目标更容易，除非库存UITableViewCell的功能非常接近您自己的目标

使用以下函数调整图像大小，然后将其设置为表格单元格图像视图

 public UIImage ResizeImage(UIImage sourceImage, float width, float height)
        {
            UIGraphics.BeginImageContext(new SizeF(width, height));
            sourceImage.Draw(new RectangleF(0, 0, width, height));
            var resultImage = UIGraphics.GetImageFromCurrentImageContext();
            UIGraphics.EndImageContext();
            return resultImage;
        }

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我不会说这很难…任何可以在界面生成器中完成的事情都可以在代码中完成。我只是想知道是否需要为这个图像创建一个新的UIView，设置一个帧大小，添加图像，然后将这个新的UIView绑定到cell.ImageView内容…（虽然很遗憾我不在家，所以还不能测试这个选项）。